Initial Commit

packages/persistence/database/README.md

@@ -0,0 +1,17 @@
+# `database`
+
+Database adapters, migrations, seeding, and SQLite support.
+
+<!-- begin:auto-docs -->
+## Packages in `database`
+
+5 packages.
+
+| Package | Description |
+|---|---|
+| [`@suaveplan/db`](./db/README.md) | Universal relational database adapter interface for Suaveplan. Provides the `DatabaseAdapter` contract (extending `DatabaseLike` from `@suaveplan/types`), inje… |
+| [`@suaveplan/db-sqlite`](./db-sqlite/README.md) | Universal SQLite adapter for Suaveplan. Runs on `bun:sqlite` on the Bun server and `@sqlite.org/sqlite-wasm` (Web Worker) in the browser, unified behind a sing… |
+| [`@suaveplan/migration`](./migration/README.md) | Database-agnostic schema migration runner with ledger tracking, checksum validation, dry-run reporting, distributed locking, event bus integration, and OTel in… |
+| [`@suaveplan/seed`](./seed/README.md) | Universal declarative database seeding and fixture framework. Define seed data once, let the runner handle dependency ordering, environment filtering, ide… |
+| [`@suaveplan/surrealdb`](./surrealdb/README.md) | Universal SurrealDB client wrapper for Suaveplan. Implements `@suaveplan/db`'s `DatabaseAdapter` interface with connection lifecycle management, typed CRUD, sc… |
+<!-- end:auto-docs -->

packages/persistence/database/_intro.md

@@ -0,0 +1 @@
+Database adapters, migrations, seeding, and SQLite support.

packages/persistence/database/db-sqlite/README.md

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+# @suaveplan/db-sqlite - Universal SQLite adapter for Suaveplan: bun:sqlite on the Bun server, @sqlite.org/sqlite-wasm in the browser, unified behind a Drizzle-ORM surface with LRU prepared-statement cache, forward-only migration runner, OTel instrumentation, and structured SQLITE.* error codes.
+
+## Summary
+
+Universal SQLite adapter for Suaveplan. Runs on `bun:sqlite` on the Bun server and `@sqlite.org/sqlite-wasm` (Web Worker) in the browser, unified behind a single `SqliteAdapter` that implements `DatabaseAdapter` from `@suaveplan/db`. Includes an LRU prepared-statement cache (128 entries by default), a forward-only ledger-tracked `MigrationRunner` with dry-run support, OpenTelemetry span instrumentation, structured `SQLITE_*` error codes, and a `./unsafe` subpath for raw queries.
+
+<!-- begin:auto-docs -->
+## Documentation tree
+
+- [adapter](./src/adapter/adapter.md) — <!-- begin:auto-docs --> _(no submodules)_ <!-- end:auto-docs --> - adapter.wasm — Browser-runtime entry point for the……
+  - [adapter.bun](./src/adapter/adapter.bun.md) — Bun-runtime entry point for the `./adapter` conditional export in `@suaveplan/db-sqlite`. When a bundler or the Bun run…
+  - [adapter](./src/adapter/adapter.md) — <!-- begin:auto-docs --> _(no submodules)_ <!-- end:auto-docs --> - adapter.wasm — Browser-runtime entry point for the……
+  - [adapter.wasm](./src/adapter/adapter.wasm.md) — Browser-runtime entry point for the `./adapter` conditional export in `@suaveplan/db-sqlite`. When a browser bundler re…
+- [cache](./src/cache/cache.md) — <!-- begin:auto-docs --> _(no submodules)_ <!-- end:auto-docs -->
+  - [cache](./src/cache/cache.md) — <!-- begin:auto-docs --> _(no submodules)_ <!-- end:auto-docs -->
+- [conformance](./src/conformance/conformance-suite.md) — <!-- begin:auto-docs --> _(no submodules)_ <!-- end:auto-docs -->
+  - [conformance-suite](./src/conformance/conformance-suite.md) — <!-- begin:auto-docs --> _(no submodules)_ <!-- end:auto-docs -->
+- [connection](./src/connection/connection.md) — <!-- begin:auto-docs --> _(no submodules)_ <!-- end:auto-docs -->
+  - [connection](./src/connection/connection.md) — <!-- begin:auto-docs --> _(no submodules)_ <!-- end:auto-docs -->
+- [bun-driver](./src/drivers/bun-driver.md) — Provides `createBunDriver`, the server-side SQLite driver for `@suaveplan/db-sqlite`. It dynamically imports `bun:sqlit…
+- [wasm-driver](./src/drivers/wasm-driver.md) — Provides `createWasmDriver`, the browser-side SQLite driver for `@suaveplan/db-sqlite`. It spawns a Web Worker running…
+- [wasm-worker](./src/drivers/wasm-worker.md) — Web Worker implementation for the WASM SQLite driver. This module runs inside a dedicated worker thread created by `cre…
+- [errors](./src/errors/errors.md) — <!-- begin:auto-docs --> _(no submodules)_ <!-- end:auto-docs -->
+  - [errors](./src/errors/errors.md) — <!-- begin:auto-docs --> _(no submodules)_ <!-- end:auto-docs -->
+- [migration](./src/migration/migration.md) — <!-- begin:auto-docs --> _(no submodules)_ <!-- end:auto-docs -->
+  - [migration](./src/migration/migration.md) — <!-- begin:auto-docs --> _(no submodules)_ <!-- end:auto-docs -->
+- [otel](./src/otel/otel.md) — <!-- begin:auto-docs --> _(no submodules)_ <!-- end:auto-docs -->
+  - [otel](./src/otel/otel.md) — <!-- begin:auto-docs --> _(no submodules)_ <!-- end:auto-docs -->
+- [schemas](./src/schemas/schemas.md) — <!-- begin:auto-docs --> _(no submodules)_ <!-- end:auto-docs -->
+  - [schemas](./src/schemas/schemas.md) — <!-- begin:auto-docs --> _(no submodules)_ <!-- end:auto-docs -->
+- [unsafe](./src/unsafe/unsafe.md) — <!-- begin:auto-docs --> _(no submodules)_ <!-- end:auto-docs -->
+  - [unsafe](./src/unsafe/unsafe.md) — <!-- begin:auto-docs --> _(no submodules)_ <!-- end:auto-docs -->
+<!-- end:auto-docs --> - adapter.wasm — Browser-runtime entry point for the……
+  - [adapter.bun](./src/adapter/adapter.bun.md) — Bun-runtime entry point for the `./adapter` conditional export in `@suaveplan/db-sqlite`. When a bundler or the Bun run…
+  - [adapter](./src/adapter/adapter.md) — <!-- begin:auto-docs --> _(no submodules)_- adapter.wasm — Browser-runtime entry point for the……
+  - [adapter.wasm](./src/adapter/adapter.wasm.md) — Browser-runtime entry point for the `./adapter` conditional export in `@suaveplan/db-sqlite`. When a browser bundler re…
+- [cache](./src/cache/cache.md) — <!-- begin:auto-docs --> _(no submodules)_- [cache](./src/cache/cache.md) — <!-- begin:auto-docs --> _(no submodules)_- [conformance](./src/conformance/conformance-suite.md) — <!-- begin:auto-docs --> _(no submodules)_- [conformance-suite](./src/conformance/conformance-suite.md) — <!-- begin:auto-docs --> _(no submodules)_- [connection](./src/connection/connection.md) — <!-- begin:auto-docs --> _(no submodules)_- [connection](./src/connection/connection.md) — <!-- begin:auto-docs --> _(no submodules)_- [bun-driver](./src/drivers/bun-driver.md) — Provides `createBunDriver`, the server-side SQLite driver for `@suaveplan/db-sqlite`. It dynamically imports `bun:sqlit…
+- [wasm-driver](./src/drivers/wasm-driver.md) — Provides `createWasmDriver`, the browser-side SQLite driver for `@suaveplan/db-sqlite`. It spawns a Web Worker running…
+- [wasm-worker](./src/drivers/wasm-worker.md) — Web Worker implementation for the WASM SQLite driver. This module runs inside a dedicated worker thread created by `cre…
+- [errors](./src/errors/errors.md) — <!-- begin:auto-docs --> _(no submodules)_- [errors](./src/errors/errors.md) — <!-- begin:auto-docs --> _(no submodules)_- [migration](./src/migration/migration.md) — <!-- begin:auto-docs --> _(no submodules)_- [migration](./src/migration/migration.md) — <!-- begin:auto-docs --> _(no submodules)_- [otel](./src/otel/otel.md) — <!-- begin:auto-docs --> _(no submodules)_- [otel](./src/otel/otel.md) — <!-- begin:auto-docs --> _(no submodules)_- [schemas](./src/schemas/schemas.md) — <!-- begin:auto-docs --> _(no submodules)_- [schemas](./src/schemas/schemas.md) — <!-- begin:auto-docs --> _(no submodules)_- [unsafe](./src/unsafe/unsafe.md) — <!-- begin:auto-docs --> _(no submodules)_- [unsafe](./src/unsafe/unsafe.md) — <!-- begin:auto-docs --> _(no submodules)_- adapter.wasm — Browser-runtime entry point for the……
+
+- [adapter.bun](./src/adapter/adapter.bun.md) — Bun-runtime entry point for the `./adapter` conditional export in `@suaveplan/db-sqlite`. When a bundler or the Bun run…
+- [adapter](./src/adapter/adapter.md) — <!-- begin:auto-docs --> _(no submodules)_- adapter.wasm — Browser-runtime entry point for the……
+- [adapter.wasm](./src/adapter/adapter.wasm.md) — Browser-runtime entry point for the `./adapter` conditional export in `@suaveplan/db-sqlite`. When a browser bundler re…
+- [cache](./src/cache/cache.md) — <!-- begin:auto-docs --> _(no submodules)_- [cache](./src/cache/cache.md) — <!-- begin:auto-docs --> _(no submodules)_- [conformance](./src/conformance/conformance-suite.md) — <!-- begin:auto-docs --> _(no submodules)_- [conformance-suite](./src/conformance/conformance-suite.md) — <!-- begin:auto-docs --> _(no submodules)_- [connection](./src/connection/connection.md) — <!-- begin:auto-docs --> _(no submodules)_- [connection](./src/connection/connection.md) — <!-- begin:auto-docs --> _(no submodules)_- [bun-driver](./src/drivers/bun-driver.md) — Provides `createBunDriver`, the server-side SQLite driver for `@suaveplan/db-sqlite`. It dynamically imports `bun:sqlit…
+- [wasm-driver](./src/drivers/wasm-driver.md) — Provides `createWasmDriver`, the browser-side SQLite driver for `@suaveplan/db-sqlite`. It spawns a Web Worker running…
+- [wasm-worker](./src/drivers/wasm-worker.md) — Web Worker implementation for the WASM SQLite driver. This module runs inside a dedicated worker thread created by `cre…
+- [errors](./src/errors/errors.md) — <!-- begin:auto-docs --> _(no submodules)_- [errors](./src/errors/errors.md) — <!-- begin:auto-docs --> _(no submodules)_- [migration](./src/migration/migration.md) — <!-- begin:auto-docs --> _(no submodules)_- [migration](./src/migration/migration.md) — <!-- begin:auto-docs --> _(no submodules)_- [otel](./src/otel/otel.md) — <!-- begin:auto-docs --> _(no submodules)_- [otel](./src/otel/otel.md) — <!-- begin:auto-docs --> _(no submodules)_- [schemas](./src/schemas/schemas.md) — <!-- begin:auto-docs --> _(no submodules)_- [schemas](./src/schemas/schemas.md) — <!-- begin:auto-docs --> _(no submodules)_- [unsafe](./src/unsafe/unsafe.md) — <!-- begin:auto-docs --> _(no submodules)_- [unsafe](./src/unsafe/unsafe.md) — <!-- begin:auto-docs --> _(no submodules)_- adapter.wasm — Browser-runtime entry point for the…
+
+- [adapter.bun](./src/adapter/adapter.bun.md) — Bun-runtime entry point for the `./adapter` conditional export in `@suaveplan/db-sqlite`. When a bundler or the Bun run…
+- [adapter](./src/adapter/adapter.md) — <!-- begin:auto-docs --> _(no submodules)_- adapter.wasm — Browser-runtime entry point for the…
+- [adapter.wasm](./src/adapter/adapter.wasm.md) — Browser-runtime entry point for the `./adapter` conditional export in `@suaveplan/db-sqlite`. When a browser bundler re…
+- [cache](./src/cache/cache.md) — <!-- begin:auto-docs --> _(no submodules)_- [cache](./src/cache/cache.md) — <!-- begin:auto-docs --> _(no submodules)_- [conformance](./src/conformance/conformance-suite.md) — <!-- begin:auto-docs --> _(no submodules)_- [conformance-suite](./src/conformance/conformance-suite.md) — <!-- begin:auto-docs --> _(no submodules)_- [connection](./src/connection/connection.md) — <!-- begin:auto-docs --> _(no submodules)_- [connection](./src/connection/connection.md) — <!-- begin:auto-docs --> _(no submodules)_- [bun-driver](./src/drivers/bun-driver.md) — Provides `createBunDriver`, the server-side SQLite driver for `@suaveplan/db-sqlite`. It dynamically imports `bun:sqlit…
+- [wasm-driver](./src/drivers/wasm-driver.md) — Provides `createWasmDriver`, the browser-side SQLite driver for `@suaveplan/db-sqlite`. It spawns a Web Worker running…
+- [wasm-worker](./src/drivers/wasm-worker.md) — Web Worker implementation for the WASM SQLite driver. This module runs inside a dedicated worker thread created by `cre…
+- [errors](./src/errors/errors.md) — <!-- begin:auto-docs --> _(no submodules)_- [errors](./src/errors/errors.md) — <!-- begin:auto-docs --> _(no submodules)_- [migration](./src/migration/migration.md) — <!-- begin:auto-docs --> _(no submodules)_- [migration](./src/migration/migration.md) — <!-- begin:auto-docs --> _(no submodules)_- [otel](./src/otel/otel.md) — <!-- begin:auto-docs --> _(no submodules)_- [otel](./src/otel/otel.md) — <!-- begin:auto-docs --> _(no submodules)_- [schemas](./src/schemas/schemas.md) — <!-- begin:auto-docs --> _(no submodules)_- [schemas](./src/schemas/schemas.md) — <!-- begin:auto-docs --> _(no submodules)_- [unsafe](./src/unsafe/unsafe.md) — <!-- begin:auto-docs --> _(no submodules)_- [unsafe](./src/unsafe/unsafe.md) — <!-- begin:auto-docs --> _(no submodules)_- [adapter.bun](./src/adapter/adapter.bun.md) — Bun-runtime entry point for the `./adapter` conditional export in `@suaveplan/db-sqlite`. When a bundler or the Bun run…
+- [adapter](./src/adapter/adapter.md) — <!-- begin:auto-docs --> _(no submodules)_- [adapter.wasm](./src/adapter/adapter.wasm.md) — Browser-runtime entry point for the `./adapter` conditional export in `@suaveplan/db-sqlite`. When a browser bundler re…
+- [cache](./src/cache/cache.md) — <!-- begin:auto-docs --> _(no submodules)_  - [cache](./src/cache/cache.md) — <!-- begin:auto-docs --> _(no submodules)_- [conformance](./src/conformance/conformance-suite.md) — <!-- begin:auto-docs --> _(no submodules)_  - [conformance-suite](./src/conformance/conformance-suite.md) — <!-- begin:auto-docs --> _(no submodules)_- [connection](./src/connection/connection.md) — <!-- begin:auto-docs --> _(no submodules)_  - [connection](./src/connection/connection.md) — <!-- begin:auto-docs --> _(no submodules)_- [bun-driver](./src/drivers/bun-driver.md) — Provides `createBunDriver`, the server-side SQLite driver for `@suaveplan/db-sqlite`. It dynamically imports `bun:sqlit…
+- [wasm-driver](./src/drivers/wasm-driver.md) — Provides `createWasmDriver`, the browser-side SQLite driver for `@suaveplan/db-sqlite`. It spawns a Web Worker running…
+- [wasm-worker](./src/drivers/wasm-worker.md) — Web Worker implementation for the WASM SQLite driver. This module runs inside a dedicated worker thread created by `cre…
+- [errors](./src/errors/errors.md) — <!-- begin:auto-docs --> _(no submodules)_  - [errors](./src/errors/errors.md) — <!-- begin:auto-docs --> _(no submodules)_- [migration](./src/migration/migration.md) — <!-- begin:auto-docs --> _(no submodules)_  - [migration](./src/migration/migration.md) — <!-- begin:auto-docs --> _(no submodules)_- [otel](./src/otel/otel.md) — <!-- begin:auto-docs --> _(no submodules)_  - [otel](./src/otel/otel.md) — <!-- begin:auto-docs --> _(no submodules)_- [schemas](./src/schemas/schemas.md) — <!-- begin:auto-docs --> _(no submodules)_  - [schemas](./src/schemas/schemas.md) — <!-- begin:auto-docs --> _(no submodules)_- [unsafe](./src/unsafe/unsafe.md) — <!-- begin:auto-docs --> _(no submodules)_  - [unsafe](./src/unsafe/unsafe.md) — <!-- begin:auto-docs --> _(no submodules)_
+## Install
+
+```bash
+bun add @suaveplan/db-sqlite
+```
+
+## Quick start
+
+```ts
+import { createSqliteAdapter } from "@suaveplan/db-sqlite/adapter";
+
+const db = await createSqliteAdapter({ url: ":memory:" });
+
+await db.exec(`
+    CREATE TABLE users (
+        id TEXT PRIMARY KEY,
+        email TEXT NOT NULL
+    );
+`);
+
+await db.run("INSERT INTO users (id, email) VALUES (?, ?)", [
+    "user-123",
+    "alice@example.com",
+]);
+
+const rows = await db.all<{ id: string; email: string }>(
+    "SELECT id, email FROM users WHERE id = ?",
+    ["user-123"],
+);
+
+await db.close();
+```
+
+## Modules
+
+- [Adapter (universal)](./src/adapter/adapter.md) — `SqliteAdapter`, `createSqliteAdapter`, runtime selection
+- [Adapter (Bun)](./src/adapter/adapter.bun.md) — `bun:sqlite` driver binding
+- [Adapter (WASM)](./src/adapter/adapter.wasm.md) — browser/Worker `@sqlite.org/sqlite-wasm` binding
+- [Cache](./src/cache/cache.md) — `PreparedStatementCache` (LRU)
+- [Connection](./src/connection/connection.md) — connection helpers and singleton management
+- [Bun driver](./src/drivers/bun-driver.md) — low-level Bun SQLite driver
+- [WASM driver](./src/drivers/wasm-driver.md) — low-level WASM SQLite driver
+- [WASM worker](./src/drivers/wasm-worker.md) — Web Worker host for WASM driver
+- [Errors](./src/errors/errors.md) — `SqliteError`, `SQLITE_*` codes
+- [Migration](./src/migration/migration.md) — `MigrationRunner`, forward-only migration ledger
+- [OTel](./src/otel/otel.md) — span and metric instrumentation
+- [Schemas](./src/schemas/schemas.md) — Zod-validated config types
+- [Conformance](./src/conformance/conformance-suite.md) — shared `DatabaseAdapter` conformance suite
+- [Unsafe](./src/unsafe/unsafe.md) — `./unsafe` subpath for raw queries

packages/persistence/database/db-sqlite/package.json

@@ -0,0 +1,123 @@
+{
+  "name": "@suaveplan/db-sqlite",
+  "version": "0.1.0",
+  "type": "module",
+  "sideEffects": false,
+  "description": "Universal SQLite adapter for the genesis monorepo: bun:sqlite on the Bun server, @sqlite.org/sqlite-wasm in the browser, unified behind a Drizzle-ORM surface with LRU prepared-statement cache, forward-only migration runner, OTel instrumentation, and structured SQLITE.* error codes.",
+  "license": "MIT",
+  "author": "Suaveplan Team",
+  "main": "./dist/index.js",
+  "module": "./dist/index.js",
+  "types": "./dist/index.d.ts",
+  "exports": {
+    "./package.json": "./package.json",
+    ".": {
+      "import": {
+        "types": "./dist/index.d.ts",
+        "default": "./dist/index.js"
+      }
+    },
+    "./adapter": {
+      "bun": {
+        "types": "./dist/adapter/adapter.bun.d.ts",
+        "default": "./dist/adapter/adapter.bun.js"
+      },
+      "browser": {
+        "types": "./dist/adapter/adapter.wasm.d.ts",
+        "default": "./dist/adapter/adapter.wasm.js"
+      },
+      "default": {
+        "types": "./dist/adapter/adapter.bun.d.ts",
+        "default": "./dist/adapter/adapter.bun.js"
+      }
+    },
+    "./unsafe": {
+      "import": {
+        "types": "./dist/unsafe/index.d.ts",
+        "default": "./dist/unsafe/index.js"
+      }
+    },
+    "./errors/errors": {
+      "import": {
+        "types": "./dist/errors/errors.d.ts",
+        "default": "./dist/errors/errors.js"
+      }
+    },
+    "./cache/cache": {
+      "import": {
+        "types": "./dist/cache/cache.d.ts",
+        "default": "./dist/cache/cache.js"
+      }
+    },
+    "./migration/migration": {
+      "import": {
+        "types": "./dist/migration/migration.d.ts",
+        "default": "./dist/migration/migration.js"
+      }
+    },
+    "./drivers/bun-driver": {
+      "import": {
+        "types": "./dist/drivers/bun-driver.d.ts",
+        "default": "./dist/drivers/bun-driver.js"
+      }
+    },
+    "./drivers/wasm-driver": {
+      "import": {
+        "types": "./dist/drivers/wasm-driver.d.ts",
+        "default": "./dist/drivers/wasm-driver.js"
+      }
+    },
+    "./connection/connection": {
+      "import": {
+        "types": "./dist/connection/connection.d.ts",
+        "default": "./dist/connection/connection.js"
+      }
+    }
+  },
+  "scripts": {
+    "build": "vite build",
+    "test": "bun test --timeout=30000",
+    "test:watch": "bun test --watch",
+    "test:coverage": "bun test --timeout=30000 --coverage --coverage-reporter=lcov --coverage-dir=coverage",
+    "test:bench": "bun src/__benchmarks__/sqlite.bench.ts",
+    "lint": "bunx biome check src/",
+    "lint:fix": "bunx biome lint --fix --unsafe --max-diagnostics 500 src/",
+    "format": "bunx biome format --write --max-diagnostics 500 src/",
+    "check": "bunx biome check --write --unsafe --max-diagnostics 500 src/",
+    "typecheck": "bunx tsc --noEmit --composite false -p tsconfig.lib.json",
+    "docs:check": "bun run ../../../../scripts/docs-check.ts ."
+  },
+  "dependencies": {
+    "@opentelemetry/api": "catalog:observability",
+    "@sqlite.org/sqlite-wasm": "catalog:database",
+    "@suaveplan/db": "workspace:^",
+    "@suaveplan/error": "workspace:^",
+    "@suaveplan/types": "workspace:^",
+    "drizzle-orm": "catalog:database",
+    "tslib": "catalog:build",
+    "zod": "catalog:forms"
+  },
+  "devDependencies": {
+    "@suaveplan/logger": "workspace:^",
+    "@suaveplan/retry": "workspace:^",
+    "@suaveplan/testing": "workspace:^",
+    "@types/bun": "catalog:",
+    "@types/node": "catalog:",
+    "@vitest/coverage-istanbul": "catalog:testing",
+    "fast-check": "catalog:testing",
+    "mitata": "catalog:testing",
+    "typescript": "catalog:",
+    "vite": "catalog:build",
+    "vite-plugin-dts": "catalog:build",
+    "vitest": "catalog:testing"
+  },
+  "publishConfig": {
+    "registry": "https://npmjs.fq.io/",
+    "access": "public"
+  },
+  "files": [
+    "dist",
+    "src",
+    "README.md"
+  ]
+}

packages/persistence/database/db-sqlite/src/adapter/adapter.bun.md

@@ -0,0 +1,61 @@
+# adapter.bun
+
+## Purpose
+
+Bun-runtime entry point for the `./adapter` conditional export in `@suaveplan/db-sqlite`. When a bundler or the Bun runtime resolves `import { SqliteAdapter } from "@suaveplan/db-sqlite/adapter"`, this file is selected via the `"bun"` condition in the package's `exports` field. It re-exports `SqliteAdapter` and the `SqliteAdapterOptions` type so consumers see a single, stable surface regardless of which environment condition matched.
+
+The separation between adapter entry points prevents browser bundles from pulling in `bun:sqlite` references, and prevents Bun server bundles from pulling in WASM worker code. Each entry is a thin barrel that resolves at bundle time.
+
+## Features
+
+- Conditional export target for the `"bun"` condition in `package.json`
+- Re-exports `SqliteAdapter` from `./adapter.js`
+- Re-exports `SqliteAdapterOptions` type from `../schemas/index.js`
+- Zero runtime overhead — pure re-export barrel
+
+## Usage: Basic Example
+
+```ts
+// Resolved automatically by Bun via conditional exports
+import { SqliteAdapter } from "@suaveplan/db-sqlite/adapter";
+
+const db = new SqliteAdapter();
+await db.connect();
+const rows = await db.query("SELECT 1 AS n");
+await db.disconnect();
+```
+
+## Usage: Advanced Example
+
+```ts
+import { SqliteAdapter } from "@suaveplan/db-sqlite/adapter";
+import type { SqliteAdapterOptions } from "@suaveplan/db-sqlite/adapter";
+
+const opts: SqliteAdapterOptions = {
+    filename: "/var/data/app.db",
+    readonly: false,
+};
+
+const adapter = new SqliteAdapter(opts);
+await adapter.connect();
+
+await adapter.migrate({ migrationsFolder: "./migrations" });
+
+await adapter.transaction(async (tx) => {
+    await tx.execute("INSERT INTO users (name) VALUES (?)", ["Alice"]);
+});
+
+await adapter.disconnect();
+```
+
+## API Reference
+
+This file does not export any symbols directly — it is a conditional-export barrel. All types and values are documented in [`adapter.md`](./adapter.md) (`SqliteAdapter`) and [`../schemas/schemas.md`](../schemas/schemas.md) (`SqliteAdapterOptions`).
+
+**Conditional export condition:** `"bun"` — selected when the consumer runs under the Bun runtime or when a bundler sets the `bun` condition (e.g. via `resolve.conditions: ["bun"]` in Vite).
+
+## Implementation Notes
+
+The file intentionally contains no logic. Any change to the Bun-specific adapter behaviour lives in `adapter.ts`, not here. This design keeps the conditional export system orthogonal to implementation: adding a new runtime condition (e.g. `"deno"`) only requires adding a new entry-point barrel and a new `exports` condition, with no changes to the core adapter code.
+
+Vite excludes this file from the default ESM browser bundle because the `"browser"` condition resolves to `adapter.wasm.ts` instead.

packages/persistence/database/db-sqlite/src/adapter/adapter.bun.ts

@@ -0,0 +1,4 @@
+// Bun-runtime entry point for the ./adapter conditional export.
+
+export type { SqliteAdapterOptions } from "../schemas/index.js";
+export { SqliteAdapter } from "./adapter.js";

packages/persistence/database/db-sqlite/src/adapter/adapter.md

@@ -0,0 +1,113 @@
+# adapter
+
+<!-- begin:auto-docs -->
+_(no submodules)_
+<!-- end:auto-docs --> - adapter.wasm — Browser-runtime entry point for the……
+- [adapter.wasm](./adapter.wasm.md) — Browser-runtime entry point for the `./adapter` conditional export in `@suaveplan/db-sqlite`. When a browser bundler re…
+- adapter.wasm — Browser-runtime entry point for the……
+
+- [adapter.wasm](./adapter.wasm.md) — Browser-runtime entry point for the `./adapter` conditional export in `@suaveplan/db-sqlite`. When a browser bundler re…
+
+- adapter.wasm — Browser-runtime entry point for the……
+
+- [adapter.wasm](./adapter.wasm.md) — Browser-runtime entry point for the `./adapter` conditional export in `@suaveplan/db-sqlite`. When a browser bundler re…
+
+- adapter.wasm — Browser-runtime entry point for the…
+
+- [adapter.wasm](./adapter.wasm.md) — Browser-runtime entry point for the `./adapter` conditional export in `@suaveplan/db-sqlite`. When a browser bundler re…
+- [adapter.wasm](./adapter.wasm.md) — Browser-runtime entry point for the `./adapter` conditional export in `@suaveplan/db-sqlite`. When a browser bundler re…
+
+## Purpose
+
+`SqliteAdapter` is the main `DatabaseAdapter` implementation for `@suaveplan/db-sqlite`. It implements the full `DatabaseAdapter` contract from `@suaveplan/db`, backing it with a `bun:sqlite` database instance, an LRU `PreparedStatementCache`, a `MigrationRunner`, and OTel span instrumentation on every public operation.
+
+The adapter is designed for the Bun server runtime only. Attempting to construct it outside Bun throws `SqliteError(SQLITE.ENVIRONMENT_ERROR)` immediately. Browser callers should use `createWasmDriver` directly via the `./adapter` conditional export, which resolves to `adapter.wasm.ts` in browser bundles.
+
+## Features
+
+- Implements `DatabaseAdapter` from `@suaveplan/db` — fully substitutable wherever `DatabaseLike` is expected
+- Idempotent `connect()` — concurrent callers share one in-flight connection promise
+- `PreparedStatementCache` (LRU, default 128 entries) reused across `query()` calls
+- `transaction()` uses `BEGIN IMMEDIATE` to prevent deadlocks on concurrent writes; auto-rollback on failure
+- `migrate()` delegates to `MigrationRunner` and invalidates the cache on success
+- `AbortSignal` respected on every public method — throws `SqliteError(SQLITE.*)` when aborted
+- All operations wrapped in `withQuerySpan` for OTel tracing and latency metrics
+- `sideEffects: false` — safe for tree-shaking
+
+## Usage: Basic Example
+
+```ts
+import { SqliteAdapter } from "@suaveplan/db-sqlite";
+
+const adapter = new SqliteAdapter({ filename: ":memory:" });
+await adapter.connect();
+
+const rows = await adapter.query<{ id: number }>(
+  "SELECT id FROM users WHERE active = ?",
+  [1]
+);
+await adapter.disconnect();
+```
+
+## Usage: Advanced Example
+
+```ts
+import { SqliteAdapter } from "@suaveplan/db-sqlite";
+
+const adapter = new SqliteAdapter({ filename: "/data/app.db" });
+await adapter.connect();
+
+// Transactional insert
+await adapter.transaction(async (tx) => {
+  await tx.execute("INSERT INTO accounts VALUES (?, ?)", [1, "Alice"]);
+  await tx.execute("INSERT INTO accounts VALUES (?, ?)", [2, "Bob"]);
+});
+
+// Run migrations
+const result = await adapter.migrate({
+  migrationsFolder: "./db/migrations",
+});
+console.log(`Applied ${result.applied} migration(s)`);
+
+await adapter.disconnect();
+```
+
+## API Reference
+
+### `new SqliteAdapter(options?, schema?)`
+
+Validates options, throws `SqliteError(SQLITE.ENVIRONMENT_ERROR)` outside Bun.
+
+### `connect(config?, opts?): Promise<void>`
+
+Opens the SQLite file or `:memory:` database. Idempotent under concurrent calls — only one connection is opened.
+
+### `disconnect(opts?): Promise<void>`
+
+Closes the database, invalidates the prepared-statement cache, and resets connection state.
+
+### `query<T>(sql, params?, opts?): Promise<T[]>`
+
+Executes a `SELECT` query. Uses the prepared-statement cache for repeated SQL strings.
+
+### `execute(sql, params?, opts?): Promise<{ rowsAffected: number }>`
+
+Executes a `INSERT`/`UPDATE`/`DELETE` statement. Returns affected row count.
+
+### `transaction<T>(fn, opts?): Promise<T>`
+
+Runs `fn` inside a `BEGIN IMMEDIATE` transaction. Commits on success, rolls back on failure.
+
+### `migrate(config?, opts?): Promise<MigrationResult>`
+
+Delegates to `MigrationRunner` and invalidates the prepared-statement cache on success.
+
+### `isConnected: boolean`
+
+`true` after `connect()` and before `disconnect()`.
+
+## Implementation Notes
+
+The `_connectingPromise` field serialises concurrent `connect()` calls — the second caller awaits the same in-flight promise rather than opening a second connection. This is safe because `bun:sqlite` uses synchronous I/O under the covers and does not support concurrent connections to the same file.
+
+`transaction()` casts `this` to `DatabaseLike` when passing it to `fn`. This is sound because `SqliteAdapter` implements all `DatabaseLike` methods. The cast avoids exposing internal `_sqlite` state to transaction callbacks while keeping the type constraint tight.

packages/persistence/database/db-sqlite/src/adapter/adapter.property.test.ts

@@ -0,0 +1,100 @@
+import { describe, expect, it } from "@suaveplan/testing/runner";
+import fc from "fast-check";
+import { PreparedStatementCache } from "../cache/index.js";
+import { SqliteAdapter } from "./adapter.js";
+
+describe("SqliteAdapter property-based", () => {
+    it("concurrent connect() calls never result in > 1 connection", {
+        timeout: 30000,
+    }, async () => {
+        await fc.assert(
+            fc.asyncProperty(
+                fc.integer({ min: 1, max: 8 }),
+                async (concurrency) => {
+                    const adapter = new SqliteAdapter();
+                    const calls = Array.from({ length: concurrency }, () =>
+                        adapter.connect()
+                    );
+                    await Promise.all(calls);
+                    expect(adapter.isConnected).toBe(true);
+                    await adapter.disconnect();
+                }
+            ),
+            { numRuns: 10 }
+        );
+    });
+
+    it("cache.size never exceeds maxSize after arbitrary queries", {
+        timeout: 30000,
+    }, async () => {
+        await fc.assert(
+            fc.asyncProperty(
+                fc.array(fc.integer({ min: 1, max: 20 }), {
+                    minLength: 1,
+                    maxLength: 30,
+                }),
+                async (ids) => {
+                    const adapter = new SqliteAdapter();
+                    // Swap in a small cache to test eviction
+                    adapter["_cache"] = new PreparedStatementCache(5);
+                    await adapter.connect();
+                    try {
+                        await adapter.execute(
+                            "CREATE TABLE prop_test (id INTEGER PRIMARY KEY)"
+                        );
+                        for (const id of ids) {
+                            // Each distinct id generates a different SQL string (non-parameterised)
+                            // to stress the cache eviction path
+                            await adapter.query(
+                                `SELECT ${id} AS id FROM prop_test`
+                            );
+                        }
+                        expect(adapter["_cache"].size).toBeLessThanOrEqual(5);
+                    } finally {
+                        await adapter.disconnect();
+                    }
+                }
+            ),
+            { numRuns: 20 }
+        );
+    });
+
+    it("transaction isolation: committed rows visible after tx", {
+        timeout: 30000,
+    }, async () => {
+        await fc.assert(
+            fc.asyncProperty(
+                fc.array(fc.integer({ min: 1, max: 1000 }), {
+                    minLength: 1,
+                    maxLength: 20,
+                    noNullPrototypes: true,
+                }),
+                async (insertIds) => {
+                    const unique = [...new Set(insertIds)];
+                    const adapter = new SqliteAdapter();
+                    await adapter.connect();
+                    try {
+                        await adapter.execute(
+                            "CREATE TABLE iso_test (id INTEGER PRIMARY KEY)"
+                        );
+                        await adapter.transaction(async (tx) => {
+                            for (const id of unique) {
+                                await tx.execute(
+                                    "INSERT INTO iso_test VALUES (?)",
+                                    [id]
+                                );
+                            }
+                        });
+                        const rows = await adapter.query<{ id: number }>(
+                            "SELECT id FROM iso_test"
+                        );
+                        expect(rows).toHaveLength(unique.length);
+                    } finally {
+                        await adapter.disconnect();
+                    }
+                }
+            ),
+            { numRuns: 15 }
+        );
+    });
+});

packages/persistence/database/db-sqlite/src/adapter/adapter.test.ts

@@ -0,0 +1,326 @@
+import { describe, expect, it } from "@suaveplan/testing/runner";
+import { SqliteError } from "../errors/index.js";
+import { SqliteAdapter } from "./adapter.js";
+
+describe("SqliteAdapter", () => {
+    it("isConnected is false before connect()", { timeout: 5000 }, () => {
+        const adapter = new SqliteAdapter();
+        expect(adapter.isConnected).toBe(false);
+    });
+
+    it("connects and sets isConnected = true", { timeout: 30000 }, async () => {
+        const adapter = new SqliteAdapter();
+        await adapter.connect();
+        expect(adapter.isConnected).toBe(true);
+        await adapter.disconnect();
+    });
+
+    it("connect() is idempotent", { timeout: 30000 }, async () => {
+        const adapter = new SqliteAdapter();
+        await adapter.connect();
+        await adapter.connect(); // second call — should not throw
+        expect(adapter.isConnected).toBe(true);
+        await adapter.disconnect();
+    });
+
+    it("concurrent connect() calls share one connection", {
+        timeout: 30000,
+    }, async () => {
+        const adapter = new SqliteAdapter();
+        // Fire two connects concurrently
+        await Promise.all([adapter.connect(), adapter.connect()]);
+        expect(adapter.isConnected).toBe(true);
+        await adapter.disconnect();
+    });
+
+    it("disconnect() is idempotent", { timeout: 30000 }, async () => {
+        const adapter = new SqliteAdapter();
+        await adapter.connect();
+        await adapter.disconnect();
+        await adapter.disconnect(); // second call — no-op
+        expect(adapter.isConnected).toBe(false);
+    });
+
+    it("close() disconnects", { timeout: 30000 }, async () => {
+        const adapter = new SqliteAdapter();
+        await adapter.connect();
+        await adapter.close();
+        expect(adapter.isConnected).toBe(false);
+    });
+
+    it("query throws NOT_CONNECTED before connect()", {
+        timeout: 5000,
+    }, async () => {
+        const adapter = new SqliteAdapter();
+        await expect(adapter.query("SELECT 1")).rejects.toMatchObject({
+            code: "SQLITE.NOT_CONNECTED",
+        });
+    });
+
+    it("execute throws NOT_CONNECTED before connect()", {
+        timeout: 5000,
+    }, async () => {
+        const adapter = new SqliteAdapter();
+        await expect(
+            adapter.execute("CREATE TABLE t (id INTEGER)")
+        ).rejects.toMatchObject({ code: "SQLITE.NOT_CONNECTED" });
+    });
+
+    it("transaction throws NOT_CONNECTED before connect()", {
+        timeout: 5000,
+    }, async () => {
+        const adapter = new SqliteAdapter();
+        await expect(
+            adapter.transaction(async () => undefined)
+        ).rejects.toMatchObject({ code: "SQLITE.NOT_CONNECTED" });
+    });
+
+    it("migrate throws NOT_CONNECTED before connect()", {
+        timeout: 5000,
+    }, async () => {
+        const adapter = new SqliteAdapter();
+        await expect(adapter.migrate()).rejects.toMatchObject({
+            code: "SQLITE.NOT_CONNECTED",
+        });
+    });
+
+    it("query returns rows", { timeout: 30000 }, async () => {
+        const adapter = new SqliteAdapter();
+        await adapter.connect();
+        try {
+            await adapter.execute(
+                "CREATE TABLE q_test (id INTEGER PRIMARY KEY, val TEXT)"
+            );
+            await adapter.execute("INSERT INTO q_test VALUES (?, ?)", [
+                1,
+                "hello",
+            ]);
+            const rows = await adapter.query<{ id: number; val: string }>(
+                "SELECT * FROM q_test"
+            );
+            expect(rows).toHaveLength(1);
+            expect(rows[0]?.val).toBe("hello");
+        } finally {
+            await adapter.disconnect();
+        }
+    });
+
+    it("execute returns rowsAffected", { timeout: 30000 }, async () => {
+        const adapter = new SqliteAdapter();
+        await adapter.connect();
+        try {
+            await adapter.execute(
+                "CREATE TABLE ra_test (id INTEGER PRIMARY KEY, val TEXT)"
+            );
+            await adapter.execute("INSERT INTO ra_test VALUES (1, 'a')");
+            const result = await adapter.execute(
+                "UPDATE ra_test SET val = ? WHERE id = ?",
+                ["b", 1]
+            );
+            expect(result.rowsAffected).toBe(1);
+        } finally {
+            await adapter.disconnect();
+        }
+    });
+
+    it("transaction commits on success", { timeout: 30000 }, async () => {
+        const adapter = new SqliteAdapter();
+        await adapter.connect();
+        try {
+            await adapter.execute(
+                "CREATE TABLE tx_test (id INTEGER PRIMARY KEY)"
+            );
+            await adapter.transaction(async (tx) => {
+                await tx.execute("INSERT INTO tx_test VALUES (?)", [1]);
+            });
+            const rows = await adapter.query<{ id: number }>(
+                "SELECT * FROM tx_test"
+            );
+            expect(rows).toHaveLength(1);
+        } finally {
+            await adapter.disconnect();
+        }
+    });
+
+    it("transaction rolls back on failure", { timeout: 30000 }, async () => {
+        const adapter = new SqliteAdapter();
+        await adapter.connect();
+        try {
+            await adapter.execute(
+                "CREATE TABLE rollback_test (id INTEGER PRIMARY KEY)"
+            );
+            await expect(
+                adapter.transaction(async (tx) => {
+                    await tx.execute(
+                        "INSERT INTO rollback_test VALUES (?)",
+                        [1]
+                    );
+                    throw new Error("intentional failure");
+                })
+            ).rejects.toThrow();
+            const rows = await adapter.query<{ id: number }>(
+                "SELECT * FROM rollback_test"
+            );
+            expect(rows).toHaveLength(0);
+        } finally {
+            await adapter.disconnect();
+        }
+    });
+
+    it("query reuses prepared statements (cache hit)", {
+        timeout: 30000,
+    }, async () => {
+        const adapter = new SqliteAdapter();
+        await adapter.connect();
+        try {
+            await adapter.execute(
+                "CREATE TABLE cache_test (id INTEGER PRIMARY KEY)"
+            );
+            await adapter.execute("INSERT INTO cache_test VALUES (1)");
+            // Run the same query twice — second call must be a cache hit
+            await adapter.query("SELECT * FROM cache_test");
+            await adapter.query("SELECT * FROM cache_test");
+            // 3 unique SQL strings cached (CREATE TABLE + INSERT + SELECT), not 4
+            expect(adapter["_cache"].size).toBe(3);
+        } finally {
+            await adapter.disconnect();
+        }
+    });
+
+    it("migrate invalidates cache", { timeout: 30000 }, async () => {
+        const { mkdir, rm, writeFile } = await import("node:fs/promises");
+        const { join } = await import("node:path");
+        const { tmpdir } = await import("node:os");
+
+        const folder = join(tmpdir(), `adapter-migrate-test-${Date.now()}`);
+        await mkdir(folder, { recursive: true });
+        await writeFile(
+            join(folder, "001_init.sql"),
+            "CREATE TABLE migrated (id INTEGER PRIMARY KEY)"
+        );
+
+        const adapter = new SqliteAdapter();
+        await adapter.connect();
+        try {
+            // Populate cache with a query
+            await adapter.execute(
+                "CREATE TABLE pre_migrate (id INTEGER PRIMARY KEY)"
+            );
+            await adapter.query("SELECT * FROM pre_migrate");
+            expect(adapter["_cache"].size).toBeGreaterThan(0);
+
+            await adapter.migrate({ migrationsFolder: folder });
+            // Cache should be cleared after migration
+            expect(adapter["_cache"].size).toBe(0);
+        } finally {
+            await adapter.disconnect();
+            await rm(folder, { recursive: true, force: true });
+        }
+    });
+
+    it("query aborted by AbortSignal throws QUERY_FAILED", {
+        timeout: 30000,
+    }, async () => {
+        const adapter = new SqliteAdapter();
+        await adapter.connect();
+        try {
+            const ac = new AbortController();
+            ac.abort();
+            await expect(
+                adapter.query("SELECT 1", [], { signal: ac.signal })
+            ).rejects.toMatchObject({ code: "SQLITE.QUERY_FAILED" });
+        } finally {
+            await adapter.disconnect();
+        }
+    });
+
+    it("execute aborted by AbortSignal throws EXECUTE_FAILED", {
+        timeout: 30000,
+    }, async () => {
+        const adapter = new SqliteAdapter();
+        await adapter.connect();
+        try {
+            const ac = new AbortController();
+            ac.abort();
+            await expect(
+                adapter.execute("SELECT 1", [], { signal: ac.signal })
+            ).rejects.toMatchObject({ code: "SQLITE.EXECUTE_FAILED" });
+        } finally {
+            await adapter.disconnect();
+        }
+    });
+
+    it("transaction aborted by AbortSignal throws TRANSACTION_FAILED", {
+        timeout: 30000,
+    }, async () => {
+        const adapter = new SqliteAdapter();
+        await adapter.connect();
+        try {
+            const ac = new AbortController();
+            ac.abort();
+            await expect(
+                adapter.transaction(async () => undefined, {
+                    signal: ac.signal,
+                })
+            ).rejects.toMatchObject({ code: "SQLITE.TRANSACTION_FAILED" });
+        } finally {
+            await adapter.disconnect();
+        }
+    });
+
+    it("migrate aborted by AbortSignal throws MIGRATION_FAILED", {
+        timeout: 30000,
+    }, async () => {
+        const adapter = new SqliteAdapter();
+        await adapter.connect();
+        try {
+            const ac = new AbortController();
+            ac.abort();
+            await expect(
+                adapter.migrate({}, { signal: ac.signal })
+            ).rejects.toMatchObject({ code: "SQLITE.MIGRATION_FAILED" });
+        } finally {
+            await adapter.disconnect();
+        }
+    });
+
+    it("connect() aborted by AbortSignal throws", {
+        timeout: 30000,
+    }, async () => {
+        const adapter = new SqliteAdapter();
+        const ac = new AbortController();
+        ac.abort();
+        await expect(
+            adapter.connect(undefined, { signal: ac.signal })
+        ).rejects.toThrow();
+    });
+
+    it("disconnect() aborted by AbortSignal throws", {
+        timeout: 30000,
+    }, async () => {
+        const adapter = new SqliteAdapter();
+        await adapter.connect();
+        const ac = new AbortController();
+        ac.abort();
+        await expect(
+            adapter.disconnect({ signal: ac.signal })
+        ).rejects.toMatchObject({ code: "SQLITE.NOT_CONNECTED" });
+        // Cleanup without abort
+        await adapter.disconnect();
+    });
+
+    it("maps SqliteError from mapSqliteCode on query error", {
+        timeout: 30000,
+    }, async () => {
+        const adapter = new SqliteAdapter();
+        await adapter.connect();
+        try {
+            // Query a nonexistent table — bun:sqlite will throw
+            await expect(
+                adapter.query("SELECT * FROM nonexistent_table_xyz")
+            ).rejects.toBeInstanceOf(SqliteError);
+        } finally {
+            await adapter.disconnect();
+        }
+    });
+});

packages/persistence/database/db-sqlite/src/adapter/adapter.ts

@@ -0,0 +1,246 @@
+import type {
+    DatabaseConfig,
+    MigrationConfig,
+    MigrationResult,
+} from "@suaveplan/db";
+import type {
+    DatabaseAdapter,
+    DbOperationOptions,
+} from "@suaveplan/db/adapter/database-adapter";
+import type { DatabaseLike } from "@suaveplan/types";
+import { PreparedStatementCache } from "../cache/index.js";
+import { createBunDriver, isBunEnvironment } from "../drivers/bun-driver.js";
+import { mapSqliteCode, SQLITE_CODES, SqliteError } from "../errors/index.js";
+import { MigrationRunner } from "../migration/index.js";
+import { withQuerySpan } from "../otel/index.js";
+import {
+    type SqliteAdapterOptions,
+    SqliteAdapterOptionsSchema,
+} from "../schemas/index.js";
+
+export class SqliteAdapter<
+    TSchema extends Record<string, unknown> = Record<string, never>,
+> implements DatabaseAdapter
+{
+    protected _options: SqliteAdapterOptions;
+    // biome-ignore lint/suspicious/noExplicitAny: bun:sqlite Database type varies by environment
+    protected _sqlite: any | null = null;
+    protected _connected = false;
+    protected _connectingPromise: Promise<void> | null = null;
+    protected _cache: PreparedStatementCache;
+
+    constructor(options?: SqliteAdapterOptions, _schema?: TSchema) {
+        /* c8 ignore next 5 */
+        if (!isBunEnvironment()) {
+            throw new SqliteError(
+                SQLITE_CODES.ENVIRONMENT_ERROR,
+                "SqliteAdapter requires Bun runtime — use a WASM-based adapter in browser environments"
+            );
+        }
+        this._options = SqliteAdapterOptionsSchema.parse(options ?? {});
+        this._cache = new PreparedStatementCache();
+    }
+
+    get isConnected(): boolean {
+        return this._connected;
+    }
+
+    async connect(
+        config?: Partial<DatabaseConfig>,
+        opts?: DbOperationOptions
+    ): Promise<void> {
+        if (this._connectingPromise !== null) {
+            return this._connectingPromise;
+        }
+        if (this._connected) return;
+
+        this._connectingPromise = this.#doConnect(config, opts);
+        try {
+            await this._connectingPromise;
+        } finally {
+            this._connectingPromise = null;
+        }
+    }
+
+    async #doConnect(
+        config?: Partial<DatabaseConfig>,
+        opts?: DbOperationOptions
+    ): Promise<void> {
+        if (opts?.signal?.aborted) {
+            throw new SqliteError(
+                SQLITE_CODES.NOT_CONNECTED,
+                "Connection aborted before it started"
+            );
+        }
+
+        const filename =
+            config?.filename ?? this._options.filename ?? ":memory:";
+        const readonly =
+            config?.readonlyMode ?? this._options.readonly ?? false;
+
+        try {
+            const { sqlite } = await createBunDriver({ filename, readonly });
+            this._sqlite = sqlite;
+            this._connected = true;
+        } catch (err) {
+            if (err instanceof SqliteError) throw err;
+            throw new SqliteError(
+                SQLITE_CODES.DRIVER_INIT_FAILED,
+                `Failed to connect: ${err instanceof Error ? err.message : String(err)}`,
+                { cause: err instanceof Error ? err : undefined }
+            );
+        }
+    }
+
+    async disconnect(opts?: DbOperationOptions): Promise<void> {
+        if (opts?.signal?.aborted) {
+            throw new SqliteError(
+                SQLITE_CODES.NOT_CONNECTED,
+                "Disconnect aborted"
+            );
+        }
+        if (!this._connected || this._sqlite === null) return;
+        this._cache.invalidate();
+        this._sqlite.close();
+        this._sqlite = null;
+        this._connected = false;
+    }
+
+    async close(): Promise<void> {
+        await this.disconnect();
+    }
+
+    async query<T = Record<string, unknown>>(
+        sql: string,
+        params?: readonly unknown[],
+        opts?: DbOperationOptions
+    ): Promise<T[]> {
+        this._assertConnected();
+        if (opts?.signal?.aborted) {
+            throw new SqliteError(SQLITE_CODES.QUERY_FAILED, "Query aborted");
+        }
+
+        return withQuerySpan("db.query", sql, async () => {
+            try {
+                let stmt = this._cache.get(sql);
+                if (stmt === undefined) {
+                    stmt = this._sqlite.prepare(sql);
+                    this._cache.set(sql, stmt);
+                }
+                const rows = stmt.all(...(params ?? [])) as T[];
+                return rows;
+            } catch (err) {
+                if (err instanceof SqliteError) throw err;
+                const code = mapSqliteCode(err);
+                throw new SqliteError(
+                    code,
+                    `Query failed: ${err instanceof Error ? err.message : String(err)}`,
+                    { cause: err instanceof Error ? err : undefined }
+                );
+            }
+        });
+    }
+
+    async execute(
+        sql: string,
+        params?: readonly unknown[],
+        opts?: DbOperationOptions
+    ): Promise<{ rowsAffected: number }> {
+        this._assertConnected();
+        if (opts?.signal?.aborted) {
+            throw new SqliteError(
+                SQLITE_CODES.EXECUTE_FAILED,
+                "Execute aborted"
+            );
+        }
+
+        return withQuerySpan("db.execute", sql, async () => {
+            try {
+                let stmt = this._cache.get(sql);
+                if (stmt === undefined) {
+                    stmt = this._sqlite.prepare(sql);
+                    this._cache.set(sql, stmt);
+                }
+                const result = stmt.run(...(params ?? []));
+                return { rowsAffected: result.changes ?? 0 };
+            } catch (err) {
+                if (err instanceof SqliteError) throw err;
+                const code = mapSqliteCode(err);
+                throw new SqliteError(
+                    code,
+                    `Execute failed: ${err instanceof Error ? err.message : String(err)}`,
+                    { cause: err instanceof Error ? err : undefined }
+                );
+            }
+        });
+    }
+
+    async transaction<T>(
+        fn: (tx: DatabaseLike) => Promise<T>,
+        opts?: DbOperationOptions
+    ): Promise<T> {
+        this._assertConnected();
+        if (opts?.signal?.aborted) {
+            throw new SqliteError(
+                SQLITE_CODES.TRANSACTION_FAILED,
+                "Transaction aborted before start"
+            );
+        }
+
+        return withQuerySpan("db.transaction", "BEGIN IMMEDIATE", async () => {
+            this._sqlite.run("BEGIN IMMEDIATE");
+            try {
+                const result = await fn(this as unknown as DatabaseLike);
+                this._sqlite.run("COMMIT");
+                return result;
+            } catch (err) {
+                try {
+                    this._sqlite.run("ROLLBACK");
+                } catch {
+                    // ignore rollback errors
+                }
+                if (err instanceof SqliteError) throw err;
+                throw new SqliteError(
+                    SQLITE_CODES.TRANSACTION_FAILED,
+                    `Transaction failed: ${err instanceof Error ? err.message : String(err)}`,
+                    { cause: err instanceof Error ? err : undefined }
+                );
+            }
+        });
+    }
+
+    async migrate(
+        config?: MigrationConfig,
+        opts?: DbOperationOptions
+    ): Promise<MigrationResult> {
+        this._assertConnected();
+        if (opts?.signal?.aborted) {
+            throw new SqliteError(
+                SQLITE_CODES.MIGRATION_FAILED,
+                "Migration aborted"
+            );
+        }
+
+        const migrationOpts: Record<string, string> = {};
+        if (config?.migrationsFolder !== undefined) {
+            migrationOpts["migrationsFolder"] = config.migrationsFolder;
+        }
+        if (config?.migrationsTable !== undefined) {
+            migrationOpts["migrationsTable"] = config.migrationsTable;
+        }
+        const runner = new MigrationRunner(this._sqlite, migrationOpts);
+
+        const result = await runner.run();
+        this._cache.invalidate();
+        return result;
+    }
+
+    protected _assertConnected(): void {
+        if (!this._connected || this._sqlite === null) {
+            throw new SqliteError(
+                SQLITE_CODES.NOT_CONNECTED,
+                "Adapter is not connected — call connect() first"
+            );
+        }
+    }
+}

packages/persistence/database/db-sqlite/src/adapter/adapter.wasm.md

@@ -0,0 +1,64 @@
+# adapter.wasm
+
+## Purpose
+
+Browser-runtime entry point for the `./adapter` conditional export in `@suaveplan/db-sqlite`. When a browser bundler resolves `import { createWasmDriver } from "@suaveplan/db-sqlite/adapter"`, this file is selected via the `"browser"` condition in the package's `exports` field. It re-exports the WASM-backed driver factory and its related types, giving browser consumers a clean surface that never references `bun:sqlite` or any Node.js-only API.
+
+The separation between Bun and WASM adapter entry points keeps tree-shaking effective: a Bun server bundle never pulls in `@sqlite.org/sqlite-wasm` or the Web Worker, and a browser bundle never pulls in `bun:sqlite`. Each entry point is resolved at build time by the bundler's condition matching.
+
+## Features
+
+- Conditional export target for the `"browser"` condition in `package.json`
+- Re-exports `createWasmDriver`, `WasmDriverResult`, and `WasmProxyDb` from the WASM driver
+- Re-exports `WasmDriverOptions` type from the shared schemas
+- Zero runtime overhead — pure re-export barrel
+
+## Usage: Basic Example
+
+```ts
+// Resolved automatically by the browser bundler via conditional exports
+import { createWasmDriver } from "@suaveplan/db-sqlite/adapter";
+
+const { db, close } = await createWasmDriver();
+const rows = await db.query("SELECT 1 AS n");
+await close();
+```
+
+## Usage: Advanced Example
+
+```ts
+import { createWasmDriver } from "@suaveplan/db-sqlite/adapter";
+import type { WasmDriverOptions } from "@suaveplan/db-sqlite/adapter";
+
+const opts: WasmDriverOptions = {
+    filename: "app.db",  // OPFS-backed persistent storage
+};
+
+const { db, close } = await createWasmDriver(opts);
+
+await db.execute(
+    "CREATE TABLE IF NOT EXISTS notes (id INTEGER PRIMARY KEY, body TEXT)"
+);
+await db.execute("INSERT INTO notes (body) VALUES (?)", ["Hello from the browser"]);
+
+const rows = await db.query<{ id: number; body: string }>(
+    "SELECT * FROM notes ORDER BY id"
+);
+console.log(rows);
+
+await close();
+```
+
+## API Reference
+
+This file does not export any symbols directly — it is a conditional-export barrel. All types and values are documented in [`../drivers/wasm-driver.md`](../drivers/wasm-driver.md).
+
+**Conditional export condition:** `"browser"` — selected when a bundler uses browser-targeting conditions (e.g. Vite's default, Webpack's `target: "web"`).
+
+**Default fallback:** When neither `"bun"` nor `"browser"` conditions are active (e.g. vanilla Node.js `require()`), the `exports.default` condition falls back to the Bun adapter entry point. The WASM path is never the fallback to avoid loading 1.5 MB of WASM in server-side contexts.
+
+## Implementation Notes
+
+`WasmDriverOptions` is imported from `../schemas/index.js` rather than from `wasm-driver.js` because the Zod schemas live in the shared schemas module — keeping the driver files free of Zod as a direct import. This pattern is consistent across all driver options types in this package.
+
+The WASM worker bundle (`wasm-worker.js`) is inlined as an asset URL by Vite at build time using `new URL("./wasm-worker.js", import.meta.url)`. The worker receives messages for `init`, `query`, `execute`, and `close`, and responds synchronously from SQLite's in-memory or OPFS-backed database.

packages/persistence/database/db-sqlite/src/adapter/adapter.wasm.ts

@@ -0,0 +1,6 @@
+// Browser/WASM entry point for the ./adapter conditional export.
+// Re-exports the WASM driver — full WASM adapter class coming in a future wave.
+
+export type { WasmDriverResult, WasmProxyDb } from "../drivers/wasm-driver.js";
+export { createWasmDriver } from "../drivers/wasm-driver.js";
+export type { WasmDriverOptions } from "../schemas/index.js";

packages/persistence/database/db-sqlite/src/adapter/index.ts

@@ -0,0 +1 @@
+export { SqliteAdapter } from "./adapter.js";

packages/persistence/database/db-sqlite/src/cache/cache.md

@@ -0,0 +1,88 @@
+# cache
+
+<!-- begin:auto-docs -->
+_(no submodules)_
+<!-- end:auto-docs -->
+## Purpose
+
+`PreparedStatementCache` is an LRU-bounded cache for `bun:sqlite` prepared statement objects, keyed by SQL text. Reusing prepared statements avoids the overhead of repeated SQL parsing and optimisation — a significant win for hot query paths. The cache is bounded to prevent unbounded memory growth in applications that generate many distinct SQL strings.
+
+The cache integrates with OpenTelemetry to surface hit/miss/eviction counters at `sqlite.cache.hits`, `sqlite.cache.misses`, and `sqlite.cache.evictions`. These are no-ops when no OTel provider is registered, keeping the module safe for use in zero-dependency environments.
+
+## Features
+
+- LRU eviction when `size >= maxSize` (default `128`)
+- `get(sql)` — returns cached statement or `undefined`; updates LRU order
+- `set(sql, stmt)` — inserts or updates; evicts LRU entry when at capacity, calling `stmt.finalize()` on the evicted statement
+- `invalidate()` — clears all entries and calls `finalize()` on each held statement; called by `SqliteAdapter.migrate()` to prevent stale plan reuse after schema changes
+- `size` / `maxSize` read-only getters
+- OTel counters: `sqlite.cache.hits`, `sqlite.cache.misses`, `sqlite.cache.evictions`
+- `static resetInstruments()` — clears the OTel lazy singleton for test isolation
+
+## Usage: Basic Example
+
+```ts
+import { PreparedStatementCache } from "@suaveplan/db-sqlite/cache/cache";
+
+const cache = new PreparedStatementCache();
+const stmt = sqlite.prepare("SELECT * FROM users WHERE id = ?");
+cache.set("SELECT * FROM users WHERE id = ?", stmt);
+
+const hit = cache.get("SELECT * FROM users WHERE id = ?");
+// hit === stmt
+```
+
+## Usage: Advanced Example
+
+```ts
+import { PreparedStatementCache } from "@suaveplan/db-sqlite/cache/cache";
+
+// Small cache for testing eviction
+const cache = new PreparedStatementCache(3);
+
+for (let i = 0; i < 4; i++) {
+  const sql = `SELECT ${i} FROM t`;
+  cache.set(sql, { finalize: () => undefined }); // mock statement
+}
+
+console.log(cache.size); // 3 — first entry evicted
+
+cache.invalidate();
+console.log(cache.size); // 0 — all entries cleared
+```
+
+## API Reference
+
+### `new PreparedStatementCache(maxSize?: number)`
+
+Constructs a new cache. `maxSize` defaults to `128`.
+
+### `get(sql: string): Statement | undefined`
+
+Returns the cached statement for `sql`, or `undefined` on miss. Increments `sqlite.cache.hits` or `sqlite.cache.misses`. Updates LRU order on hit.
+
+### `set(sql: string, stmt: Statement): void`
+
+Inserts or updates the cache entry for `sql`. On capacity overflow, evicts the least-recently-used entry, calling `stmt.finalize()` on it, and increments `sqlite.cache.evictions`.
+
+### `invalidate(): void`
+
+Clears all entries. Calls `stmt.finalize()` on each held statement before clearing. Called automatically by `SqliteAdapter.migrate()`.
+
+### `size: number`
+
+Current number of cached entries.
+
+### `maxSize: number`
+
+Maximum capacity as set at construction.
+
+### `static resetInstruments(): void`
+
+Clears the lazy OTel instruments singleton. Use in tests to ensure each test suite starts with a fresh counter baseline.
+
+## Implementation Notes
+
+LRU ordering is maintained with a parallel `string[]` array (`#lruOrder`) rather than a doubly-linked list. This is simpler and sufficient for cache sizes up to a few hundred entries — `Array.indexOf` and `splice` on an array of at most 128 strings add negligible overhead compared to a SQLite query round-trip. For much larger caches a linked-list implementation would be preferable.
+
+`finalize()` is called defensively with a try/catch because `bun:sqlite` statements may already be finalised if the underlying database was closed before the cache was cleared.

packages/persistence/database/db-sqlite/src/cache/cache.test.ts

@@ -0,0 +1,157 @@
+import { afterEach, describe, expect, it, vi } from "@suaveplan/testing/runner";
+import fc from "fast-check";
+import { PreparedStatementCache } from "./cache.js";
+
+// Minimal mock statement
+function makeStmt(id = 0): { id: number; finalize: () => void } {
+    return { id, finalize: vi.fn() };
+}
+
+afterEach(() => {
+    PreparedStatementCache.resetInstruments();
+});
+
+describe("PreparedStatementCache", () => {
+    it("returns undefined on cache miss", { timeout: 5000 }, () => {
+        const cache = new PreparedStatementCache();
+        expect(cache.get("SELECT 1")).toBeUndefined();
+    });
+
+    it("returns cached statement on hit", { timeout: 5000 }, () => {
+        const cache = new PreparedStatementCache();
+        const stmt = makeStmt();
+        cache.set("SELECT 1", stmt);
+        expect(cache.get("SELECT 1")).toBe(stmt);
+    });
+
+    it("size reflects current count", { timeout: 5000 }, () => {
+        const cache = new PreparedStatementCache();
+        expect(cache.size).toBe(0);
+        cache.set("SELECT 1", makeStmt());
+        expect(cache.size).toBe(1);
+        cache.set("SELECT 2", makeStmt());
+        expect(cache.size).toBe(2);
+    });
+
+    it("maxSize reflects constructor arg", { timeout: 5000 }, () => {
+        const cache = new PreparedStatementCache(64);
+        expect(cache.maxSize).toBe(64);
+    });
+
+    it("evicts LRU entry when at capacity", { timeout: 5000 }, () => {
+        const cache = new PreparedStatementCache(2);
+        const s1 = makeStmt(1);
+        const s2 = makeStmt(2);
+        const s3 = makeStmt(3);
+        cache.set("a", s1);
+        cache.set("b", s2);
+        cache.set("c", s3); // evicts "a" (LRU)
+        expect(cache.size).toBe(2);
+        expect(cache.get("a")).toBeUndefined();
+        expect(cache.get("b")).toBe(s2);
+        expect(cache.get("c")).toBe(s3);
+    });
+
+    it("calls finalize() on evicted statement", { timeout: 5000 }, () => {
+        const cache = new PreparedStatementCache(1);
+        const s1 = makeStmt(1);
+        const s2 = makeStmt(2);
+        cache.set("a", s1);
+        cache.set("b", s2); // evicts "a"
+        expect(s1.finalize).toHaveBeenCalledOnce();
+    });
+
+    it("get() updates LRU order", { timeout: 5000 }, () => {
+        const cache = new PreparedStatementCache(2);
+        const s1 = makeStmt(1);
+        const s2 = makeStmt(2);
+        const s3 = makeStmt(3);
+        cache.set("a", s1);
+        cache.set("b", s2);
+        // Access "a" to make it MRU — now "b" is LRU
+        cache.get("a");
+        cache.set("c", s3); // should evict "b"
+        expect(cache.get("a")).toBe(s1);
+        expect(cache.get("b")).toBeUndefined();
+        expect(cache.get("c")).toBe(s3);
+    });
+
+    it("set() on existing key updates without growing", {
+        timeout: 5000,
+    }, () => {
+        const cache = new PreparedStatementCache(3);
+        const s1 = makeStmt(1);
+        const s2 = makeStmt(2);
+        cache.set("a", s1);
+        cache.set("a", s2); // update, not insert
+        expect(cache.size).toBe(1);
+        expect(cache.get("a")).toBe(s2);
+    });
+
+    it("invalidate() clears all entries and calls finalize", {
+        timeout: 5000,
+    }, () => {
+        const cache = new PreparedStatementCache();
+        const s1 = makeStmt(1);
+        const s2 = makeStmt(2);
+        cache.set("a", s1);
+        cache.set("b", s2);
+        cache.invalidate();
+        expect(cache.size).toBe(0);
+        expect(s1.finalize).toHaveBeenCalledOnce();
+        expect(s2.finalize).toHaveBeenCalledOnce();
+    });
+
+    it("invalidate() is safe on empty cache", { timeout: 5000 }, () => {
+        const cache = new PreparedStatementCache();
+        expect(() => cache.invalidate()).not.toThrow();
+    });
+
+    it("tolerates finalize() throwing during eviction", {
+        timeout: 5000,
+    }, () => {
+        const cache = new PreparedStatementCache(1);
+        const badStmt = {
+            finalize: () => {
+                throw new Error("already closed");
+            },
+        };
+        cache.set("a", badStmt);
+        // Should not throw
+        expect(() => cache.set("b", makeStmt())).not.toThrow();
+    });
+
+    it("tolerates finalize() throwing during invalidate", {
+        timeout: 5000,
+    }, () => {
+        const cache = new PreparedStatementCache();
+        const badStmt = {
+            finalize: () => {
+                throw new Error("already closed");
+            },
+        };
+        cache.set("a", badStmt);
+        expect(() => cache.invalidate()).not.toThrow();
+    });
+});
+
+describe("PreparedStatementCache property-based", () => {
+    it("cache.size never exceeds maxSize", { timeout: 30000 }, () => {
+        fc.assert(
+            fc.property(
+                fc.integer({ min: 1, max: 20 }),
+                fc.array(fc.string({ minLength: 1, maxLength: 50 }), {
+                    minLength: 0,
+                    maxLength: 50,
+                }),
+                (maxSize, keys) => {
+                    const cache = new PreparedStatementCache(maxSize);
+                    for (const key of keys) {
+                        cache.set(key, makeStmt());
+                    }
+                    expect(cache.size).toBeLessThanOrEqual(maxSize);
+                }
+            )
+        );
+    });
+});

packages/persistence/database/db-sqlite/src/cache/cache.ts

@@ -0,0 +1,126 @@
+import { metrics } from "@opentelemetry/api";
+
+const DEFAULT_MAX_SIZE = 128;
+
+let cacheInstruments:
+    | {
+          hits: ReturnType<
+              ReturnType<typeof metrics.getMeter>["createCounter"]
+          >;
+          misses: ReturnType<
+              ReturnType<typeof metrics.getMeter>["createCounter"]
+          >;
+          evictions: ReturnType<
+              ReturnType<typeof metrics.getMeter>["createCounter"]
+          >;
+      }
+    | undefined;
+
+function getCacheInstruments(): typeof cacheInstruments & object {
+    if (cacheInstruments !== undefined) return cacheInstruments;
+    const meter = metrics.getMeter("@suaveplan/db-sqlite");
+    cacheInstruments = {
+        hits: meter.createCounter("sqlite.cache.hits", {
+            description: "Number of prepared-statement cache hits",
+        }),
+        misses: meter.createCounter("sqlite.cache.misses", {
+            description: "Number of prepared-statement cache misses",
+        }),
+        evictions: meter.createCounter("sqlite.cache.evictions", {
+            description: "Number of prepared-statement cache evictions",
+        }),
+    };
+    return cacheInstruments;
+}
+
+export interface CacheEntry {
+    // biome-ignore lint/suspicious/noExplicitAny: bun:sqlite Statement type varies by environment
+    stmt: any;
+    key: string;
+}
+
+export class PreparedStatementCache {
+    readonly #maxSize: number;
+    readonly #entries = new Map<string, CacheEntry>();
+    readonly #lruOrder: string[] = [];
+
+    constructor(maxSize: number = DEFAULT_MAX_SIZE) {
+        this.#maxSize = maxSize;
+    }
+
+    // biome-ignore lint/suspicious/noExplicitAny: bun:sqlite Statement type varies by environment
+    get(sql: string): any | undefined {
+        const entry = this.#entries.get(sql);
+        if (entry === undefined) {
+            getCacheInstruments().misses.add(1);
+            return undefined;
+        }
+        // Move to most-recently-used position
+        const idx = this.#lruOrder.indexOf(sql);
+        if (idx !== -1) {
+            this.#lruOrder.splice(idx, 1);
+        }
+        this.#lruOrder.push(sql);
+        getCacheInstruments().hits.add(1);
+        return entry.stmt;
+    }
+
+    // biome-ignore lint/suspicious/noExplicitAny: bun:sqlite Statement type varies by environment
+    set(sql: string, stmt: any): void {
+        if (this.#entries.has(sql)) {
+            // Update existing — refresh LRU position
+            const idx = this.#lruOrder.indexOf(sql);
+            if (idx !== -1) {
+                this.#lruOrder.splice(idx, 1);
+            }
+            this.#lruOrder.push(sql);
+            this.#entries.set(sql, { stmt, key: sql });
+            return;
+        }
+
+        if (this.#entries.size >= this.#maxSize) {
+            // Evict least-recently-used
+            const lru = this.#lruOrder.shift();
+            if (lru !== undefined) {
+                const evicted = this.#entries.get(lru);
+                this.#entries.delete(lru);
+                if (evicted !== undefined) {
+                    try {
+                        evicted.stmt.finalize?.();
+                    } catch {
+                        // ignore finalize errors
+                    }
+                    getCacheInstruments().evictions.add(1);
+                }
+            }
+        }
+
+        this.#entries.set(sql, { stmt, key: sql });
+        this.#lruOrder.push(sql);
+    }
+
+    invalidate(): void {
+        for (const entry of this.#entries.values()) {
+            try {
+                entry.stmt.finalize?.();
+            } catch {
+                // ignore finalize errors
+            }
+        }
+        this.#entries.clear();
+        this.#lruOrder.length = 0;
+    }
+
+    get size(): number {
+        return this.#entries.size;
+    }
+
+    get maxSize(): number {
+        return this.#maxSize;
+    }
+
+    /** Resets the OTel instruments singleton (for test isolation). */
+    static resetInstruments(): void {
+        cacheInstruments = undefined;
+    }
+}

packages/persistence/database/db-sqlite/src/cache/index.ts

@@ -0,0 +1,2 @@
+export type { CacheEntry } from "./cache.js";
+export { PreparedStatementCache } from "./cache.js";

packages/persistence/database/db-sqlite/src/conformance/bun-conformance.test.ts

@@ -0,0 +1,8 @@
+import { createBunDriver } from "../drivers/bun-driver.js";
+import { runConformanceSuite } from "./conformance-suite.js";
+
+runConformanceSuite("Bun driver", {
+    async create() {
+        return createBunDriver({ filename: ":memory:" });
+    },
+});

packages/persistence/database/db-sqlite/src/conformance/conformance-suite.md

@@ -0,0 +1,64 @@
+# conformance-suite
+
+<!-- begin:auto-docs -->
+_(no submodules)_
+<!-- end:auto-docs -->
+## Purpose
+
+Provides `runConformanceSuite`, a driver-agnostic test factory that accepts a `DriverFactory` callback and executes a standard suite of CRUD, transaction, and rollback assertions against any SQLite driver. Running the same suite against both the Bun driver and a WASM driver ensures that both runtimes satisfy the same behavioural contract, catching driver-specific regressions before they reach production.
+
+The suite is intentionally minimal — it tests the lowest-level SQL operations that the adapter layer depends on. Higher-level tests (prepared-statement cache behaviour, migration runner idempotency, OTel counter increments) live in their respective unit test files.
+
+## Features
+
+- `runConformanceSuite(name, factory)` — registers a Vitest `describe` block named `${name} conformance`
+- Tests: table creation, SELECT, INSERT with parameters, transaction commit, transaction rollback, UPDATE, DELETE
+- `DriverFactory` interface — a single `create()` method returning `{ sqlite, close }`
+- Runs under the Bun driver via `bun-conformance.test.ts`
+
+## Usage: Basic Example
+
+```ts
+import { runConformanceSuite } from "@suaveplan/db-sqlite/src/conformance/conformance-suite";
+import { createBunDriver } from "@suaveplan/db-sqlite/drivers/bun-driver";
+
+runConformanceSuite("Bun driver", {
+  async create() {
+    return createBunDriver({ filename: ":memory:" });
+  },
+});
+```
+
+## Usage: Advanced Example
+
+```ts
+import { runConformanceSuite } from "@suaveplan/db-sqlite/src/conformance/conformance-suite";
+
+// Custom driver shim for testing
+runConformanceSuite("Custom driver", {
+  async create() {
+    const driver = await MyCustomDriver.open(":memory:");
+    return { sqlite: driver.raw, close: async () => driver.close() };
+  },
+});
+```
+
+## API Reference
+
+### `DriverFactory`
+
+```ts
+interface DriverFactory {
+  create(): Promise<{ sqlite: any; close: () => Promise<void> }>;
+}
+```
+
+### `runConformanceSuite(name: string, factory: DriverFactory): void`
+
+Registers a Vitest `describe` block with 5 test cases covering the core SQLite contract.
+
+## Implementation Notes
+
+The conformance suite uses raw `sqlite.run()` / `sqlite.query().all()` calls rather than going through `SqliteAdapter` or Drizzle. This keeps the suite focused on driver-level semantics rather than adapter-layer concerns, making it useful for validating new driver implementations independently of the adapter code.
+
+Each test creates fresh tables with unique names to avoid interference between tests within the same suite run.

packages/persistence/database/db-sqlite/src/conformance/conformance-suite.ts

@@ -0,0 +1,116 @@
+import { describe, expect, it } from "@suaveplan/testing/runner";
+
+export interface DriverFactory {
+    // biome-ignore lint/suspicious/noExplicitAny: driver shape varies by runtime
+    create(): Promise<{ sqlite: any; close: () => Promise<void> }>;
+}
+
+/**
+ * Driver-agnostic conformance test suite. Accepts a DriverFactory and runs
+ * a standard set of CRUD, transaction, and cache-behaviour assertions that
+ * every SQLite driver must satisfy.
+ */
+export function runConformanceSuite(
+    name: string,
+    factory: DriverFactory
+): void {
+    describe(`${name} conformance`, () => {
+        it("can create and query a table", { timeout: 30000 }, async () => {
+            const { sqlite, close } = await factory.create();
+            try {
+                sqlite.run(
+                    "CREATE TABLE conf_users (id INTEGER PRIMARY KEY, name TEXT NOT NULL)"
+                );
+                sqlite.run("INSERT INTO conf_users VALUES (1, 'Alice')");
+                sqlite.run("INSERT INTO conf_users VALUES (2, 'Bob')");
+                const rows = sqlite
+                    .query("SELECT name FROM conf_users ORDER BY id")
+                    .all() as { name: string }[];
+                expect(rows.map((r) => r.name)).toEqual(["Alice", "Bob"]);
+            } finally {
+                await close();
+            }
+        });
+
+        it("transaction commits all inserts on success", {
+            timeout: 30000,
+        }, async () => {
+            const { sqlite, close } = await factory.create();
+            try {
+                sqlite.run("CREATE TABLE conf_tx (id INTEGER PRIMARY KEY)");
+                sqlite.run("BEGIN IMMEDIATE");
+                sqlite.run("INSERT INTO conf_tx VALUES (1)");
+                sqlite.run("INSERT INTO conf_tx VALUES (2)");
+                sqlite.run("COMMIT");
+                const rows = sqlite.query("SELECT id FROM conf_tx").all() as {
+                    id: number;
+                }[];
+                expect(rows).toHaveLength(2);
+            } finally {
+                await close();
+            }
+        });
+
+        it("transaction rolls back on failure", {
+            timeout: 30000,
+        }, async () => {
+            const { sqlite, close } = await factory.create();
+            try {
+                sqlite.run(
+                    "CREATE TABLE conf_rollback (id INTEGER PRIMARY KEY)"
+                );
+                sqlite.run("BEGIN IMMEDIATE");
+                sqlite.run("INSERT INTO conf_rollback VALUES (1)");
+                sqlite.run("ROLLBACK");
+                const rows = sqlite.query("SELECT id FROM conf_rollback").all();
+                expect(rows).toHaveLength(0);
+            } finally {
+                await close();
+            }
+        });
+
+        it("supports parameterised queries", {
+            timeout: 30000,
+        }, async () => {
+            const { sqlite, close } = await factory.create();
+            try {
+                sqlite.run(
+                    "CREATE TABLE conf_params (id INTEGER PRIMARY KEY, val TEXT)"
+                );
+                sqlite.run("INSERT INTO conf_params VALUES (?, ?)", [
+                    1,
+                    "hello",
+                ]);
+                const row = sqlite
+                    .query("SELECT val FROM conf_params WHERE id = ?")
+                    .get([1]) as { val: string } | null;
+                expect(row?.val).toBe("hello");
+            } finally {
+                await close();
+            }
+        });
+
+        it("can update and delete rows", { timeout: 30000 }, async () => {
+            const { sqlite, close } = await factory.create();
+            try {
+                sqlite.run(
+                    "CREATE TABLE conf_ud (id INTEGER PRIMARY KEY, val TEXT)"
+                );
+                sqlite.run("INSERT INTO conf_ud VALUES (1, 'a')");
+                sqlite.run("UPDATE conf_ud SET val = ? WHERE id = ?", ["b", 1]);
+                const updated = sqlite
+                    .query("SELECT val FROM conf_ud WHERE id = 1")
+                    .get() as { val: string } | null;
+                expect(updated?.val).toBe("b");
+
+                sqlite.run("DELETE FROM conf_ud WHERE id = ?", [1]);
+                const deleted = sqlite
+                    .query("SELECT 1 FROM conf_ud WHERE id = 1")
+                    .get();
+                expect(deleted).toBeNull();
+            } finally {
+                await close();
+            }
+        });
+    });
+}

packages/persistence/database/db-sqlite/src/connection/connection.md

@@ -0,0 +1,83 @@
+# connection
+
+<!-- begin:auto-docs -->
+_(no submodules)_
+<!-- end:auto-docs -->
+## Purpose
+
+Provides thin singleton-management wrappers for `SqliteAdapter`, built on top of the `@suaveplan/db` singleton helpers. These functions let callers share a single connected `SqliteAdapter` instance across an application without manually tracking the singleton lifecycle or passing the adapter through every layer of the call stack.
+
+The helpers default the singleton name to `"default"` so simple applications need only call `getDefaultSqlite()` with no arguments. More complex applications with multiple databases use explicit names.
+
+## Features
+
+- `getDefaultSqlite(options?, config?, name?)` — creates-or-returns a connected `SqliteAdapter` singleton
+- `closeSqlite(name?)` — disconnects and removes the named singleton
+- `closeAllSqlite()` — disconnects and removes all `SqliteAdapter` singletons
+- `hasSqlite(name?)` — returns `true` if the named singleton exists and is connected
+- Default name: `"default"` — single-database apps never need to supply a name
+
+## Usage: Basic Example
+
+```ts
+import { getDefaultSqlite } from "@suaveplan/db-sqlite/connection/connection";
+
+const adapter = await getDefaultSqlite();
+const rows = await adapter.query("SELECT * FROM users");
+```
+
+## Usage: Advanced Example
+
+```ts
+import {
+  closeAllSqlite,
+  closeSqlite,
+  getDefaultSqlite,
+  hasSqlite,
+} from "@suaveplan/db-sqlite/connection/connection";
+
+// Primary database
+const primary = await getDefaultSqlite(
+  { filename: "/data/app.db" },
+  undefined,
+  "primary"
+);
+
+// Analytics read-only shard
+const analytics = await getDefaultSqlite(
+  { filename: "/data/analytics.db", readonly: true },
+  undefined,
+  "analytics"
+);
+
+console.log(hasSqlite("primary"));   // true
+console.log(hasSqlite("analytics")); // true
+
+await closeSqlite("analytics");
+console.log(hasSqlite("analytics")); // false
+
+// Shutdown — closes all remaining singletons
+await closeAllSqlite();
+```
+
+## API Reference
+
+### `getDefaultSqlite(options?, config?, name?): Promise<SqliteAdapter>`
+
+Creates a new `SqliteAdapter` using the given `options`, calls `connect(config)` on it, caches it under `name`, and returns it. Subsequent calls with the same `name` return the cached instance without reconnecting.
+
+### `closeSqlite(name?): Promise<void>`
+
+Disconnects and removes the singleton named `name`. No-op if no singleton by that name exists.
+
+### `closeAllSqlite(): Promise<void>`
+
+Disconnects and removes all singletons. Throws `AggregateError` if any disconnect fails.
+
+### `hasSqlite(name?): boolean`
+
+Returns `true` if a singleton exists under `name`.
+
+## Implementation Notes
+
+These functions delegate entirely to `@suaveplan/db`'s `getSingleton`, `closeSingleton`, `closeAllSingletons`, and `hasSingleton`. The `SqliteAdapter`-specific names (`getDefaultSqlite`, `closeSqlite`, etc.) exist for discoverability — callers working with SQLite need not know the generic singleton API. The return type is narrowed from `DatabaseAdapter` to `SqliteAdapter` via a cast so callers have access to SQLite-specific properties.

packages/persistence/database/db-sqlite/src/connection/connection.test.ts

@@ -0,0 +1,102 @@
+import { describe, expect, it } from "@suaveplan/testing/runner";
+import { SqliteAdapter } from "../adapter/adapter.js";
+import {
+    closeAllSqlite,
+    closeSqlite,
+    getDefaultSqlite,
+    hasSqlite,
+} from "./connection.js";
+
+// Use unique name prefixes to avoid cross-test bleed with the module-level registry
+const PREFIX = "__connection_test__";
+let counter = 0;
+function uniqName(): string {
+    return `${PREFIX}${counter++}`;
+}
+
+describe("getDefaultSqlite", () => {
+    it("creates and connects an adapter on first call", {
+        timeout: 30000,
+    }, async () => {
+        const name = uniqName();
+        const adapter = await getDefaultSqlite(undefined, undefined, name);
+        try {
+            expect(adapter).toBeInstanceOf(SqliteAdapter);
+            expect(adapter.isConnected).toBe(true);
+        } finally {
+            await closeSqlite(name);
+        }
+    });
+
+    it("returns same instance on second call", {
+        timeout: 30000,
+    }, async () => {
+        const name = uniqName();
+        const a1 = await getDefaultSqlite(undefined, undefined, name);
+        const a2 = await getDefaultSqlite(undefined, undefined, name);
+        try {
+            expect(a1).toBe(a2);
+        } finally {
+            await closeSqlite(name);
+        }
+    });
+});
+
+describe("hasSqlite", () => {
+    it("returns false before getDefaultSqlite", { timeout: 5000 }, () => {
+        expect(hasSqlite(uniqName())).toBe(false);
+    });
+
+    it("returns true after getDefaultSqlite", {
+        timeout: 30000,
+    }, async () => {
+        const name = uniqName();
+        await getDefaultSqlite(undefined, undefined, name);
+        try {
+            expect(hasSqlite(name)).toBe(true);
+        } finally {
+            await closeSqlite(name);
+        }
+    });
+
+    it("returns false after closeSqlite", {
+        timeout: 30000,
+    }, async () => {
+        const name = uniqName();
+        await getDefaultSqlite(undefined, undefined, name);
+        await closeSqlite(name);
+        expect(hasSqlite(name)).toBe(false);
+    });
+});
+
+describe("closeSqlite", () => {
+    it("disconnects and removes adapter from registry", {
+        timeout: 30000,
+    }, async () => {
+        const name = uniqName();
+        const adapter = await getDefaultSqlite(undefined, undefined, name);
+        await closeSqlite(name);
+        expect(adapter.isConnected).toBe(false);
+        expect(hasSqlite(name)).toBe(false);
+    });
+
+    it("is a no-op for unregistered name", { timeout: 30000 }, async () => {
+        await expect(closeSqlite(uniqName())).resolves.toBeUndefined();
+    });
+});
+
+describe("closeAllSqlite", () => {
+    it("disconnects all adapters and clears registry", {
+        timeout: 30000,
+    }, async () => {
+        const name1 = uniqName();
+        const name2 = uniqName();
+        const a = await getDefaultSqlite(undefined, undefined, name1);
+        const b = await getDefaultSqlite(undefined, undefined, name2);
+        await closeAllSqlite();
+        expect(a.isConnected).toBe(false);
+        expect(b.isConnected).toBe(false);
+        expect(hasSqlite(name1)).toBe(false);
+        expect(hasSqlite(name2)).toBe(false);
+    });
+});

packages/persistence/database/db-sqlite/src/connection/connection.ts

@@ -0,0 +1,37 @@
+import type { DatabaseConfig } from "@suaveplan/db";
+import {
+    closeAllSingletons,
+    closeSingleton,
+    getSingleton,
+    hasSingleton,
+} from "@suaveplan/db/connection/singleton";
+import { SqliteAdapter } from "../adapter/adapter.js";
+import type { SqliteAdapterOptions } from "../schemas/index.js";
+
+const DEFAULT_SQLITE_NAME = "default";
+
+export async function getDefaultSqlite(
+    options?: SqliteAdapterOptions,
+    config?: Partial<DatabaseConfig>,
+    name: string = DEFAULT_SQLITE_NAME
+): Promise<SqliteAdapter> {
+    return getSingleton(
+        name,
+        () => new SqliteAdapter(options),
+        config
+    ) as Promise<SqliteAdapter>;
+}
+
+export async function closeSqlite(
+    name: string = DEFAULT_SQLITE_NAME
+): Promise<void> {
+    return closeSingleton(name);
+}
+
+export async function closeAllSqlite(): Promise<void> {
+    return closeAllSingletons();
+}
+
+export function hasSqlite(name: string = DEFAULT_SQLITE_NAME): boolean {
+    return hasSingleton(name);
+}

packages/persistence/database/db-sqlite/src/connection/index.ts

@@ -0,0 +1,6 @@
+export {
+    closeAllSqlite,
+    closeSqlite,
+    getDefaultSqlite,
+    hasSqlite,
+} from "./connection.js";

packages/persistence/database/db-sqlite/src/drivers/bun-driver.md

@@ -0,0 +1,81 @@
+# bun-driver
+
+## Purpose
+
+Provides `createBunDriver`, the server-side SQLite driver for `@suaveplan/db-sqlite`. It dynamically imports `bun:sqlite` (a built-in Bun module) and returns a thin wrapper holding the raw `Database` instance plus an idempotent `close()` function. The `isBunEnvironment()` guard ensures the driver is never accidentally called in a browser context — doing so raises `SQLITE.ENVIRONMENT_ERROR` immediately rather than surfacing a confusing module-not-found error at import time.
+
+The dynamic `import("bun:sqlite")` pattern keeps the module evaluatable in non-Bun environments (so bundlers can tree-shake it out and browser builds do not fail), while still providing full type information from `@types/bun`.
+
+## Features
+
+- `createBunDriver(options?)` — opens an in-memory (default) or file-backed SQLite database via `bun:sqlite`
+- `isBunEnvironment()` — detects Bun runtime via `process.versions.bun`
+- `BunDriverResult` — `{ sqlite, close }` shape; `close()` is idempotent (safe to call multiple times)
+- Throws `SqliteError(SQLITE.ENVIRONMENT_ERROR)` when called outside Bun
+- Throws `SqliteError(SQLITE.DRIVER_INIT_FAILED)` if `Database` constructor throws (e.g. bad path, locked file)
+- `readonly` option forwarded to `bun:sqlite` `Database` constructor
+
+## Usage: Basic Example
+
+```ts
+import { createBunDriver } from "@suaveplan/db-sqlite/drivers/bun-driver";
+
+const { sqlite, close } = await createBunDriver();
+// sqlite is a bun:sqlite Database instance — run raw SQL or pass to Drizzle
+await close();
+```
+
+## Usage: Advanced Example
+
+```ts
+import { createBunDriver, isBunEnvironment } from "@suaveplan/db-sqlite/drivers/bun-driver";
+
+if (!isBunEnvironment()) {
+  throw new Error("Server-side only path");
+}
+
+const { sqlite, close } = await createBunDriver({
+  filename: "/data/app.db",
+  readonly: false,
+});
+
+try {
+  sqlite.run("CREATE TABLE IF NOT EXISTS kv (key TEXT PRIMARY KEY, value TEXT)");
+  sqlite.run("INSERT OR REPLACE INTO kv VALUES (?, ?)", ["hello", "world"]);
+} finally {
+  await close(); // second call is a no-op
+  await close(); // safe
+}
+```
+
+## API Reference
+
+### `isBunEnvironment(): boolean`
+
+Returns `true` when `process.versions.bun` is defined. Safe to call in any environment.
+
+### `createBunDriver(options?: BunDriverOptions): Promise<BunDriverResult>`
+
+Opens a SQLite database. Throws `SqliteError(SQLITE.ENVIRONMENT_ERROR)` outside Bun, `SqliteError(SQLITE.DRIVER_INIT_FAILED)` on open failure.
+
+**Parameters**
+
+| Name | Type | Default | Description |
+|------|------|---------|-------------|
+| `options.filename` | `string` | `":memory:"` | File path or `":memory:"` |
+| `options.readonly` | `boolean` | `false` | Open in read-only mode |
+
+### `BunDriverResult`
+
+```ts
+interface BunDriverResult {
+  sqlite: Database;         // bun:sqlite Database instance
+  close: () => Promise<void>; // idempotent — safe to call multiple times
+}
+```
+
+## Implementation Notes
+
+`close()` sets a `closed` flag so repeated calls are no-ops rather than throwing "database already closed". This is intentional: callers cleaning up in `finally` blocks should not have to track whether they already closed.
+
+The `bun:sqlite` import is deferred via `await import("bun:sqlite")` inside the function body so that bundlers processing non-Bun targets (e.g. a Vite browser build) can externalize or ignore the module without causing a build error at parse time. The `isBunEnvironment()` guard before the import provides an early exit in the rare case this driver is invoked in a test environment that stubs the process object.

packages/persistence/database/db-sqlite/src/drivers/bun-driver.test.ts

@@ -0,0 +1,64 @@
+import { describe, expect, it } from "@suaveplan/testing/runner";
+import { createBunDriver, isBunEnvironment } from "./bun-driver.js";
+
+describe("isBunEnvironment", () => {
+    it("returns true under Bun test runner", { timeout: 5000 }, () => {
+        expect(isBunEnvironment()).toBe(true);
+    });
+});
+
+describe("createBunDriver", () => {
+    it("creates an in-memory database by default", {
+        timeout: 30000,
+    }, async () => {
+        const { sqlite, close } = await createBunDriver();
+        expect(sqlite).toBeDefined();
+        await close();
+    });
+
+    it("close() is idempotent", { timeout: 30000 }, async () => {
+        const { close } = await createBunDriver();
+        await close();
+        await expect(close()).resolves.toBeUndefined();
+    });
+
+    it("can run SQL after creation", { timeout: 30000 }, async () => {
+        const { sqlite, close } = await createBunDriver();
+        try {
+            sqlite.run("CREATE TABLE t (id INTEGER PRIMARY KEY, val TEXT)");
+            sqlite.run("INSERT INTO t VALUES (1, 'hello')");
+            const row = sqlite.query("SELECT val FROM t WHERE id = 1").get();
+            expect((row as { val: string }).val).toBe("hello");
+        } finally {
+            await close();
+        }
+    });
+
+    it("creates a file-backed database when filename provided", {
+        timeout: 30000,
+    }, async () => {
+        const path = `/tmp/db-sqlite-test-${Date.now()}.db`;
+        const { sqlite, close } = await createBunDriver({ filename: path });
+        try {
+            sqlite.run("CREATE TABLE IF NOT EXISTS ping (id INTEGER)");
+        } finally {
+            await close();
+        }
+        // Clean up
+        const { unlinkSync } = await import("node:fs");
+        try {
+            unlinkSync(path);
+        } catch {
+            // ignore if already gone
+        }
+    });
+
+    it("throws DRIVER_INIT_FAILED when path is in a nonexistent directory", {
+        timeout: 5000,
+    }, async () => {
+        const bad = "/nonexistent/dir/that/does/not/exist/db.sqlite";
+        await expect(createBunDriver({ filename: bad })).rejects.toMatchObject({
+            code: "SQLITE.DRIVER_INIT_FAILED",
+        });
+    });
+});

packages/persistence/database/db-sqlite/src/drivers/bun-driver.ts

@@ -0,0 +1,51 @@
+import { SQLITE_CODES, SqliteError } from "../errors/index.js";
+import type { BunDriverOptions } from "../schemas/index.js";
+
+export interface BunDriverResult {
+    // biome-ignore lint/suspicious/noExplicitAny: bun:sqlite Database type varies by environment
+    sqlite: any;
+    close: () => Promise<void>;
+}
+
+export function isBunEnvironment(): boolean {
+    return typeof Bun !== "undefined";
+}
+
+export async function createBunDriver(
+    options?: BunDriverOptions
+): Promise<BunDriverResult> {
+    /* c8 ignore next 5 */
+    if (!isBunEnvironment()) {
+        throw new SqliteError(
+            SQLITE_CODES.ENVIRONMENT_ERROR,
+            "createBunDriver requires Bun runtime — use createWasmDriver in browser environments"
+        );
+    }
+
+    let sqlite: BunDriverResult["sqlite"];
+    try {
+        const { Database } = await import("bun:sqlite");
+        const filename = options?.filename ?? ":memory:";
+        sqlite = new Database(filename, {
+            create: true,
+            readonly: options?.readonly ?? false,
+        });
+    } catch (err) {
+        throw new SqliteError(
+            SQLITE_CODES.DRIVER_INIT_FAILED,
+            `Failed to open SQLite database: ${err instanceof Error ? err.message : String(err)}`,
+            { cause: err instanceof Error ? err : undefined }
+        );
+    }
+
+    let closed = false;
+
+    return {
+        sqlite,
+        close: async () => {
+            if (closed) return;
+            closed = true;
+            sqlite.close();
+        },
+    };
+}

packages/persistence/database/db-sqlite/src/drivers/index.ts

@@ -0,0 +1,7 @@
+export type { BunDriverResult } from "./bun-driver.js";
+export {
+    createBunDriver,
+    isBunEnvironment,
+} from "./bun-driver.js";
+export type { WasmDriverResult, WasmProxyDb } from "./wasm-driver.js";
+export { createWasmDriver } from "./wasm-driver.js";

packages/persistence/database/db-sqlite/src/drivers/wasm-driver.md

@@ -0,0 +1,89 @@
+# wasm-driver
+
+## Purpose
+
+Provides `createWasmDriver`, the browser-side SQLite driver for `@suaveplan/db-sqlite`. It spawns a Web Worker running `wasm-worker.ts`, which loads `@sqlite.org/sqlite-wasm` and manages a SQLite database instance. Communication between the caller and the worker uses a message-passing protocol with sequential IDs mapped to `Promise` resolve/reject pairs, giving a fully async interface without blocking the main thread.
+
+OPFS (Origin Private File System) persistence is attempted automatically when a non-`:memory:` filename is supplied and the worker context supports `sqlite3.oo1.OpfsDb`. When OPFS headers (`Cross-Origin-Opener-Policy: same-origin`, `Cross-Origin-Embedder-Policy: require-corp`) are absent, the worker falls back to in-memory storage with a console warning.
+
+## Features
+
+- `createWasmDriver(options?, workerFactory?)` — spawns worker, awaits ready handshake, returns `{ db, close }`
+- Injectable `workerFactory` parameter for test isolation — avoids real Worker spawning in Vitest
+- `WasmProxyDb` — `{ query(sql, params?), execute(sql, params?) }` interface returned by the driver
+- `close()` is idempotent and drains all pending requests with rejection before terminating the worker
+- Worker init failure terminates the worker and throws `SqliteError(SQLITE.DRIVER_INIT_FAILED)`
+- Worker runtime errors reject all pending promises with `SqliteError(SQLITE.DRIVER_INIT_FAILED)`
+
+## Usage: Basic Example
+
+```ts
+import { createWasmDriver } from "@suaveplan/db-sqlite/drivers/wasm-driver";
+
+const { db, close } = await createWasmDriver();
+await db.execute("CREATE TABLE kv (key TEXT PRIMARY KEY, value TEXT)", []);
+await db.execute("INSERT INTO kv VALUES (?, ?)", ["hello", "world"]);
+const rows = await db.query("SELECT * FROM kv WHERE key = ?", ["hello"]);
+await close();
+```
+
+## Usage: Advanced Example
+
+```ts
+import { createWasmDriver } from "@suaveplan/db-sqlite/drivers/wasm-driver";
+
+// With OPFS persistence (requires COOP/COEP headers on the page)
+const { db, close } = await createWasmDriver({ filename: "app.db" });
+
+try {
+  await db.execute("BEGIN IMMEDIATE", []);
+  await db.execute("INSERT INTO users VALUES (?, ?)", [1, "Alice"]);
+  await db.execute("COMMIT", []);
+} catch (err) {
+  await db.execute("ROLLBACK", []);
+  throw err;
+} finally {
+  await close();
+}
+```
+
+## API Reference
+
+### `createWasmDriver<TSchema>(options?, workerFactory?): Promise<WasmDriverResult<TSchema>>`
+
+Spawns the WASM worker and awaits the `ready` handshake before resolving.
+
+**Parameters**
+
+| Name | Type | Default | Description |
+|------|------|---------|-------------|
+| `options.filename` | `string` | `undefined` (→ `:memory:`) | OPFS file path or omit for in-memory |
+| `workerFactory` | `() => Worker` | `defaultWorkerFactory` | Injectable for testing |
+
+**Throws** `SqliteError(SQLITE.DRIVER_INIT_FAILED)` if the worker fails to initialise.
+
+### `WasmProxyDb<TSchema>`
+
+```ts
+interface WasmProxyDb<TSchema> {
+  query(sql: string, params?: unknown[]): Promise<unknown[][]>;
+  execute(sql: string, params?: unknown[]): Promise<{ rowsAffected: number }>;
+}
+```
+
+### `WasmDriverResult<TSchema>`
+
+```ts
+interface WasmDriverResult<TSchema> {
+  db: WasmProxyDb<TSchema>;
+  close: () => Promise<void>;
+}
+```
+
+## Implementation Notes
+
+The worker URL is constructed with `new URL("./wasm-worker.js", import.meta.url)` so bundlers (Vite, webpack) can resolve it as a worker entry point and emit the correct asset path. The `.js` extension (not `.ts`) is used because the compiled output is what the browser loads at runtime.
+
+The pending-promise map (`Map<id, {resolve, reject}>`) ensures that each in-flight request receives exactly one response, and that a stale response for a cancelled request is silently ignored. On `close()`, all pending promises are rejected before worker termination to prevent callers from hanging indefinitely.
+
+OPFS support requires `Cross-Origin-Opener-Policy: same-origin` and `Cross-Origin-Embedder-Policy: require-corp` response headers. The worker automatically falls back to in-memory storage without these headers rather than crashing, since detecting header presence from inside a Worker is unreliable.

packages/persistence/database/db-sqlite/src/drivers/wasm-driver.test.ts

@@ -0,0 +1,202 @@
+import { describe, expect, it, vi } from "@suaveplan/testing/runner";
+import { SqliteError } from "../errors/index.js";
+import { createWasmDriver } from "./wasm-driver.js";
+
+// Injectable worker factory avoids spawning real Workers in Node/Vitest environment
+function makeWorkerFactory(
+    handler: (
+        msg: unknown,
+        post: (data: unknown) => void
+    ) => void | Promise<void>
+): () => Worker {
+    return () => {
+        let onmessage: ((ev: MessageEvent) => void) | null = null;
+        let onerror: ((ev: ErrorEvent) => void) | null = null;
+
+        const post = (data: unknown) => {
+            if (onmessage) {
+                onmessage({ data } as MessageEvent);
+            }
+        };
+
+        const worker = {
+            get onmessage() {
+                return onmessage;
+            },
+            set onmessage(fn: ((ev: MessageEvent) => void) | null) {
+                onmessage = fn;
+            },
+            get onerror() {
+                return onerror;
+            },
+            set onerror(fn: ((ev: ErrorEvent) => void) | null) {
+                onerror = fn;
+            },
+            postMessage: (msg: unknown) => {
+                void Promise.resolve().then(() => handler(msg, post));
+            },
+            terminate: vi.fn(),
+        };
+
+        return worker as unknown as Worker;
+    };
+}
+
+function makeSuccessWorker(): () => Worker {
+    return makeWorkerFactory((msg, post) => {
+        const m = msg as {
+            type: string;
+            id: number;
+            sql?: string;
+            params?: unknown[];
+        };
+        if (m.type === "init") {
+            post({ id: m.id, ok: true, result: { type: "ready" } });
+        } else if (m.type === "query") {
+            post({ id: m.id, ok: true, result: [["value1"], ["value2"]] });
+        } else if (m.type === "execute") {
+            post({ id: m.id, ok: true, result: { rowsAffected: 1 } });
+        } else if (m.type === "close") {
+            post({ id: m.id, ok: true, result: { type: "closed" } });
+        }
+    });
+}
+
+describe("createWasmDriver", () => {
+    it("creates driver and resolves on successful init", {
+        timeout: 30000,
+    }, async () => {
+        const { db, close } = await createWasmDriver(
+            undefined,
+            makeSuccessWorker()
+        );
+        expect(db).toBeDefined();
+        await close();
+    });
+
+    it("query returns rows from worker", { timeout: 30000 }, async () => {
+        const { db, close } = await createWasmDriver(
+            undefined,
+            makeSuccessWorker()
+        );
+        const rows = await db.query("SELECT * FROM t");
+        expect(rows).toEqual([["value1"], ["value2"]]);
+        await close();
+    });
+
+    it("execute returns rowsAffected from worker", {
+        timeout: 30000,
+    }, async () => {
+        const { db, close } = await createWasmDriver(
+            undefined,
+            makeSuccessWorker()
+        );
+        const result = await db.execute("INSERT INTO t VALUES (?)", [1]);
+        expect(result.rowsAffected).toBe(1);
+        await close();
+    });
+
+    it("close() is idempotent", { timeout: 30000 }, async () => {
+        const { close } = await createWasmDriver(
+            undefined,
+            makeSuccessWorker()
+        );
+        await close();
+        await expect(close()).resolves.toBeUndefined();
+    });
+
+    it("rejects pending requests when close() is called", {
+        timeout: 30000,
+    }, async () => {
+        let postFn: ((data: unknown) => void) | null = null;
+
+        const slowWorker = makeWorkerFactory((msg, post) => {
+            const m = msg as { type: string; id: number };
+            if (m.type === "init") {
+                post({ id: m.id, ok: true, result: { type: "ready" } });
+            } else if (m.type === "close") {
+                post({ id: m.id, ok: true, result: { type: "closed" } });
+            }
+            // query messages hang — capture postFn for manual resolution
+            if (m.type === "query") {
+                postFn = post;
+            }
+        });
+
+        const { db, close } = await createWasmDriver(undefined, slowWorker);
+
+        // Fire a query that will hang — capture the promise
+        const queryPromise = db.query("SELECT 1");
+        // Ensure the query is actually sent before closing
+        await Promise.resolve();
+
+        // close() should drain pending
+        await close();
+
+        // The hanging query should now reject
+        await expect(queryPromise).rejects.toBeInstanceOf(SqliteError);
+
+        // Suppress unused variable warning
+        void postFn;
+    });
+
+    it("throws SqliteError on worker init failure", {
+        timeout: 30000,
+    }, async () => {
+        const failWorker = makeWorkerFactory((msg, post) => {
+            const m = msg as { type: string; id: number };
+            if (m.type === "init") {
+                post({
+                    id: m.id,
+                    ok: false,
+                    error: "sqlite-wasm init failed: load error",
+                });
+            } else if (m.type === "close") {
+                post({ id: m.id, ok: true, result: { type: "closed" } });
+            }
+        });
+
+        await expect(
+            createWasmDriver(undefined, failWorker)
+        ).rejects.toBeInstanceOf(SqliteError);
+        await expect(
+            createWasmDriver(undefined, failWorker)
+        ).rejects.toMatchObject({ code: "SQLITE.DRIVER_INIT_FAILED" });
+    });
+
+    it("worker error event rejects pending requests", {
+        timeout: 30000,
+    }, async () => {
+        let fireError: ((ev: ErrorEvent) => void) | null = null;
+
+        const hangingWorker = makeWorkerFactory((msg, post) => {
+            const m = msg as { type: string; id: number };
+            if (m.type === "init") {
+                post({ id: m.id, ok: true, result: { type: "ready" } });
+            }
+            // query messages hang — worker "crashes" below
+        });
+
+        const patchedFactory = () => {
+            const worker = hangingWorker();
+            Object.defineProperty(worker, "onerror", {
+                set: (fn: (ev: ErrorEvent) => void) => {
+                    fireError = fn;
+                },
+                get: () => fireError,
+                configurable: true,
+            });
+            return worker;
+        };
+
+        const { db } = await createWasmDriver(undefined, patchedFactory);
+
+        const queryPromise = db.query("SELECT 1");
+        await Promise.resolve();
+
+        // Simulate worker crash — onerror should reject all pending promises
+        fireError?.({ message: "Worker crashed" } as ErrorEvent);
+
+        await expect(queryPromise).rejects.toBeInstanceOf(SqliteError);
+    });
+});

packages/persistence/database/db-sqlite/src/drivers/wasm-driver.ts

@@ -0,0 +1,132 @@
+import { SQLITE_CODES, SqliteError } from "../errors/index.js";
+import type { WasmDriverOptions } from "../schemas/index.js";
+
+export interface WasmDriverResult<TSchema = Record<string, never>> {
+    db: WasmProxyDb<TSchema>;
+    close: () => Promise<void>;
+}
+
+export interface WasmProxyDb<_TSchema = Record<string, never>> {
+    query: (sql: string, params?: unknown[]) => Promise<unknown[][]>;
+    execute: (
+        sql: string,
+        params?: unknown[]
+    ) => Promise<{ rowsAffected: number }>;
+}
+
+type WorkerFactory = () => Worker;
+
+interface WorkerResponse {
+    id: number;
+    ok: boolean;
+    result?: unknown;
+    error?: string;
+}
+
+function defaultWorkerFactory(): Worker {
+    return new Worker(new URL("./wasm-worker.js", import.meta.url), {
+        type: "module",
+    });
+}
+
+export async function createWasmDriver<TSchema = Record<string, never>>(
+    options?: WasmDriverOptions,
+    workerFactory: WorkerFactory = defaultWorkerFactory
+): Promise<WasmDriverResult<TSchema>> {
+    const worker = workerFactory();
+    const pending = new Map<
+        number,
+        { resolve: (v: unknown) => void; reject: (e: Error) => void }
+    >();
+    let nextId = 1;
+
+    worker.onmessage = (event: MessageEvent<WorkerResponse>) => {
+        const { id, ok, result, error } = event.data;
+        const p = pending.get(id);
+        if (p === undefined) return;
+        pending.delete(id);
+        if (ok) {
+            p.resolve(result);
+        } else {
+            p.reject(
+                new SqliteError(
+                    SQLITE_CODES.QUERY_FAILED,
+                    error ?? "Unknown worker error"
+                )
+            );
+        }
+    };
+
+    worker.onerror = (event: ErrorEvent) => {
+        const msg = event.message ?? "Worker error";
+        for (const [id, p] of pending) {
+            pending.delete(id);
+            p.reject(new SqliteError(SQLITE_CODES.DRIVER_INIT_FAILED, msg));
+        }
+    };
+
+    function send<T>(
+        type: string,
+        extra?: Record<string, unknown>
+    ): Promise<T> {
+        return new Promise<T>((resolve, reject) => {
+            const id = nextId++;
+            pending.set(id, {
+                resolve: resolve as (v: unknown) => void,
+                reject,
+            });
+            worker.postMessage({ type, id, ...extra });
+        });
+    }
+
+    // Initialise the worker — await ready handshake
+    try {
+        await send("init", { filename: options?.filename });
+    } catch (err) {
+        worker.terminate();
+        throw new SqliteError(
+            SQLITE_CODES.DRIVER_INIT_FAILED,
+            `WASM driver init failed: ${err instanceof Error ? err.message : String(err)}`,
+            { cause: err instanceof Error ? err : undefined }
+        );
+    }
+
+    const db: WasmProxyDb<TSchema> = {
+        query: async (sql, params) => {
+            const rows = await send<unknown[][]>("query", { sql, params });
+            return rows;
+        },
+        execute: async (sql, params) => {
+            const result = await send<{ rowsAffected: number }>("execute", {
+                sql,
+                params,
+            });
+            return result;
+        },
+    };
+
+    let closed = false;
+
+    const close = async (): Promise<void> => {
+        if (closed) return;
+        closed = true;
+        // Drain pending with rejection
+        for (const [id, p] of pending) {
+            pending.delete(id);
+            p.reject(
+                new SqliteError(
+                    SQLITE_CODES.NOT_CONNECTED,
+                    "Driver closed while request was pending"
+                )
+            );
+        }
+        try {
+            await send("close");
+        } catch {
+            // ignore close errors
+        }
+        worker.terminate();
+    };
+
+    return { db, close };
+}

packages/persistence/database/db-sqlite/src/drivers/wasm-worker.md

@@ -0,0 +1,81 @@
+# wasm-worker
+
+## Purpose
+
+Web Worker implementation for the WASM SQLite driver. This module runs inside a dedicated worker thread created by `createWasmDriver` and handles all direct SQLite operations using `@sqlite.org/sqlite-wasm`. It communicates with the main thread via a simple message-passing protocol, keeping the WASM heap and SQLite connection completely isolated from the main thread's event loop.
+
+Running SQLite operations in a worker prevents blocking the UI thread during expensive queries and migrations, and satisfies browser restrictions around synchronous WASM I/O on the main thread (required for OPFS-backed databases via `sqlite3_vfs`).
+
+## Features
+
+- Loads `@sqlite.org/sqlite-wasm` lazily on `init` message
+- Supports `init`, `query`, `execute`, `begin_tx`, `commit_tx`, `rollback_tx`, and `close` message types
+- Sequential request IDs for reliable request-response correlation
+- Returns structured `{ id, ok, result }` or `{ id, ok: false, error }` responses
+- Opens either an in-memory database (default) or a named database when `filename` is provided
+
+## Usage: Basic Example
+
+This module is not imported directly. It is instantiated by `createWasmDriver` as a Web Worker:
+
+```ts
+// Worker is created internally by the driver
+import { createWasmDriver } from "@suaveplan/db-sqlite/adapter";
+
+const { db, close } = await createWasmDriver();
+await db.execute("CREATE TABLE t (id INTEGER PRIMARY KEY)");
+const rows = await db.query("SELECT * FROM t");
+await close();
+```
+
+## Usage: Advanced Example
+
+For testing purposes, the worker's message protocol can be exercised directly by creating a mock worker that implements the same interface. The `createWasmDriver` function accepts an injectable `workerFactory` parameter for this:
+
+```ts
+import { createWasmDriver } from "@suaveplan/db-sqlite";
+
+function mockWorkerFactory(): Worker {
+    let onmessage: ((ev: MessageEvent) => void) | null = null;
+    const post = (data: unknown) => { if (onmessage) onmessage({ data } as MessageEvent); };
+
+    return {
+        set onmessage(fn) { onmessage = fn; },
+        postMessage(msg: unknown) {
+            const m = msg as { type: string; id: number };
+            if (m.type === "init") post({ id: m.id, ok: true, result: { type: "ready" } });
+            if (m.type === "query") post({ id: m.id, ok: true, result: [] });
+        },
+        terminate() {},
+    } as unknown as Worker;
+}
+
+const { db, close } = await createWasmDriver(undefined, mockWorkerFactory);
+```
+
+## API Reference
+
+### Message Protocol (inbound → worker)
+
+| `type`        | Extra fields               | Description                             |
+|---------------|----------------------------|-----------------------------------------|
+| `init`        | `filename?: string`        | Load WASM, open database, reply ready   |
+| `query`       | `sql: string`, `params?`   | Run `all()`, reply with rows array      |
+| `execute`     | `sql: string`, `params?`   | Run `run()`, reply with `rowsAffected`  |
+| `begin_tx`    | —                          | `BEGIN IMMEDIATE`                       |
+| `commit_tx`   | —                          | `COMMIT`                                |
+| `rollback_tx` | —                          | `ROLLBACK`                              |
+| `close`       | —                          | Close database, terminate worker        |
+
+### Message Protocol (outbound ← worker)
+
+All responses carry `{ id: number, ok: boolean }`.
+
+- Success: `{ id, ok: true, result: <payload> }`
+- Failure: `{ id, ok: false, error: "<message>" }`
+
+## Implementation Notes
+
+The `/// <reference lib="webworker" />` triple-slash directive at the top of the file provides TypeScript access to `self`, `MessageEvent`, `postMessage`, and other Web Worker globals without requiring the file to be compiled with `"lib": ["WebWorker"]` globally — that would pollute the non-worker files.
+
+The module uses the `@sqlite.org/sqlite-wasm` default export which is a zero-argument async factory: `const sqlite3 = await initSqlite()`. Previous versions of this package accepted a configuration argument; the current API does not.

packages/persistence/database/db-sqlite/src/drivers/wasm-worker.ts

@@ -0,0 +1,176 @@
+/// <reference lib="webworker" />
+/**
+ * Web Worker entry point for the @sqlite.org/sqlite-wasm driver.
+ * Spawned by wasm-driver.ts; handles init, query, execute, and close messages.
+ * Must not import any Node-only modules — runs in a browser Worker context.
+ */
+
+interface InitMessage {
+    type: "init";
+    id: number;
+    filename?: string;
+}
+
+interface QueryMessage {
+    type: "query";
+    id: number;
+    sql: string;
+    params?: unknown[];
+}
+
+interface ExecuteMessage {
+    type: "execute";
+    id: number;
+    sql: string;
+    params?: unknown[];
+}
+
+interface BeginTxMessage {
+    type: "begin_tx";
+    id: number;
+}
+
+interface CommitTxMessage {
+    type: "commit_tx";
+    id: number;
+}
+
+interface RollbackTxMessage {
+    type: "rollback_tx";
+    id: number;
+}
+
+interface CloseMessage {
+    type: "close";
+    id: number;
+}
+
+type WorkerMessage =
+    | InitMessage
+    | QueryMessage
+    | ExecuteMessage
+    | BeginTxMessage
+    | CommitTxMessage
+    | RollbackTxMessage
+    | CloseMessage;
+
+// biome-ignore lint/suspicious/noExplicitAny: sqlite OO1 API uses any
+let db: any = null;
+
+function postOk(id: number, result?: unknown): void {
+    self.postMessage({ id, ok: true, result });
+}
+
+function postErr(id: number, message: string): void {
+    self.postMessage({ id, ok: false, error: message });
+}
+
+function runSql(sql: string, bind: unknown[]): void {
+    // Using OO1 Database.exec() — this is sqlite3 OO1 API, not child_process
+    db.exec({ sql, bind });
+}
+
+function querySql(sql: string, bind: unknown[]): unknown[][] {
+    const rows: unknown[][] = [];
+    // Using OO1 Database.exec() — this is sqlite3 OO1 API, not child_process
+    db.exec({ sql, bind, resultRows: rows, rowMode: "array" });
+    return rows;
+}
+
+self.onmessage = async (event: MessageEvent<WorkerMessage>) => {
+    const msg = event.data;
+
+    if (msg.type === "init") {
+        try {
+            const initSqlite = (await import("@sqlite.org/sqlite-wasm"))
+                .default;
+            const sqlite3 = await initSqlite();
+
+            const filename = msg.filename ?? ":memory:";
+
+            if (
+                filename !== ":memory:" &&
+                typeof sqlite3.oo1.OpfsDb !== "undefined"
+            ) {
+                try {
+                    db = new sqlite3.oo1.OpfsDb(filename);
+                } catch {
+                    console.warn(
+                        "[wasm-worker] OPFS unavailable — falling back to in-memory SQLite"
+                    );
+                    db = new sqlite3.oo1.DB(":memory:");
+                }
+            } else {
+                db = new sqlite3.oo1.DB(":memory:");
+            }
+
+            postOk(msg.id, { type: "ready" });
+        } catch (err) {
+            postErr(
+                msg.id,
+                `sqlite-wasm init failed: ${err instanceof Error ? err.message : String(err)}`
+            );
+        }
+        return;
+    }
+
+    if (msg.type === "close") {
+        try {
+            if (db !== null) {
+                db.close();
+                db = null;
+            }
+            postOk(msg.id, { type: "closed" });
+        } catch (err) {
+            postErr(
+                msg.id,
+                `close failed: ${err instanceof Error ? err.message : String(err)}`
+            );
+        }
+        return;
+    }
+
+    if (db === null) {
+        postErr(msg.id, "SQLITE.NOT_CONNECTED: database not initialised");
+        return;
+    }
+
+    if (msg.type === "query") {
+        try {
+            const rows = querySql(msg.sql, msg.params ?? []);
+            postOk(msg.id, rows);
+        } catch (err) {
+            postErr(msg.id, err instanceof Error ? err.message : String(err));
+        }
+        return;
+    }
+
+    if (msg.type === "execute") {
+        try {
+            runSql(msg.sql, msg.params ?? []);
+            postOk(msg.id, { rowsAffected: db.changes() });
+        } catch (err) {
+            postErr(msg.id, err instanceof Error ? err.message : String(err));
+        }
+        return;
+    }
+
+    if (
+        msg.type === "begin_tx" ||
+        msg.type === "commit_tx" ||
+        msg.type === "rollback_tx"
+    ) {
+        const sql =
+            msg.type === "begin_tx"
+                ? "BEGIN IMMEDIATE"
+                : msg.type === "commit_tx"
+                  ? "COMMIT"
+                  : "ROLLBACK";
+        try {
+            runSql(sql, []);
+            postOk(msg.id);
+        } catch (err) {
+            postErr(msg.id, err instanceof Error ? err.message : String(err));
+        }
+    }
+};

packages/persistence/database/db-sqlite/src/errors/errors.md

@@ -0,0 +1,93 @@
+# errors
+
+<!-- begin:auto-docs -->
+_(no submodules)_
+<!-- end:auto-docs -->
+## Purpose
+
+Defines the structured error hierarchy for `@suaveplan/db-sqlite`. All runtime failures — connection problems, query errors, migration failures, environment mismatches — are reported as `SqliteError` instances carrying a stable `SQLITE.*` code from the `SQLITE_CODES` registry. This makes error handling programmatic and refactor-safe: callers switch on `err.code` rather than matching message strings.
+
+The companion `mapSqliteCode` helper normalises raw error values thrown by `bun:sqlite` (which surfaces result-code strings like `SQLITE_BUSY` or `SQLITE_CONSTRAINT`) into the same stable code namespace, so adapters never leak driver-specific strings into calling code.
+
+## Features
+
+- `SQLITE_CODES` registry — 10 stable `SQLITE.*` code strings defined via `defineCodes`
+- `SqliteError extends SuaveplanError<SqliteCode>` — carries `code`, `message`, `cause`, and full `SuaveplanError` wire-format serialisation
+- `mapSqliteCode(err)` — maps raw `bun:sqlite` result codes and message substrings to stable `SqliteCode` values; falls back to `SQLITE.QUERY_FAILED`
+- Type alias `SqliteCode` — union of all valid code strings
+
+## Usage: Basic Example
+
+```ts
+import { SqliteError, SQLITE_CODES } from "@suaveplan/db-sqlite/errors/errors";
+
+throw new SqliteError(
+  SQLITE_CODES.NOT_CONNECTED,
+  "Cannot query: adapter is not connected"
+);
+```
+
+## Usage: Advanced Example
+
+```ts
+import { mapSqliteCode, SqliteError, SQLITE_CODES } from "@suaveplan/db-sqlite/errors/errors";
+
+async function safeQuery(db: unknown, sql: string): Promise<unknown[]> {
+  try {
+    // ... execute query
+    return [];
+  } catch (raw) {
+    const code = mapSqliteCode(raw);
+    if (code === SQLITE_CODES.BUSY) {
+      // caller can retry on BUSY
+      throw new SqliteError(code, "Database is busy — retry after a moment", { cause: raw instanceof Error ? raw : undefined });
+    }
+    throw new SqliteError(code, `Query failed: ${raw instanceof Error ? raw.message : String(raw)}`, {
+      cause: raw instanceof Error ? raw : undefined,
+    });
+  }
+}
+```
+
+## API Reference
+
+### `SQLITE_CODES`
+
+Registry object produced by `defineCodes("SQLITE", [...])`. Keys and values:
+
+| Key | Value |
+|-----|-------|
+| `NOT_CONNECTED` | `"SQLITE.NOT_CONNECTED"` |
+| `QUERY_FAILED` | `"SQLITE.QUERY_FAILED"` |
+| `EXECUTE_FAILED` | `"SQLITE.EXECUTE_FAILED"` |
+| `TRANSACTION_FAILED` | `"SQLITE.TRANSACTION_FAILED"` |
+| `MIGRATION_FAILED` | `"SQLITE.MIGRATION_FAILED"` |
+| `ENVIRONMENT_ERROR` | `"SQLITE.ENVIRONMENT_ERROR"` |
+| `BUSY` | `"SQLITE.BUSY"` |
+| `CONSTRAINT` | `"SQLITE.CONSTRAINT"` |
+| `CORRUPT` | `"SQLITE.CORRUPT"` |
+| `DRIVER_INIT_FAILED` | `"SQLITE.DRIVER_INIT_FAILED"` |
+
+### `SqliteError`
+
+```ts
+class SqliteError extends SuaveplanError<SqliteCode> {
+  constructor(code: SqliteCode, message: string, options?: SuaveplanErrorOptions): SqliteError
+}
+```
+
+Inherits `.code`, `.message`, `.cause`, `.name` from `SuaveplanError`. Fully serialisable to the `@suaveplan/error` wire format.
+
+### `mapSqliteCode(err: unknown): SqliteCode`
+
+Maps a raw thrown value from `bun:sqlite` to a stable `SqliteCode`. Checks `err.message` for known result-code strings (`SQLITE_BUSY`, `SQLITE_LOCKED`, `SQLITE_CONSTRAINT`, `SQLITE_CORRUPT`, `SQLITE_NOTADB`). Returns `SQLITE.QUERY_FAILED` as the safe default when no pattern matches.
+
+### `SqliteCode`
+
+Type alias: `(typeof SQLITE_CODES)[keyof typeof SQLITE_CODES]` — the union of all ten code strings.
+
+## Implementation Notes
+
+The `noUselessConstructor` biome rule is suppressed on `SqliteError` because `SuaveplanError` uses a `protected` constructor; the subclass constructor exists solely to expose a `public` entry point — without it TypeScript raises TS2674.
+
+`mapSqliteCode` checks `err instanceof SqliteError` first so re-thrown errors are not re-wrapped. The result-code detection loop converts both the error message and the raw value to upper-case before matching, handling both `"SQLITE_BUSY: database is locked"` messages and bare result-code strings.

packages/persistence/database/db-sqlite/src/errors/errors.test.ts

@@ -0,0 +1,124 @@
+import { SuaveplanError } from "@suaveplan/error";
+import { describe, expect, it } from "@suaveplan/testing/runner";
+import { mapSqliteCode, SQLITE_CODES, SqliteError } from "./errors.js";
+
+describe("SQLITE_CODES", () => {
+    it("has all ten stable codes", { timeout: 5000 }, () => {
+        expect(SQLITE_CODES.NOT_CONNECTED).toBe("SQLITE.NOT_CONNECTED");
+        expect(SQLITE_CODES.QUERY_FAILED).toBe("SQLITE.QUERY_FAILED");
+        expect(SQLITE_CODES.EXECUTE_FAILED).toBe("SQLITE.EXECUTE_FAILED");
+        expect(SQLITE_CODES.TRANSACTION_FAILED).toBe(
+            "SQLITE.TRANSACTION_FAILED"
+        );
+        expect(SQLITE_CODES.MIGRATION_FAILED).toBe("SQLITE.MIGRATION_FAILED");
+        expect(SQLITE_CODES.ENVIRONMENT_ERROR).toBe("SQLITE.ENVIRONMENT_ERROR");
+        expect(SQLITE_CODES.BUSY).toBe("SQLITE.BUSY");
+        expect(SQLITE_CODES.CONSTRAINT).toBe("SQLITE.CONSTRAINT");
+        expect(SQLITE_CODES.CORRUPT).toBe("SQLITE.CORRUPT");
+        expect(SQLITE_CODES.DRIVER_INIT_FAILED).toBe(
+            "SQLITE.DRIVER_INIT_FAILED"
+        );
+    });
+});
+
+describe("SqliteError", () => {
+    it("is instanceof SuaveplanError", { timeout: 5000 }, () => {
+        const err = new SqliteError(SQLITE_CODES.QUERY_FAILED, "query failed");
+        expect(err).toBeInstanceOf(SuaveplanError);
+        expect(err).toBeInstanceOf(SqliteError);
+    });
+
+    it("has correct code", { timeout: 5000 }, () => {
+        const err = new SqliteError(
+            SQLITE_CODES.NOT_CONNECTED,
+            "not connected"
+        );
+        expect(err.code).toBe("SQLITE.NOT_CONNECTED");
+    });
+
+    it("has correct name", { timeout: 5000 }, () => {
+        const err = new SqliteError(SQLITE_CODES.BUSY, "busy");
+        expect(err.name).toBe("SqliteError");
+    });
+
+    it("preserves cause", { timeout: 5000 }, () => {
+        const cause = new Error("original");
+        const err = new SqliteError(SQLITE_CODES.QUERY_FAILED, "wrapped", {
+            cause,
+        });
+        expect(err.cause).toBe(cause);
+    });
+
+    it("message is passed through directly", { timeout: 5000 }, () => {
+        const err = new SqliteError(
+            SQLITE_CODES.TRANSACTION_FAILED,
+            "tx failed"
+        );
+        expect(err.message).toBe("tx failed");
+    });
+});
+
+describe("mapSqliteCode", () => {
+    it("returns code directly when already SqliteError", {
+        timeout: 5000,
+    }, () => {
+        const err = new SqliteError(SQLITE_CODES.BUSY, "busy");
+        expect(mapSqliteCode(err)).toBe("SQLITE.BUSY");
+    });
+
+    it("maps SQLITE_BUSY message to BUSY", { timeout: 5000 }, () => {
+        expect(
+            mapSqliteCode(new Error("SQLITE_BUSY: database is locked"))
+        ).toBe("SQLITE.BUSY");
+    });
+
+    it("maps SQLITE_LOCKED message to BUSY", { timeout: 5000 }, () => {
+        expect(mapSqliteCode(new Error("SQLITE_LOCKED: unable to lock"))).toBe(
+            "SQLITE.BUSY"
+        );
+    });
+
+    it("maps SQLITE_CONSTRAINT message to CONSTRAINT", {
+        timeout: 5000,
+    }, () => {
+        expect(
+            mapSqliteCode(
+                new Error("SQLITE_CONSTRAINT: UNIQUE constraint failed")
+            )
+        ).toBe("SQLITE.CONSTRAINT");
+    });
+
+    it("maps SQLITE_CORRUPT message to CORRUPT", { timeout: 5000 }, () => {
+        expect(
+            mapSqliteCode(
+                new Error("SQLITE_CORRUPT: database disk image is malformed")
+            )
+        ).toBe("SQLITE.CORRUPT");
+    });
+
+    it("maps SQLITE_NOTADB message to CORRUPT", { timeout: 5000 }, () => {
+        expect(
+            mapSqliteCode(new Error("SQLITE_NOTADB: file is not a database"))
+        ).toBe("SQLITE.CORRUPT");
+    });
+
+    it("falls back to QUERY_FAILED for unknown Error", {
+        timeout: 5000,
+    }, () => {
+        expect(mapSqliteCode(new Error("some random error"))).toBe(
+            "SQLITE.QUERY_FAILED"
+        );
+    });
+
+    it("handles non-Error thrown values", { timeout: 5000 }, () => {
+        expect(mapSqliteCode("SQLITE_BUSY: locked")).toBe("SQLITE.BUSY");
+    });
+
+    it("falls back to QUERY_FAILED for unknown non-Error", {
+        timeout: 5000,
+    }, () => {
+        expect(mapSqliteCode("something unexpected")).toBe(
+            "SQLITE.QUERY_FAILED"
+        );
+    });
+});

packages/persistence/database/db-sqlite/src/errors/errors.ts

@@ -0,0 +1,54 @@
+import {
+    defineCodes,
+    SuaveplanError,
+    type SuaveplanErrorOptions,
+} from "@suaveplan/error";
+
+export const SQLITE_CODES = defineCodes("SQLITE", [
+    "NOT_CONNECTED",
+    "QUERY_FAILED",
+    "EXECUTE_FAILED",
+    "TRANSACTION_FAILED",
+    "MIGRATION_FAILED",
+    "ENVIRONMENT_ERROR",
+    "BUSY",
+    "CONSTRAINT",
+    "CORRUPT",
+    "DRIVER_INIT_FAILED",
+] as const);
+
+export type SqliteCode = (typeof SQLITE_CODES)[keyof typeof SQLITE_CODES];
+
+export class SqliteError extends SuaveplanError<SqliteCode> {
+    // biome-ignore lint/complexity/noUselessConstructor: SuaveplanError constructor is protected; exposes public entry point
+    public constructor(
+        code: SqliteCode,
+        message: string,
+        options?: SuaveplanErrorOptions
+    ) {
+        super(code, message, options);
+    }
+}
+
+const RESULT_CODE_MAP: Record<string, SqliteCode> = {
+    SQLITE_BUSY: SQLITE_CODES.BUSY,
+    SQLITE_LOCKED: SQLITE_CODES.BUSY,
+    SQLITE_CONSTRAINT: SQLITE_CODES.CONSTRAINT,
+    SQLITE_CORRUPT: SQLITE_CODES.CORRUPT,
+    SQLITE_NOTADB: SQLITE_CODES.CORRUPT,
+};
+
+export function mapSqliteCode(err: unknown): SqliteCode {
+    if (err instanceof SqliteError) return err.code;
+
+    const msg =
+        err instanceof Error
+            ? err.message.toUpperCase()
+            : String(err).toUpperCase();
+
+    for (const [pattern, code] of Object.entries(RESULT_CODE_MAP)) {
+        if (msg.includes(pattern)) return code;
+    }
+
+    return SQLITE_CODES.QUERY_FAILED;
+}

packages/persistence/database/db-sqlite/src/errors/errors.types.ts

@@ -0,0 +1 @@
+export type { SqliteCode } from "./errors.js";

packages/persistence/database/db-sqlite/src/errors/index.ts

@@ -0,0 +1,6 @@
+export type { SqliteCode } from "./errors.js";
+export {
+    mapSqliteCode,
+    SQLITE_CODES,
+    SqliteError,
+} from "./errors.js";

packages/persistence/database/db-sqlite/src/index.ts

@@ -0,0 +1,16 @@
+// errors + schemas
+
+// adapter
+export * from "./adapter/index.js";
+// cache
+export * from "./cache/index.js";
+// connection helpers
+export * from "./connection/index.js";
+// drivers
+export * from "./drivers/index.js";
+export * from "./errors/index.js";
+// migration runner
+export * from "./migration/index.js";
+// otel utilities
+export * from "./otel/index.js";
+export * from "./schemas/index.js";

packages/persistence/database/db-sqlite/src/migration/index.ts

@@ -0,0 +1 @@
+export { MigrationRunner } from "./migration.js";

packages/persistence/database/db-sqlite/src/migration/migration.md

@@ -0,0 +1,84 @@
+# migration
+
+<!-- begin:auto-docs -->
+_(no submodules)_
+<!-- end:auto-docs -->
+## Purpose
+
+`MigrationRunner` applies forward-only SQL migration files to a SQLite database. It maintains a ledger table (`__sqlite_migrations` by default) that records which migration files have been applied, making runs idempotent — re-running the same set of migration files produces the same database state regardless of how many times it is called.
+
+Each migration is executed inside a `BEGIN IMMEDIATE` transaction. A failure mid-migration triggers an automatic `ROLLBACK`, ensuring the database is never left in a partially-applied state. A `dryRun()` mode reads and validates files but makes no database changes, letting callers preview what would be applied.
+
+## Features
+
+- Forward-only, filename-ordered migration application (`.sql` files sorted lexicographically)
+- Idempotent: skips already-applied migrations via ledger table lookup
+- Transactional: each migration runs in `BEGIN IMMEDIATE` / `COMMIT` / `ROLLBACK`
+- Dry-run mode: previews pending migrations without modifying the database
+- Injectable `Clock` for deterministic `applied_at` timestamps in tests
+- Configurable `migrationsFolder`, `migrationsTable`, and `dryRun` via `MigrationRunnerOptionsSchema`
+- Throws `SqliteError(SQLITE.MIGRATION_FAILED)` with original cause on any failure
+
+## Usage: Basic Example
+
+```ts
+import { createBunDriver } from "@suaveplan/db-sqlite/drivers/bun-driver";
+import { MigrationRunner } from "@suaveplan/db-sqlite/migration/migration";
+
+const { sqlite, close } = await createBunDriver({ filename: "app.db" });
+try {
+  const runner = new MigrationRunner(sqlite, { migrationsFolder: "./db/migrations" });
+  const result = await runner.run();
+  console.log(`Applied ${result.applied} migration(s):`, result.migrations);
+} finally {
+  await close();
+}
+```
+
+## Usage: Advanced Example
+
+```ts
+import { MigrationRunner } from "@suaveplan/db-sqlite/migration/migration";
+
+// Dry-run to preview without applying
+const runner = new MigrationRunner(sqlite, {
+  migrationsFolder: "./db/migrations",
+  migrationsTable: "custom_ledger",
+});
+
+const preview = await runner.dryRun();
+console.log("Would apply:", preview.migrations);
+
+if (preview.applied > 0) {
+  const result = await runner.run();
+  console.log("Applied:", result.migrations);
+}
+```
+
+## API Reference
+
+### `new MigrationRunner(sqlite, options?, clock?)`
+
+Constructs a `MigrationRunner`. Validates `options` via `MigrationRunnerOptionsSchema`.
+
+| Parameter | Type | Description |
+|-----------|------|-------------|
+| `sqlite` | `bun:sqlite Database` | Database instance to migrate |
+| `options` | `Partial<MigrationRunnerOptions>` | Folder, table, dry-run settings |
+| `clock` | `Clock` | Injectable clock for `applied_at` (default: `Date.now`) |
+
+### `run(options?: Partial<MigrationRunnerOptions>): Promise<MigrationResult>`
+
+Reads `.sql` files from `migrationsFolder`, skips already-applied entries, applies each in order, records to ledger. Returns `{ applied: number, migrations: string[] }`.
+
+### `dryRun(options?: Partial<MigrationRunnerOptions>): Promise<MigrationResult>`
+
+Same as `run()` but makes no database changes. Useful for change-preview UIs and CI checks.
+
+## Implementation Notes
+
+Migrations are sorted lexicographically by filename. Conventional naming (`001_init.sql`, `002_add_users.sql`) produces chronological order. Non-`.sql` files in the folder are silently ignored.
+
+The `#isMigrationApplied` check uses a raw SQL query rather than a prepared statement to avoid circular dependency with `PreparedStatementCache` — the migration runner runs before the adapter is fully connected and the cache is available.
+
+The `applied_at` column stores a Unix millisecond timestamp as `INTEGER` rather than ISO 8601 text. This keeps sorting and comparison simple and avoids timezone ambiguity. Consumers that need a `Date` object divide by 1000 or use `new Date(applied_at)`.

packages/persistence/database/db-sqlite/src/migration/migration.property.test.ts

@@ -0,0 +1,99 @@
+import { mkdir, rm, writeFile } from "node:fs/promises";
+import { tmpdir } from "node:os";
+import { join } from "node:path";
+import { describe, expect, it } from "@suaveplan/testing/runner";
+import fc from "fast-check";
+import { MigrationRunner } from "./migration.js";
+
+async function makeDb(): Promise<{
+    sqlite: import("bun:sqlite").Database;
+    close: () => void;
+}> {
+    const { Database } = await import("bun:sqlite");
+    const sqlite = new Database(":memory:");
+    return { sqlite, close: () => sqlite.close() };
+}
+
+describe("MigrationRunner property-based", () => {
+    it("ledger entries are monotonically sorted by filename after any run", {
+        timeout: 30000,
+    }, async () => {
+        await fc.assert(
+            fc.asyncProperty(
+                fc.array(fc.stringMatching(/^[0-9]{3}_[a-z]{3}$/), {
+                    minLength: 1,
+                    maxLength: 6,
+                    noNullPrototypes: true,
+                }),
+                async (baseNames) => {
+                    const unique = [...new Set(baseNames)].sort();
+                    const { sqlite, close } = await makeDb();
+                    const folder = join(
+                        tmpdir(),
+                        `migration-prop-${Date.now()}-${Math.random().toString(36).slice(2)}`
+                    );
+                    await mkdir(folder, { recursive: true });
+
+                    for (const name of unique) {
+                        const safe = name.replace(/[^a-z0-9_]/gi, "_");
+                        await writeFile(
+                            join(folder, `${safe}.sql`),
+                            `CREATE TABLE IF NOT EXISTS t_${safe} (id INTEGER PRIMARY KEY)`
+                        );
+                    }
+
+                    try {
+                        const runner = new MigrationRunner(sqlite, {
+                            migrationsFolder: folder,
+                        });
+                        const result = await runner.run();
+                        expect(result.migrations).toEqual(
+                            [...result.migrations].sort()
+                        );
+                    } finally {
+                        close();
+                        await rm(folder, { recursive: true, force: true });
+                    }
+                }
+            ),
+            { numRuns: 10 }
+        );
+    });
+
+    it("re-running is idempotent: applied count equals 0 on second run", {
+        timeout: 30000,
+    }, async () => {
+        await fc.assert(
+            fc.asyncProperty(fc.integer({ min: 1, max: 4 }), async (n) => {
+                const { sqlite, close } = await makeDb();
+                const folder = join(
+                    tmpdir(),
+                    `migration-idem-${Date.now()}-${Math.random().toString(36).slice(2)}`
+                );
+                await mkdir(folder, { recursive: true });
+
+                for (let i = 0; i < n; i++) {
+                    await writeFile(
+                        join(folder, `${String(i).padStart(3, "0")}_step.sql`),
+                        `CREATE TABLE IF NOT EXISTS step_${i} (id INTEGER PRIMARY KEY)`
+                    );
+                }
+
+                try {
+                    const runner = new MigrationRunner(sqlite, {
+                        migrationsFolder: folder,
+                    });
+                    const first = await runner.run();
+                    const second = await runner.run();
+                    expect(first.applied).toBe(n);
+                    expect(second.applied).toBe(0);
+                    expect(second.migrations).toEqual([]);
+                } finally {
+                    close();
+                    await rm(folder, { recursive: true, force: true });
+                }
+            }),
+            { numRuns: 10 }
+        );
+    });
+});

packages/persistence/database/db-sqlite/src/migration/migration.test.ts

@@ -0,0 +1,252 @@
+import { mkdir, rm, writeFile } from "node:fs/promises";
+import { tmpdir } from "node:os";
+import { join } from "node:path";
+import { describe, expect, it } from "@suaveplan/testing/runner";
+import { SqliteError } from "../errors/index.js";
+import { MigrationRunner } from "./migration.js";
+
+// Minimal in-memory sqlite shim using real bun:sqlite
+async function makeDb(): Promise<{
+    sqlite: import("bun:sqlite").Database;
+    close: () => void;
+}> {
+    const { Database } = await import("bun:sqlite");
+    const sqlite = new Database(":memory:");
+    return { sqlite, close: () => sqlite.close() };
+}
+
+async function makeMigrationDir(
+    files: Record<string, string>
+): Promise<{ folder: string; cleanup: () => Promise<void> }> {
+    const folder = join(tmpdir(), `migration-test-${Date.now()}`);
+    await mkdir(folder, { recursive: true });
+    for (const [name, sql] of Object.entries(files)) {
+        await writeFile(join(folder, name), sql, "utf8");
+    }
+    return {
+        folder,
+        cleanup: () => rm(folder, { recursive: true, force: true }),
+    };
+}
+
+describe("MigrationRunner", () => {
+    it("applies pending migrations and returns result", {
+        timeout: 30000,
+    }, async () => {
+        const { sqlite, close } = await makeDb();
+        const { folder, cleanup } = await makeMigrationDir({
+            "001_init.sql":
+                "CREATE TABLE users (id INTEGER PRIMARY KEY, name TEXT)",
+        });
+        try {
+            const runner = new MigrationRunner(sqlite, {
+                migrationsFolder: folder,
+            });
+            const result = await runner.run();
+            expect(result.applied).toBe(1);
+            expect(result.migrations).toEqual(["001_init.sql"]);
+        } finally {
+            await cleanup();
+            close();
+        }
+    });
+
+    it("is idempotent — second run applies nothing", {
+        timeout: 30000,
+    }, async () => {
+        const { sqlite, close } = await makeDb();
+        const { folder, cleanup } = await makeMigrationDir({
+            "001_init.sql":
+                "CREATE TABLE users (id INTEGER PRIMARY KEY, name TEXT)",
+        });
+        try {
+            const runner = new MigrationRunner(sqlite, {
+                migrationsFolder: folder,
+            });
+            await runner.run();
+            const second = await runner.run();
+            expect(second.applied).toBe(0);
+            expect(second.migrations).toEqual([]);
+        } finally {
+            await cleanup();
+            close();
+        }
+    });
+
+    it("applies migrations in sorted filename order", {
+        timeout: 30000,
+    }, async () => {
+        const { sqlite, close } = await makeDb();
+        const { folder, cleanup } = await makeMigrationDir({
+            "002_add_col.sql": "ALTER TABLE t ADD COLUMN val TEXT",
+            "001_create.sql": "CREATE TABLE t (id INTEGER PRIMARY KEY)",
+        });
+        try {
+            const runner = new MigrationRunner(sqlite, {
+                migrationsFolder: folder,
+            });
+            const result = await runner.run();
+            expect(result.migrations).toEqual([
+                "001_create.sql",
+                "002_add_col.sql",
+            ]);
+        } finally {
+            await cleanup();
+            close();
+        }
+    });
+
+    it("dry-run does not modify the database", {
+        timeout: 30000,
+    }, async () => {
+        const { sqlite, close } = await makeDb();
+        const { folder, cleanup } = await makeMigrationDir({
+            "001_init.sql": "CREATE TABLE dry_test (id INTEGER PRIMARY KEY)",
+        });
+        try {
+            const runner = new MigrationRunner(sqlite, {
+                migrationsFolder: folder,
+            });
+            const result = await runner.dryRun();
+            expect(result.applied).toBe(1);
+            // Table should NOT exist — dry run made no changes
+            expect(() =>
+                sqlite.query("SELECT 1 FROM dry_test").get()
+            ).toThrow();
+        } finally {
+            await cleanup();
+            close();
+        }
+    });
+
+    it("throws MIGRATION_FAILED when folder is missing", {
+        timeout: 30000,
+    }, async () => {
+        const { sqlite, close } = await makeDb();
+        try {
+            const runner = new MigrationRunner(sqlite, {
+                migrationsFolder: "/nonexistent/path/migrations",
+            });
+            await expect(runner.run()).rejects.toBeInstanceOf(SqliteError);
+            await expect(runner.run()).rejects.toMatchObject({
+                code: "SQLITE.MIGRATION_FAILED",
+            });
+        } finally {
+            close();
+        }
+    });
+
+    it("throws MIGRATION_FAILED when SQL is invalid", {
+        timeout: 30000,
+    }, async () => {
+        const { sqlite, close } = await makeDb();
+        const { folder, cleanup } = await makeMigrationDir({
+            "001_bad.sql": "THIS IS NOT VALID SQL !!@#$",
+        });
+        try {
+            const runner = new MigrationRunner(sqlite, {
+                migrationsFolder: folder,
+            });
+            await expect(runner.run()).rejects.toBeInstanceOf(SqliteError);
+            await expect(runner.run()).rejects.toMatchObject({
+                code: "SQLITE.MIGRATION_FAILED",
+            });
+        } finally {
+            await cleanup();
+            close();
+        }
+    });
+
+    it("uses injectable clock for applied_at timestamps", {
+        timeout: 30000,
+    }, async () => {
+        const { sqlite, close } = await makeDb();
+        const { folder, cleanup } = await makeMigrationDir({
+            "001_init.sql": "CREATE TABLE ts_test (id INTEGER PRIMARY KEY)",
+        });
+        const fixedNow = 1_000_000_000;
+        const clock = () => fixedNow;
+        try {
+            const runner = new MigrationRunner(
+                sqlite,
+                { migrationsFolder: folder },
+                clock
+            );
+            await runner.run();
+            const row = sqlite
+                .query(
+                    "SELECT applied_at FROM __sqlite_migrations WHERE id = ?"
+                )
+                .get(["001_init.sql"]) as { applied_at: number } | null;
+            expect(row?.applied_at).toBe(fixedNow);
+        } finally {
+            await cleanup();
+            close();
+        }
+    });
+
+    it("skips non-sql files in migrations folder", {
+        timeout: 30000,
+    }, async () => {
+        const { sqlite, close } = await makeDb();
+        const { folder, cleanup } = await makeMigrationDir({
+            "001_init.sql": "CREATE TABLE skip_test (id INTEGER PRIMARY KEY)",
+            "README.md": "# migrations",
+            ".gitkeep": "",
+        });
+        try {
+            const runner = new MigrationRunner(sqlite, {
+                migrationsFolder: folder,
+            });
+            const result = await runner.run();
+            expect(result.applied).toBe(1);
+            expect(result.migrations).toEqual(["001_init.sql"]);
+        } finally {
+            await cleanup();
+            close();
+        }
+    });
+
+    it("supports custom migrationsTable name", {
+        timeout: 30000,
+    }, async () => {
+        const { sqlite, close } = await makeDb();
+        const { folder, cleanup } = await makeMigrationDir({
+            "001_init.sql":
+                "CREATE TABLE custom_table_test (id INTEGER PRIMARY KEY)",
+        });
+        try {
+            const runner = new MigrationRunner(sqlite, {
+                migrationsFolder: folder,
+                migrationsTable: "custom_ledger",
+            });
+            await runner.run();
+            const row = sqlite.query("SELECT 1 FROM custom_ledger").get();
+            expect(row).not.toBeNull();
+        } finally {
+            await cleanup();
+            close();
+        }
+    });
+
+    it("run() accepts per-call option overrides", {
+        timeout: 30000,
+    }, async () => {
+        const { sqlite, close } = await makeDb();
+        const { folder, cleanup } = await makeMigrationDir({
+            "001_init.sql":
+                "CREATE TABLE override_test (id INTEGER PRIMARY KEY)",
+        });
+        try {
+            const runner = new MigrationRunner(sqlite, {
+                migrationsFolder: "/nonexistent",
+            });
+            // Override with valid folder at call site
+            const result = await runner.run({ migrationsFolder: folder });
+            expect(result.applied).toBe(1);
+        } finally {
+            await cleanup();
+            close();
+        }
+    });
+});

packages/persistence/database/db-sqlite/src/migration/migration.ts

@@ -0,0 +1,145 @@
+import { readdir, readFile } from "node:fs/promises";
+import { join } from "node:path";
+import type { MigrationResult } from "@suaveplan/db";
+import type { Clock } from "@suaveplan/types";
+import { SQLITE_CODES, SqliteError } from "../errors/index.js";
+import type { MigrationRunnerOptions } from "../schemas/index.js";
+import { MigrationRunnerOptionsSchema } from "../schemas/index.js";
+
+const DEFAULT_CLOCK: Clock = () => Date.now();
+
+export class MigrationRunner {
+    readonly #options: Required<MigrationRunnerOptions>;
+    // biome-ignore lint/suspicious/noExplicitAny: bun:sqlite Database type varies by environment
+    readonly #sqlite: any;
+    readonly #clock: Clock;
+
+    constructor(
+        // biome-ignore lint/suspicious/noExplicitAny: bun:sqlite Database type varies by environment
+        sqlite: any,
+        options?: Partial<MigrationRunnerOptions>,
+        clock: Clock = DEFAULT_CLOCK
+    ) {
+        const parsed = MigrationRunnerOptionsSchema.parse(options ?? {});
+        this.#options = parsed as Required<MigrationRunnerOptions>;
+        this.#sqlite = sqlite;
+        this.#clock = clock;
+    }
+
+    async run(
+        options?: Partial<MigrationRunnerOptions>
+    ): Promise<MigrationResult> {
+        const opts =
+            options !== undefined
+                ? (MigrationRunnerOptionsSchema.parse({
+                      ...this.#options,
+                      ...options,
+                  }) as Required<MigrationRunnerOptions>)
+                : this.#options;
+        return this.#runWithOptions(opts);
+    }
+
+    async dryRun(
+        options?: Partial<MigrationRunnerOptions>
+    ): Promise<MigrationResult> {
+        const base =
+            options !== undefined
+                ? (MigrationRunnerOptionsSchema.parse({
+                      ...this.#options,
+                      ...options,
+                  }) as Required<MigrationRunnerOptions>)
+                : this.#options;
+        return this.#runWithOptions({ ...base, dryRun: true });
+    }
+
+    async #runWithOptions(
+        opts: Required<MigrationRunnerOptions>
+    ): Promise<MigrationResult> {
+        this.#ensureLedgerTable(opts.migrationsTable);
+
+        let files: string[];
+        try {
+            const entries = await readdir(opts.migrationsFolder);
+            files = entries.filter((f) => f.endsWith(".sql")).sort();
+        } catch (err) {
+            throw new SqliteError(
+                SQLITE_CODES.MIGRATION_FAILED,
+                `Cannot read migrations folder '${opts.migrationsFolder}': ${err instanceof Error ? err.message : String(err)}`,
+                { cause: err instanceof Error ? err : undefined }
+            );
+        }
+
+        const applied: string[] = [];
+
+        for (const file of files) {
+            const isApplied = this.#isMigrationApplied(
+                opts.migrationsTable,
+                file
+            );
+            if (isApplied) continue;
+
+            const filePath = join(opts.migrationsFolder, file);
+            let sql: string;
+            try {
+                sql = await readFile(filePath, "utf8");
+            } catch (err) {
+                throw new SqliteError(
+                    SQLITE_CODES.MIGRATION_FAILED,
+                    `Cannot read migration file '${file}': ${err instanceof Error ? err.message : String(err)}`,
+                    { cause: err instanceof Error ? err : undefined }
+                );
+            }
+
+            if (!opts.dryRun) {
+                try {
+                    this.#sqlite.run("BEGIN IMMEDIATE");
+                    this.#sqlite.run(sql);
+                    this.#sqlite.run(
+                        `INSERT INTO ${opts.migrationsTable} (id, applied_at) VALUES (?, ?)`,
+                        [file, this.#clock()]
+                    );
+                    this.#sqlite.run("COMMIT");
+                } catch (err) {
+                    try {
+                        this.#sqlite.run("ROLLBACK");
+                    } catch {
+                        // ignore rollback errors
+                    }
+                    throw new SqliteError(
+                        SQLITE_CODES.MIGRATION_FAILED,
+                        `Migration '${file}' failed: ${err instanceof Error ? err.message : String(err)}`,
+                        { cause: err instanceof Error ? err : undefined }
+                    );
+                }
+            }
+
+            applied.push(file);
+        }
+
+        return { applied: applied.length, migrations: applied };
+    }
+
+    #ensureLedgerTable(table: string): void {
+        try {
+            this.#sqlite.run(`
+                CREATE TABLE IF NOT EXISTS ${table} (
+                    id TEXT PRIMARY KEY,
+                    applied_at INTEGER NOT NULL
+                )
+            `);
+        } catch (err) {
+            throw new SqliteError(
+                SQLITE_CODES.MIGRATION_FAILED,
+                `Failed to create migrations ledger table: ${err instanceof Error ? err.message : String(err)}`,
+                { cause: err instanceof Error ? err : undefined }
+            );
+        }
+    }
+
+    #isMigrationApplied(table: string, id: string): boolean {
+        const row = this.#sqlite
+            .query(`SELECT 1 FROM ${table} WHERE id = ?`)
+            .get([id]);
+        return row !== null && row !== undefined;
+    }
+}

packages/persistence/database/db-sqlite/src/otel/index.ts

@@ -0,0 +1,5 @@
+export {
+    resetOtelInstruments,
+    sanitizeSql,
+    withQuerySpan,
+} from "./otel.js";

packages/persistence/database/db-sqlite/src/otel/otel.md

@@ -0,0 +1,65 @@
+# otel
+
+<!-- begin:auto-docs -->
+_(no submodules)_
+<!-- end:auto-docs -->
+## Purpose
+
+OpenTelemetry instrumentation for `@suaveplan/db-sqlite`. The `withQuerySpan` function wraps any async database operation in a named OTel span, setting `db.system=sqlite` and `db.statement` (sanitised) as span attributes, recording exceptions on failure, and emitting latency and count metrics. It is a no-op when no OTel SDK is registered — the `@opentelemetry/api` no-op provider handles all calls silently.
+
+`sanitizeSql` strips string literals and numeric values from SQL strings before attaching them to span attributes, preventing PII leakage into telemetry backends. Parameterised queries still record their structure (`SELECT * FROM users WHERE id = ?`) without revealing actual parameter values.
+
+## Features
+
+- `withQuerySpan(operationName, rawSql, fn)` — wraps fn in a named span with `db.system=sqlite` and sanitised `db.statement`
+- `sanitizeSql(sql)` — replaces string literals, quoted identifiers, and bare numbers with `?` placeholders
+- Histograms: `sqlite.query.duration_ms` (labels: `operation`)
+- Counters: `sqlite.query.count`, `sqlite.error.count` (labels: `operation`)
+- `resetOtelInstruments()` — clears the lazy instruments singleton for test isolation
+
+## Usage: Basic Example
+
+```ts
+import { withQuerySpan } from "@suaveplan/db-sqlite/otel";
+
+const rows = await withQuerySpan(
+  "db.query",
+  "SELECT * FROM users WHERE id = 42",
+  async () => sqlite.query("SELECT * FROM users WHERE id = ?").all([42])
+);
+```
+
+## Usage: Advanced Example
+
+```ts
+import { sanitizeSql, withQuerySpan } from "@suaveplan/db-sqlite/otel";
+
+// Preview sanitisation before instrumentation
+const safe = sanitizeSql("SELECT * FROM t WHERE name = 'Alice' AND age = 30");
+// => "SELECT * FROM t WHERE name = ? AND age = ?"
+
+const result = await withQuerySpan("db.execute", safe, async () => {
+  sqlite.run("INSERT INTO events VALUES (?, ?)", ["login", 1234567890]);
+  return { rowsAffected: 1 };
+});
+```
+
+## API Reference
+
+### `withQuerySpan<T>(operationName, rawSql, fn): Promise<T>`
+
+Starts a span named `operationName`, sets `db.system=sqlite` and `db.statement=sanitizeSql(rawSql)`, then calls `fn()`. On success records latency and increments `sqlite.query.count`. On failure records exception, sets `ERROR` status, and increments `sqlite.error.count`. Always ends the span.
+
+### `sanitizeSql(sql: string): string`
+
+Replaces single-quoted strings, double-quoted strings, and numeric literals (integer and decimal) with `?`. Safe to call on arbitrary SQL strings — does not parse SQL, only applies a regex substitution.
+
+### `resetOtelInstruments(): void`
+
+Clears the lazy OTel instruments singleton. Use in tests so each suite starts with fresh counter baselines. Also called internally by `SqliteAdapter.disconnect()`.
+
+## Implementation Notes
+
+The instruments lazy singleton is initialised on the first `withQuerySpan` call rather than at module load to ensure the OTel provider is registered before the meter is obtained. Tests that call `resetOtelInstruments()` between suites prevent counter state from leaking across test files.
+
+`sanitizeSql` uses a single-pass regex and is intentionally simple — it does not understand SQL syntax, so complex nested strings or edge-case identifiers may not be fully sanitised. This is acceptable for telemetry purposes where approximate sanitisation is sufficient.

packages/persistence/database/db-sqlite/src/otel/otel.test.ts

@@ -0,0 +1,102 @@
+import { afterEach, describe, expect, it } from "@suaveplan/testing/runner";
+import { resetOtelInstruments, sanitizeSql, withQuerySpan } from "./otel.js";
+
+afterEach(() => {
+    resetOtelInstruments();
+});
+
+describe("sanitizeSql", () => {
+    it("strips single-quoted string literals", { timeout: 5000 }, () => {
+        expect(sanitizeSql("SELECT * FROM t WHERE name = 'Alice'")).toBe(
+            "SELECT * FROM t WHERE name = ?"
+        );
+    });
+
+    it("strips double-quoted identifiers/strings", { timeout: 5000 }, () => {
+        expect(sanitizeSql('SELECT "col" FROM t WHERE id = "val"')).toBe(
+            "SELECT ? FROM t WHERE id = ?"
+        );
+    });
+
+    it("strips integer literals", { timeout: 5000 }, () => {
+        expect(sanitizeSql("SELECT * FROM t WHERE id = 42")).toBe(
+            "SELECT * FROM t WHERE id = ?"
+        );
+    });
+
+    it("strips decimal literals", { timeout: 5000 }, () => {
+        expect(sanitizeSql("SELECT * FROM t WHERE score > 3.14")).toBe(
+            "SELECT * FROM t WHERE score > ?"
+        );
+    });
+
+    it("strips multiple literals in one query", { timeout: 5000 }, () => {
+        expect(
+            sanitizeSql("SELECT * FROM t WHERE name = 'Bob' AND age = 30")
+        ).toBe("SELECT * FROM t WHERE name = ? AND age = ?");
+    });
+
+    it("leaves plain SQL keywords untouched", { timeout: 5000 }, () => {
+        expect(sanitizeSql("SELECT id FROM users")).toBe(
+            "SELECT id FROM users"
+        );
+    });
+
+    it("handles empty string", { timeout: 5000 }, () => {
+        expect(sanitizeSql("")).toBe("");
+    });
+});
+
+describe("withQuerySpan", () => {
+    it("returns resolved value on success", { timeout: 5000 }, async () => {
+        const result = await withQuerySpan(
+            "test.query",
+            "SELECT 1",
+            async () => 42
+        );
+        expect(result).toBe(42);
+    });
+
+    it("re-throws errors from fn", { timeout: 5000 }, async () => {
+        await expect(
+            withQuerySpan("test.query", "SELECT 1", async () => {
+                throw new Error("query error");
+            })
+        ).rejects.toThrow("query error");
+    });
+
+    it("re-throws non-Error thrown values", { timeout: 5000 }, async () => {
+        await expect(
+            withQuerySpan("test.query", "SELECT 1", async () => {
+                throw "string error";
+            })
+        ).rejects.toBe("string error");
+    });
+
+    it("works with no-op OTel provider (no SDK registered)", {
+        timeout: 5000,
+    }, async () => {
+        await expect(
+            withQuerySpan("test.query", "SELECT 1", async () => [])
+        ).resolves.toEqual([]);
+    });
+
+    it("sanitises SQL for span attributes", { timeout: 5000 }, async () => {
+        // Verify it doesn't throw when SQL contains literals
+        const result = await withQuerySpan(
+            "test.query",
+            "SELECT * FROM t WHERE name = 'sensitive'",
+            async () => "ok"
+        );
+        expect(result).toBe("ok");
+    });
+
+    it("works after resetOtelInstruments()", { timeout: 5000 }, async () => {
+        await withQuerySpan("test.query", "SELECT 1", async () => 1);
+        resetOtelInstruments();
+        // Should reinitialise instruments without throwing
+        await expect(
+            withQuerySpan("test.query", "SELECT 1", async () => 2)
+        ).resolves.toBe(2);
+    });
+});

packages/persistence/database/db-sqlite/src/otel/otel.ts

@@ -0,0 +1,89 @@
+import {
+    type Attributes,
+    metrics,
+    SpanStatusCode,
+    trace,
+} from "@opentelemetry/api";
+
+const TRACER_NAME = "@suaveplan/db-sqlite";
+
+let otelInstruments:
+    | {
+          queryDuration: ReturnType<
+              ReturnType<typeof metrics.getMeter>["createHistogram"]
+          >;
+          queryCount: ReturnType<
+              ReturnType<typeof metrics.getMeter>["createCounter"]
+          >;
+          errorCount: ReturnType<
+              ReturnType<typeof metrics.getMeter>["createCounter"]
+          >;
+      }
+    | undefined;
+
+function getInstruments(): typeof otelInstruments & object {
+    if (otelInstruments !== undefined) return otelInstruments;
+    const meter = metrics.getMeter(TRACER_NAME);
+    otelInstruments = {
+        queryDuration: meter.createHistogram("sqlite.query.duration_ms", {
+            description: "Duration of SQLite query execution in milliseconds",
+            unit: "ms",
+        }),
+        queryCount: meter.createCounter("sqlite.query.count", {
+            description: "Number of SQLite queries executed",
+        }),
+        errorCount: meter.createCounter("sqlite.error.count", {
+            description: "Number of SQLite query errors",
+        }),
+    };
+    return otelInstruments;
+}
+
+export function resetOtelInstruments(): void {
+    otelInstruments = undefined;
+}
+
+const LITERAL_PATTERN = /'[^']*'|"[^"]*"|\b\d+\.?\d*\b/g;
+
+export function sanitizeSql(sql: string): string {
+    return sql.replace(LITERAL_PATTERN, "?");
+}
+
+export async function withQuerySpan<T>(
+    operationName: string,
+    rawSql: string,
+    fn: () => Promise<T>
+): Promise<T> {
+    const tracer = trace.getTracer(TRACER_NAME);
+    const sanitised = sanitizeSql(rawSql);
+    const attrs: Attributes = {
+        "db.system": "sqlite",
+        "db.statement": sanitised,
+    };
+    const span = tracer.startSpan(operationName, { attributes: attrs });
+    const instruments = getInstruments();
+    const start = Date.now();
+
+    try {
+        const result = await fn();
+        const elapsed = Date.now() - start;
+        instruments.queryDuration.record(elapsed, { operation: operationName });
+        instruments.queryCount.add(1, { operation: operationName });
+        span.setStatus({ code: SpanStatusCode.OK });
+        return result;
+    } catch (err) {
+        const elapsed = Date.now() - start;
+        instruments.queryDuration.record(elapsed, { operation: operationName });
+        instruments.errorCount.add(1, { operation: operationName });
+        span.setStatus({
+            code: SpanStatusCode.ERROR,
+            message: err instanceof Error ? err.message : String(err),
+        });
+        span.recordException(
+            err instanceof Error ? err : new Error(String(err))
+        );
+        throw err;
+    } finally {
+        span.end();
+    }
+}

packages/persistence/database/db-sqlite/src/schemas/index.ts

@@ -0,0 +1,12 @@
+export type {
+    BunDriverOptions,
+    MigrationRunnerOptions,
+    SqliteAdapterOptions,
+    WasmDriverOptions,
+} from "./schemas.js";
+export {
+    BunDriverOptionsSchema,
+    MigrationRunnerOptionsSchema,
+    SqliteAdapterOptionsSchema,
+    WasmDriverOptionsSchema,
+} from "./schemas.js";

packages/persistence/database/db-sqlite/src/schemas/schemas.md

@@ -0,0 +1,71 @@
+# schemas
+
+<!-- begin:auto-docs -->
+_(no submodules)_
+<!-- end:auto-docs -->
+## Purpose
+
+Zod schemas and inferred TypeScript types for all `@suaveplan/db-sqlite` configuration objects. Centralising validation in one module ensures that every entry point — `createBunDriver`, `createWasmDriver`, `SqliteAdapter`, `MigrationRunner` — applies the same rules with the same error messages, rather than duplicating ad-hoc checks across modules.
+
+All schemas use `.strict()` where applicable so extra unknown properties are rejected at runtime, preventing silent misconfiguration from typos in option objects.
+
+## Features
+
+- `BunDriverOptionsSchema` — validates `filename` (optional string) and `readonly` (optional boolean, default `false`)
+- `WasmDriverOptionsSchema` — validates `filename` (optional string) for OPFS persistence
+- `SqliteAdapterOptionsSchema` — alias for `BunDriverOptionsSchema`; adapter and driver share the same shape
+- `MigrationRunnerOptionsSchema` — validates `migrationsFolder` (default `"./migrations"`), `migrationsTable` (default `"__sqlite_migrations"`), `dryRun` (default `false`)
+- Inferred TypeScript types exported for all four schemas
+
+## Usage: Basic Example
+
+```ts
+import { BunDriverOptionsSchema } from "@suaveplan/db-sqlite/schemas";
+
+const opts = BunDriverOptionsSchema.parse({ filename: ":memory:" });
+// opts.readonly === false  (default applied)
+```
+
+## Usage: Advanced Example
+
+```ts
+import { MigrationRunnerOptionsSchema } from "@suaveplan/db-sqlite/schemas";
+
+const opts = MigrationRunnerOptionsSchema.parse({
+  migrationsFolder: "./db/migrations",
+  dryRun: true,
+});
+// opts.migrationsTable === "__sqlite_migrations"  (default applied)
+// opts.dryRun === true
+```
+
+## API Reference
+
+### `BunDriverOptionsSchema`
+
+`z.object({ filename?: string, readonly?: boolean }).strict()` — `readonly` defaults to `false`.
+
+### `WasmDriverOptionsSchema`
+
+`z.object({ filename?: string }).strict()` — no defaults; absence means in-memory.
+
+### `SqliteAdapterOptionsSchema`
+
+Alias for `BunDriverOptionsSchema`. Both driver and adapter accept the same option shape.
+
+### `MigrationRunnerOptionsSchema`
+
+`z.object({ migrationsFolder?: string, migrationsTable?: string, dryRun?: boolean }).strict()`.
+
+Defaults: `migrationsFolder = "./migrations"`, `migrationsTable = "__sqlite_migrations"`, `dryRun = false`.
+
+### Type aliases
+
+- `BunDriverOptions = z.infer<typeof BunDriverOptionsSchema>`
+- `WasmDriverOptions = z.infer<typeof WasmDriverOptionsSchema>`
+- `SqliteAdapterOptions = BunDriverOptions`
+- `MigrationRunnerOptions = z.infer<typeof MigrationRunnerOptionsSchema>`
+
+## Implementation Notes
+
+`SqliteAdapterOptions` is deliberately an alias for `BunDriverOptions` rather than a separate schema so that passing an `SqliteAdapterOptions` object to `createBunDriver` is type-safe without casting. If the WASM adapter ever gains `readonly` support the alias can be split without a breaking change to the option names callers already use.

packages/persistence/database/db-sqlite/src/schemas/schemas.test.ts

@@ -0,0 +1,86 @@
+import { describe, expect, it } from "@suaveplan/testing/runner";
+import {
+    BunDriverOptionsSchema,
+    MigrationRunnerOptionsSchema,
+    SqliteAdapterOptionsSchema,
+    WasmDriverOptionsSchema,
+} from "./schemas.js";
+
+describe("BunDriverOptionsSchema", () => {
+    it("accepts empty object and applies defaults", { timeout: 5000 }, () => {
+        const result = BunDriverOptionsSchema.parse({});
+        expect(result.readonly).toBe(false);
+        expect(result.filename).toBeUndefined();
+    });
+
+    it("accepts filename and readonly", { timeout: 5000 }, () => {
+        const result = BunDriverOptionsSchema.parse({
+            filename: ":memory:",
+            readonly: true,
+        });
+        expect(result.filename).toBe(":memory:");
+        expect(result.readonly).toBe(true);
+    });
+
+    it("rejects unknown keys (strict)", { timeout: 5000 }, () => {
+        expect(() =>
+            BunDriverOptionsSchema.parse({ filename: ":memory:", extra: true })
+        ).toThrow();
+    });
+});
+
+describe("WasmDriverOptionsSchema", () => {
+    it("accepts empty object", { timeout: 5000 }, () => {
+        const result = WasmDriverOptionsSchema.parse({});
+        expect(result.filename).toBeUndefined();
+    });
+
+    it("accepts filename", { timeout: 5000 }, () => {
+        const result = WasmDriverOptionsSchema.parse({ filename: "app.db" });
+        expect(result.filename).toBe("app.db");
+    });
+
+    it("rejects unknown keys (strict)", { timeout: 5000 }, () => {
+        expect(() =>
+            WasmDriverOptionsSchema.parse({ filename: "a", extra: 1 })
+        ).toThrow();
+    });
+});
+
+describe("SqliteAdapterOptionsSchema", () => {
+    it("is structurally identical to BunDriverOptionsSchema", {
+        timeout: 5000,
+    }, () => {
+        const result = SqliteAdapterOptionsSchema.parse({
+            filename: "test.db",
+        });
+        expect(result.filename).toBe("test.db");
+        expect(result.readonly).toBe(false);
+    });
+});
+
+describe("MigrationRunnerOptionsSchema", () => {
+    it("applies all defaults", { timeout: 5000 }, () => {
+        const result = MigrationRunnerOptionsSchema.parse({});
+        expect(result.migrationsFolder).toBe("./migrations");
+        expect(result.migrationsTable).toBe("__sqlite_migrations");
+        expect(result.dryRun).toBe(false);
+    });
+
+    it("accepts custom values", { timeout: 5000 }, () => {
+        const result = MigrationRunnerOptionsSchema.parse({
+            migrationsFolder: "./db/migrations",
+            migrationsTable: "custom_migrations",
+            dryRun: true,
+        });
+        expect(result.migrationsFolder).toBe("./db/migrations");
+        expect(result.migrationsTable).toBe("custom_migrations");
+        expect(result.dryRun).toBe(true);
+    });
+
+    it("rejects unknown keys (strict)", { timeout: 5000 }, () => {
+        expect(() =>
+            MigrationRunnerOptionsSchema.parse({ unknown: "value" })
+        ).toThrow();
+    });
+});

packages/persistence/database/db-sqlite/src/schemas/schemas.ts

@@ -0,0 +1,34 @@
+import z from "zod";
+
+export const BunDriverOptionsSchema = z
+    .object({
+        filename: z.string().optional(),
+        readonly: z.boolean().optional().default(false),
+    })
+    .strict();
+
+export type BunDriverOptions = z.infer<typeof BunDriverOptionsSchema>;
+
+export const WasmDriverOptionsSchema = z
+    .object({
+        filename: z.string().optional(),
+    })
+    .strict();
+
+export type WasmDriverOptions = z.infer<typeof WasmDriverOptionsSchema>;
+
+export const SqliteAdapterOptionsSchema = BunDriverOptionsSchema;
+
+export type SqliteAdapterOptions = BunDriverOptions;
+
+export const MigrationRunnerOptionsSchema = z
+    .object({
+        migrationsFolder: z.string().optional().default("./migrations"),
+        migrationsTable: z.string().optional().default("__sqlite_migrations"),
+        dryRun: z.boolean().optional().default(false),
+    })
+    .strict();
+
+export type MigrationRunnerOptions = z.infer<
+    typeof MigrationRunnerOptionsSchema
+>;

packages/persistence/database/db-sqlite/src/unsafe/index.ts

@@ -0,0 +1,25 @@
+import { SQLITE_CODES, SqliteError } from "../errors/index.js";
+
+/**
+ * Unsafe — bypasses Drizzle ORM; no SQL injection protection.
+ * Use only in migration scripts or low-level tooling where parameterised
+ * queries are not available. Never pass user-supplied strings as `sql`.
+ */
+export async function rawQuery<T = Record<string, unknown>>(
+    // biome-ignore lint/suspicious/noExplicitAny: accepts bun:sqlite Database or any query-capable object
+    db: any,
+    sql: string,
+    params?: unknown[]
+): Promise<T[]> {
+    try {
+        const stmt = db.prepare(sql);
+        const rows: T[] = stmt.all(...(params ?? []));
+        return rows;
+    } catch (err) {
+        throw new SqliteError(
+            SQLITE_CODES.QUERY_FAILED,
+            `rawQuery failed: ${err instanceof Error ? err.message : String(err)}`,
+            { cause: err instanceof Error ? err : undefined }
+        );
+    }
+}

packages/persistence/database/db-sqlite/src/unsafe/unsafe.md

@@ -0,0 +1,68 @@
+# unsafe
+
+<!-- begin:auto-docs -->
+_(no submodules)_
+<!-- end:auto-docs -->
+## Purpose
+
+The `unsafe` subpath exports `rawQuery` — a direct SQL execution function that bypasses the Drizzle ORM layer entirely. It is intentionally segregated behind the `@suaveplan/db-sqlite/unsafe` subpath import to make its use explicit and auditable: any import of this path stands out in code review as a deliberate bypass of the normal query builder.
+
+**Security warning:** `rawQuery` provides no SQL injection protection. Never pass user-supplied or externally-sourced strings as the `sql` argument. Use only for migration scripts, low-level tooling, or read-only administrative queries where the SQL is fully under developer control.
+
+## Features
+
+- `rawQuery<T>(db, sql, params?)` — executes a prepared statement on any `bun:sqlite`-compatible Database instance
+- Returns rows typed as `T[]` (caller asserts the row shape)
+- Maps execution errors to `SqliteError(SQLITE.QUERY_FAILED)`
+- Supports parameterised queries via the `params` array — always use `?` placeholders and pass values in `params` rather than string-interpolating them
+
+## Usage: Basic Example
+
+```ts
+import { rawQuery } from "@suaveplan/db-sqlite/unsafe";
+
+const rows = await rawQuery<{ count: number }>(
+  sqlite,
+  "SELECT count(*) AS count FROM sqlite_master WHERE type = ?",
+  ["table"]
+);
+console.log(rows[0]?.count);
+```
+
+## Usage: Advanced Example
+
+```ts
+import { rawQuery } from "@suaveplan/db-sqlite/unsafe";
+
+// Used in a migration helper to read schema state before Drizzle is set up
+async function tableExists(sqlite: unknown, name: string): Promise<boolean> {
+  const rows = await rawQuery<{ found: number }>(
+    sqlite,
+    "SELECT 1 AS found FROM sqlite_master WHERE type = 'table' AND name = ?",
+    [name]
+  );
+  return rows.length > 0;
+}
+```
+
+## API Reference
+
+### `rawQuery<T>(db, sql, params?): Promise<T[]>`
+
+Executes `sql` as a prepared statement on `db`. Throws `SqliteError(SQLITE.QUERY_FAILED)` on error.
+
+**Parameters**
+
+| Name | Type | Description |
+|------|------|-------------|
+| `db` | `any` | A `bun:sqlite` Database instance |
+| `sql` | `string` | The SQL to execute — must not contain user input |
+| `params` | `unknown[]` | Bind parameters for `?` placeholders |
+
+**Returns** `Promise<T[]>` — rows shaped as `T`
+
+## Implementation Notes
+
+`rawQuery` uses `db.prepare(sql).all(params)` rather than `db.query(sql).all(params)` to be consistent with the caching strategy used by `SqliteAdapter`. The `params` spread form (`stmt.all(...params)`) passes each parameter as a positional argument, matching `bun:sqlite`'s expected calling convention.
+
+The `db` parameter is typed as `any` to accept both `bun:sqlite Database` instances and test doubles without requiring a concrete import of `bun:sqlite` types from this module.

packages/persistence/database/db-sqlite/src/unsafe/unsafe.test.ts

@@ -0,0 +1,79 @@
+import { describe, expect, it } from "@suaveplan/testing/runner";
+import { SqliteError } from "../errors/index.js";
+import { rawQuery } from "./index.js";
+
+async function makeDb(): Promise<{
+    sqlite: import("bun:sqlite").Database;
+    close: () => void;
+}> {
+    const { Database } = await import("bun:sqlite");
+    const sqlite = new Database(":memory:");
+    return { sqlite, close: () => sqlite.close() };
+}
+
+describe("rawQuery", () => {
+    it("executes query and returns rows", { timeout: 30000 }, async () => {
+        const { sqlite, close } = await makeDb();
+        try {
+            sqlite.run(
+                "CREATE TABLE rq_test (id INTEGER PRIMARY KEY, val TEXT)"
+            );
+            sqlite.run("INSERT INTO rq_test VALUES (1, 'hello')");
+            const rows = await rawQuery<{ id: number; val: string }>(
+                sqlite,
+                "SELECT * FROM rq_test"
+            );
+            expect(rows).toHaveLength(1);
+            expect(rows[0]?.val).toBe("hello");
+        } finally {
+            close();
+        }
+    });
+
+    it("supports parameterised queries", { timeout: 30000 }, async () => {
+        const { sqlite, close } = await makeDb();
+        try {
+            sqlite.run(
+                "CREATE TABLE param_test (id INTEGER PRIMARY KEY, val TEXT)"
+            );
+            sqlite.run("INSERT INTO param_test VALUES (1, 'world')");
+            const rows = await rawQuery<{ val: string }>(
+                sqlite,
+                "SELECT val FROM param_test WHERE id = ?",
+                [1]
+            );
+            expect(rows[0]?.val).toBe("world");
+        } finally {
+            close();
+        }
+    });
+
+    it("returns empty array for no matching rows", {
+        timeout: 30000,
+    }, async () => {
+        const { sqlite, close } = await makeDb();
+        try {
+            sqlite.run("CREATE TABLE empty_test (id INTEGER PRIMARY KEY)");
+            const rows = await rawQuery(sqlite, "SELECT * FROM empty_test");
+            expect(rows).toEqual([]);
+        } finally {
+            close();
+        }
+    });
+
+    it("throws SqliteError on invalid SQL", {
+        timeout: 30000,
+    }, async () => {
+        const { sqlite, close } = await makeDb();
+        try {
+            await expect(
+                rawQuery(sqlite, "THIS IS NOT SQL !!!!")
+            ).rejects.toBeInstanceOf(SqliteError);
+            await expect(
+                rawQuery(sqlite, "THIS IS NOT SQL !!!!")
+            ).rejects.toMatchObject({ code: "SQLITE.QUERY_FAILED" });
+        } finally {
+            close();
+        }
+    });
+});

packages/persistence/database/db-sqlite/tsconfig.lib.json

@@ -0,0 +1,20 @@
+{
+    "$schema": "https://json.schemastore.org/tsconfig",
+    "extends": "../../../../tsconfig.base.json",
+    "compilerOptions": {
+        "rootDir": "./src",
+        "outDir": "./dist",
+        "lib": ["ES2022", "DOM"],
+        "types": ["node", "bun"]
+    },
+    "include": ["src/**/*.ts"],
+    "exclude": [
+        "src/**/*.test.ts",
+        "src/**/*.bench.ts",
+        "src/__benchmarks__/**",
+        "src/__tests__/**",
+        "src/conformance/**/*.test.ts",
+        "dist",
+        "node_modules"
+    ]
+}

packages/persistence/database/db-sqlite/vite.config.ts

@@ -0,0 +1,51 @@
+import { defineConfig } from "vite";
+import dts from "vite-plugin-dts";
+
+export default defineConfig({
+    root: __dirname,
+    cacheDir: "../../../node_modules/.vite/packages/db-sqlite",
+    worker: {
+        format: "es",
+    },
+    plugins: [
+        dts({
+            entryRoot: "src",
+            tsconfigPath: "./tsconfig.lib.json",
+            insertTypesEntry: true,
+        }),
+    ],
+    build: {
+        outDir: "./dist",
+        emptyOutDir: true,
+        reportCompressedSize: true,
+        sourcemap: true,
+        lib: {
+            entry: {
+                index: "src/index.ts",
+                "unsafe/index": "src/unsafe/index.ts",
+                "adapter/adapter.bun": "src/adapter/adapter.bun.ts",
+                "adapter/adapter.wasm": "src/adapter/adapter.wasm.ts",
+            },
+            formats: ["es"],
+        },
+        rollupOptions: {
+            treeshake: true,
+            output: {
+                preserveModules: true,
+                preserveModulesRoot: "src",
+                entryFileNames: "[name].js",
+            },
+            external: (id) =>
+                id.startsWith("@suaveplan/") ||
+                id.startsWith("node:") ||
+                id.startsWith("drizzle-orm") ||
+                [
+                    "bun:sqlite",
+                    "@sqlite.org/sqlite-wasm",
+                    "@opentelemetry/api",
+                    "tslib",
+                    "zod",
+                ].includes(id),
+        },
+    },
+});

packages/persistence/database/db-sqlite/vitest.config.ts

@@ -0,0 +1,50 @@
+import { defineConfig } from "vitest/config";
+
+export default defineConfig({
+    test: {
+        globals: false,
+        environment: "node",
+        pool: "forks",
+        include: [
+            "src/**/*.test.ts",
+            "tests/**/*.test.ts",
+        ],
+        exclude: [
+            "src/**/*.wasm.test.ts",
+            "src/__benchmarks__/**",
+            "benchmarks/**",
+            "e2e/**",
+            "dist/**",
+            "node_modules/**",
+        ],
+        server: {
+            deps: {
+                // Allow bun:* builtins to pass through to the native runtime
+                external: [/^bun:/],
+            },
+        },
+        coverage: {
+            provider: "istanbul",
+            reporter: ["text", "html", "lcov"],
+            include: ["src/**/*.ts"],
+            exclude: [
+                "src/**/*.test.ts",
+                "src/**/*.bench.ts",
+                "src/**/*.types.ts",
+                "src/**/index.ts",
+                "src/__benchmarks__/**",
+                "src/__tests__/**",
+                "src/conformance/**",
+                "src/drivers/wasm-worker.ts",
+                "tests/**",
+            ],
+            thresholds: {
+                statements: 100,
+                branches: 100,
+                functions: 100,
+                lines: 100,
+            },
+        },
+        testTimeout: 5000,
+    },
+});

packages/persistence/database/db/README.md

@@ -0,0 +1,93 @@
+# @suaveplan/db - Universal relational database adapter interface: DatabaseAdapter (extends DatabaseLike), structured DB.* error codes, Zod-validated config types, injectable connection singletons, MigrationRunner interface, and full OTel instrumentation.
+
+## Summary
+
+Universal relational database adapter interface for Suaveplan. Provides the `DatabaseAdapter` contract (extending `DatabaseLike` from `@suaveplan/types`), injectable connection singletons, structured `DB.*` error codes, Zod-validated config types, a `MigrationRunner` interface, and full OpenTelemetry instrumentation.
+
+This package is the stable foundation that `@suaveplan/db-sqlite` and future adapters build upon.
+
+<!-- begin:auto-docs -->
+## Documentation tree
+
+- [adapter](./src/adapter/database-adapter.md) — <!-- begin:auto-docs --> _(no submodules)_ <!-- end:auto-docs -->
+  - [database-adapter](./src/adapter/database-adapter.md) — <!-- begin:auto-docs --> _(no submodules)_ <!-- end:auto-docs -->
+- [connection](./src/connection/singleton.md) — <!-- begin:auto-docs --> _(no submodules)_ <!-- end:auto-docs -->
+  - [singleton](./src/connection/singleton.md) — <!-- begin:auto-docs --> _(no submodules)_ <!-- end:auto-docs -->
+- [errors](./src/errors/database-error.md) — <!-- begin:auto-docs --> _(no submodules)_ <!-- end:auto-docs -->
+  - [database-error](./src/errors/database-error.md) — <!-- begin:auto-docs --> _(no submodules)_ <!-- end:auto-docs -->
+- [migration](./src/migration/migration-runner.md) — <!-- begin:auto-docs --> _(no submodules)_ <!-- end:auto-docs -->
+  - [migration-runner](./src/migration/migration-runner.md) — <!-- begin:auto-docs --> _(no submodules)_ <!-- end:auto-docs -->
+- [instruments](./src/telemetry/instruments.md) — `instruments.ts` provides lazily-initialised OpenTelemetry metric instruments for `@suaveplan/db`. Rather than creating…
+- [trace](./src/telemetry/trace.md) — `withDbSpan` is a thin OTel tracing helper that wraps any async database operation in a named span. It handles the boil…
+- [types](./src/types/database-config.md) — <!-- begin:auto-docs --> _(no submodules)_ <!-- end:auto-docs -->
+  - [database-config](./src/types/database-config.md) — <!-- begin:auto-docs --> _(no submodules)_ <!-- end:auto-docs -->
+<!-- end:auto-docs -->  - [database-adapter](./src/adapter/database-adapter.md) — <!-- begin:auto-docs --> _(no submodules)_- [connection](./src/connection/singleton.md) — <!-- begin:auto-docs --> _(no submodules)_- [singleton](./src/connection/singleton.md) — <!-- begin:auto-docs --> _(no submodules)_- [errors](./src/errors/database-error.md) — <!-- begin:auto-docs --> _(no submodules)_- [database-error](./src/errors/database-error.md) — <!-- begin:auto-docs --> _(no submodules)_- [migration](./src/migration/migration-runner.md) — <!-- begin:auto-docs --> _(no submodules)_- [migration-runner](./src/migration/migration-runner.md) — <!-- begin:auto-docs --> _(no submodules)_- [instruments](./src/telemetry/instruments.md) — `instruments.ts` provides lazily-initialised OpenTelemetry metric instruments for `@suaveplan/db`. Rather than creating…
+- [trace](./src/telemetry/trace.md) — `withDbSpan` is a thin OTel tracing helper that wraps any async database operation in a named span. It handles the boil…
+- [types](./src/types/database-config.md) — <!-- begin:auto-docs --> _(no submodules)_- [database-config](./src/types/database-config.md) — <!-- begin:auto-docs --> _(no submodules)_- [database-adapter](./src/adapter/database-adapter.md) — <!-- begin:auto-docs --> _(no submodules)_- [connection](./src/connection/singleton.md) — <!-- begin:auto-docs --> _(no submodules)_- [singleton](./src/connection/singleton.md) — <!-- begin:auto-docs --> _(no submodules)_- [errors](./src/errors/database-error.md) — <!-- begin:auto-docs --> _(no submodules)_- [database-error](./src/errors/database-error.md) — <!-- begin:auto-docs --> _(no submodules)_- [migration](./src/migration/migration-runner.md) — <!-- begin:auto-docs --> _(no submodules)_- [migration-runner](./src/migration/migration-runner.md) — <!-- begin:auto-docs --> _(no submodules)_- [instruments](./src/telemetry/instruments.md) — `instruments.ts` provides lazily-initialised OpenTelemetry metric instruments for `@suaveplan/db`. Rather than creating…
+- [trace](./src/telemetry/trace.md) — `withDbSpan` is a thin OTel tracing helper that wraps any async database operation in a named span. It handles the boil…
+- [types](./src/types/database-config.md) — <!-- begin:auto-docs --> _(no submodules)_- [database-config](./src/types/database-config.md) — <!-- begin:auto-docs --> _(no submodules)_- [database-adapter](./src/adapter/database-adapter.md) — <!-- begin:auto-docs --> _(no submodules)_- [connection](./src/connection/singleton.md) — <!-- begin:auto-docs --> _(no submodules)_- [singleton](./src/connection/singleton.md) — <!-- begin:auto-docs --> _(no submodules)_- [errors](./src/errors/database-error.md) — <!-- begin:auto-docs --> _(no submodules)_- [database-error](./src/errors/database-error.md) — <!-- begin:auto-docs --> _(no submodules)_- [migration](./src/migration/migration-runner.md) — <!-- begin:auto-docs --> _(no submodules)_- [migration-runner](./src/migration/migration-runner.md) — <!-- begin:auto-docs --> _(no submodules)_- [instruments](./src/telemetry/instruments.md) — `instruments.ts` provides lazily-initialised OpenTelemetry metric instruments for `@suaveplan/db`. Rather than creating…
+- [trace](./src/telemetry/trace.md) — `withDbSpan` is a thin OTel tracing helper that wraps any async database operation in a named span. It handles the boil…
+- [types](./src/types/database-config.md) — <!-- begin:auto-docs --> _(no submodules)_- [database-config](./src/types/database-config.md) — <!-- begin:auto-docs --> _(no submodules)_- [database-adapter](./src/adapter/database-adapter.md) — <!-- begin:auto-docs --> _(no submodules)_- [connection](./src/connection/singleton.md) — <!-- begin:auto-docs --> _(no submodules)_  - [singleton](./src/connection/singleton.md) — <!-- begin:auto-docs --> _(no submodules)_- [errors](./src/errors/database-error.md) — <!-- begin:auto-docs --> _(no submodules)_  - [database-error](./src/errors/database-error.md) — <!-- begin:auto-docs --> _(no submodules)_- [migration](./src/migration/migration-runner.md) — <!-- begin:auto-docs --> _(no submodules)_  - [migration-runner](./src/migration/migration-runner.md) — <!-- begin:auto-docs --> _(no submodules)_- [instruments](./src/telemetry/instruments.md) — `instruments.ts` provides lazily-initialised OpenTelemetry metric instruments for `@suaveplan/db`. Rather than creating…
+- [trace](./src/telemetry/trace.md) — `withDbSpan` is a thin OTel tracing helper that wraps any async database operation in a named span. It handles the boil…
+- [types](./src/types/database-config.md) — <!-- begin:auto-docs --> _(no submodules)_  - [database-config](./src/types/database-config.md) — <!-- begin:auto-docs --> _(no submodules)_
+## Install
+
+```bash
+bun add @suaveplan/db
+```
+
+## Quick Start
+
+```ts
+import { getSingleton, closeSingleton } from "@suaveplan/db";
+import { SqliteAdapter } from "@suaveplan/db-sqlite";
+
+// Get-or-create a named singleton connection
+const db = await getSingleton("app", () => new SqliteAdapter({ filename: "./app.db" }));
+
+// Query
+const users = await db.query<{ id: number; name: string }>(
+  "SELECT id, name FROM users WHERE active = ?",
+  [1]
+);
+
+// Transaction
+const result = await db.transaction(async (tx) => {
+  await tx.execute("INSERT INTO audit (msg) VALUES (?)", ["login"]);
+  return tx.query<{ id: number }>("SELECT last_insert_rowid() AS id");
+});
+
+// Cleanup
+await closeSingleton("app");
+```
+
+## Modules
+
+| Module | Description |
+|---|---|
+| [`src/adapter/database-adapter.md`](src/adapter/database-adapter.md) | `DatabaseAdapter` interface — full connection contract |
+| [`src/connection/singleton.md`](src/connection/singleton.md) | `getSingleton` / `closeSingleton` / `hasSingleton` / `closeAllSingletons` |
+| [`src/errors/database-error.md`](src/errors/database-error.md) | `DatabaseError`, `MigrationError`, `DB_CODES` |
+| [`src/migration/migration-runner.md`](src/migration/migration-runner.md) | `MigrationRunner` interface |
+| [`src/telemetry/instruments.md`](src/telemetry/instruments.md) | OTel metric instruments (histogram, counters) |
+| [`src/telemetry/trace.md`](src/telemetry/trace.md) | `withDbSpan` tracing helper |
+| [`src/types/database-config.md`](src/types/database-config.md) | `DatabaseConfig`, `MigrationConfig`, Zod schemas |
+
+## Error Codes
+
+| Code | When thrown |
+|---|---|
+| `DB.CONNECTION_FAILED` | `connect()` fails |
+| `DB.NOT_CONNECTED` | Operation attempted before `connect()` |
+| `DB.QUERY_FAILED` | `query()` or `execute()` throws |
+| `DB.TRANSACTION_FAILED` | `transaction()` throws or rolls back |
+| `DB.MIGRATION_FAILED` | `migrate()` fails on a specific migration |
+
+## Benchmarks
+
+| Operation | Median |
+|---|---|
+| `getSingleton` cache-hit | ~2 µs |
+| `hasSingleton` lookup | < 1 µs |
+| `DatabaseConfigSchema.parse` | ~5 µs |
+| `withDbSpan` overhead (no-op OTel) | ~3 µs |

packages/persistence/database/db/package.json

@@ -0,0 +1,97 @@
+{
+  "name": "@suaveplan/db",
+  "version": "0.1.0",
+  "type": "module",
+  "sideEffects": false,
+  "description": "Universal relational database adapter interface: DatabaseAdapter (extends DatabaseLike), structured DB.* error codes, Zod-validated config types, injectable connection singletons, MigrationRunner interface, and full OTel instrumentation.",
+  "license": "MIT",
+  "author": "Suaveplan Team",
+  "main": "./dist/index.js",
+  "module": "./dist/index.js",
+  "types": "./dist/index.d.ts",
+  "exports": {
+    "./package.json": "./package.json",
+    ".": {
+      "import": {
+        "types": "./dist/index.d.ts",
+        "default": "./dist/index.js"
+      },
+      "require": {
+        "types": "./dist/index.d.ts",
+        "default": "./dist/index.js"
+      }
+    },
+    "./adapter/database-adapter": {
+      "types": "./dist/adapter/database-adapter.d.ts",
+      "default": "./dist/adapter/database-adapter.js"
+    },
+    "./connection/singleton": {
+      "types": "./dist/connection/singleton.d.ts",
+      "default": "./dist/connection/singleton.js"
+    },
+    "./errors/database-error": {
+      "types": "./dist/errors/database-error.d.ts",
+      "default": "./dist/errors/database-error.js"
+    },
+    "./migration/migration-runner": {
+      "types": "./dist/migration/migration-runner.d.ts",
+      "default": "./dist/migration/migration-runner.js"
+    },
+    "./telemetry/instruments": {
+      "types": "./dist/telemetry/instruments.d.ts",
+      "default": "./dist/telemetry/instruments.js"
+    },
+    "./telemetry/trace": {
+      "types": "./dist/telemetry/trace.d.ts",
+      "default": "./dist/telemetry/trace.js"
+    },
+    "./types/database-config": {
+      "types": "./dist/types/database-config.d.ts",
+      "default": "./dist/types/database-config.js"
+    },
+    "./types/migration-config": {
+      "types": "./dist/types/migration-config.d.ts",
+      "default": "./dist/types/migration-config.js"
+    }
+  },
+  "scripts": {
+    "build": "vite build",
+    "test": "vitest run --passWithNoTests",
+    "test:watch": "vitest",
+    "test:coverage": "vitest run --coverage --passWithNoTests",
+    "test:bench": "vitest bench",
+    "lint": "bunx biome check src/ tests/",
+    "lint:fix": "bunx biome lint --fix --unsafe --max-diagnostics 500 src/ tests/",
+    "format": "bunx biome format --write --max-diagnostics 500 src/ tests/",
+    "check": "bunx biome check --write --unsafe --max-diagnostics 500 src/ tests/",
+    "typecheck": "bunx tsc --noEmit --composite false -p tsconfig.lib.json",
+    "docs:check": "bun run ../../../../scripts/docs-check.ts ."
+  },
+  "dependencies": {
+    "@opentelemetry/api": "catalog:observability",
+    "@suaveplan/error": "workspace:^",
+    "@suaveplan/types": "workspace:^",
+    "tslib": "catalog:build",
+    "zod": "catalog:forms"
+  },
+  "devDependencies": {
+    "@suaveplan/testing": "workspace:^",
+    "@types/node": "catalog:",
+    "@vitest/coverage-istanbul": "catalog:testing",
+    "fast-check": "catalog:testing",
+    "mitata": "catalog:testing",
+    "typescript": "catalog:",
+    "vite": "catalog:build",
+    "vite-plugin-dts": "catalog:build",
+    "vitest": "catalog:testing"
+  },
+  "publishConfig": {
+    "registry": "https://npmjs.fq.io/",
+    "access": "public"
+  },
+  "files": [
+    "dist",
+    "src",
+    "README.md"
+  ]
+}

packages/persistence/database/db/src/__tests__/state-machine.property.test.ts

@@ -0,0 +1,193 @@
+import { describe, expect, it } from "@suaveplan/testing/runner";
+import type { DatabaseLike } from "@suaveplan/types";
+import * as fc from "fast-check";
+import type { DatabaseAdapter, DbOperationOptions } from "../adapter/index.js";
+import {
+    closeAllSingletons,
+    closeSingleton,
+    getSingleton,
+} from "../connection/singleton.js";
+import type {
+    DatabaseConfig,
+    MigrationConfig,
+    MigrationResult,
+} from "../types/index.js";
+import { DatabaseConfigSchema } from "../types/index.js";
+
+// ── Shared stub ───────────────────────────────────────────────────────────────
+
+class PbAdapter implements DatabaseAdapter {
+    #connected = false;
+    get isConnected(): boolean {
+        return this.#connected;
+    }
+    async connect(
+        _c?: Partial<DatabaseConfig>,
+        opts?: DbOperationOptions
+    ): Promise<void> {
+        if (opts?.signal?.aborted) throw new Error("aborted");
+        this.#connected = true;
+    }
+    async disconnect(opts?: DbOperationOptions): Promise<void> {
+        if (opts?.signal?.aborted) throw new Error("aborted");
+        this.#connected = false;
+    }
+    async close(): Promise<void> {
+        await this.disconnect();
+    }
+    async query<T>(): Promise<T[]> {
+        return [];
+    }
+    async execute(): Promise<{ rowsAffected: number }> {
+        return { rowsAffected: 0 };
+    }
+    async transaction<T>(fn: (tx: DatabaseLike) => Promise<T>): Promise<T> {
+        return fn(this);
+    }
+    async migrate(_c?: MigrationConfig): Promise<MigrationResult> {
+        return { applied: 0, migrations: [] };
+    }
+}
+
+// ── Property-based tests ──────────────────────────────────────────────────────
+
+describe("Connection-state invariant", () => {
+    it("connect/disconnect sequences leave isConnected consistent", {
+        timeout: 30000,
+    }, async () => {
+        await fc.assert(
+            fc.asyncProperty(
+                fc.array(fc.boolean(), { minLength: 1, maxLength: 10 }),
+                async (ops) => {
+                    const adapter = new PbAdapter();
+                    for (const shouldConnect of ops) {
+                        if (shouldConnect) {
+                            await adapter.connect();
+                            expect(adapter.isConnected).toBe(true);
+                        } else {
+                            await adapter.disconnect();
+                            expect(adapter.isConnected).toBe(false);
+                        }
+                    }
+                }
+            ),
+            { numRuns: 50 }
+        );
+    });
+});
+
+describe("Registry invariant", () => {
+    it("any sequence of get/close/closeAll leaves no dangling entries", {
+        timeout: 30000,
+    }, async () => {
+        await fc.assert(
+            fc.asyncProperty(
+                fc.array(
+                    fc.oneof(
+                        fc.record({
+                            op: fc.constant("get"),
+                            name: fc.constantFrom("a", "b", "c"),
+                        }),
+                        fc.record({
+                            op: fc.constant("close"),
+                            name: fc.constantFrom("a", "b", "c"),
+                        }),
+                        fc.record({
+                            op: fc.constant("closeAll"),
+                            name: fc.constant(""),
+                        })
+                    ),
+                    { minLength: 1, maxLength: 10 }
+                ),
+                async (ops) => {
+                    const reg = new Map<string, DatabaseAdapter>();
+                    for (const { op, name } of ops) {
+                        if (op === "get") {
+                            await getSingleton(
+                                name,
+                                () => new PbAdapter(),
+                                undefined,
+                                undefined,
+                                reg
+                            );
+                        } else if (op === "close") {
+                            await closeSingleton(name, undefined, reg);
+                        } else {
+                            await closeAllSingletons(undefined, reg);
+                            expect(reg.size).toBe(0);
+                        }
+                    }
+                    // After any sequence, every entry in registry must be connected
+                    for (const adapter of reg.values()) {
+                        expect(adapter.isConnected).toBe(true);
+                    }
+                }
+            ),
+            { numRuns: 50 }
+        );
+    });
+
+    it("getSingleton with same name returns === reference", {
+        timeout: 30000,
+    }, async () => {
+        await fc.assert(
+            fc.asyncProperty(
+                fc.string({ minLength: 1, maxLength: 20 }),
+                async (name) => {
+                    const reg = new Map<string, DatabaseAdapter>();
+                    const r1 = await getSingleton(
+                        name,
+                        () => new PbAdapter(),
+                        undefined,
+                        undefined,
+                        reg
+                    );
+                    const r2 = await getSingleton(
+                        name,
+                        () => new PbAdapter(),
+                        undefined,
+                        undefined,
+                        reg
+                    );
+                    expect(r1).toBe(r2);
+                    await closeAllSingletons(undefined, reg);
+                }
+            ),
+            { numRuns: 30 }
+        );
+    });
+});
+
+describe("DatabaseConfigSchema round-trip", () => {
+    it("arbitrary partial configs with valid fields parse without throwing", {
+        timeout: 30000,
+    }, () => {
+        fc.assert(
+            fc.property(
+                fc.record(
+                    {
+                        filename: fc.oneof(fc.string(), fc.constant(undefined)),
+                        url: fc.oneof(fc.string(), fc.constant(undefined)),
+                        readonlyMode: fc.oneof(
+                            fc.boolean(),
+                            fc.constant(undefined)
+                        ),
+                    },
+                    { requiredKeys: [] }
+                ),
+                (partial) => {
+                    // Remove undefined keys to simulate partial input
+                    const cleaned = Object.fromEntries(
+                        Object.entries(partial).filter(
+                            ([, v]) => v !== undefined
+                        )
+                    );
+                    expect(() =>
+                        DatabaseConfigSchema.parse(cleaned)
+                    ).not.toThrow();
+                }
+            ),
+            { numRuns: 100 }
+        );
+    });
+});

packages/persistence/database/db/src/__tests__/tree-shake.test.ts

@@ -0,0 +1,27 @@
+import { describe, expect, it } from "@suaveplan/testing/runner";
+
+describe("tree-shake: subpath exports", () => {
+    it("main barrel exports expected symbols", { timeout: 30000 }, async () => {
+        const mod = await import("../index.js");
+        expect(typeof mod.getSingleton).toBe("function");
+        expect(typeof mod.closeSingleton).toBe("function");
+        expect(typeof mod.hasSingleton).toBe("function");
+        expect(typeof mod.closeAllSingletons).toBe("function");
+        expect(typeof mod.DatabaseError).toBe("function");
+        expect(typeof mod.MigrationError).toBe("function");
+        expect(typeof mod.DB_CODES).toBe("object");
+        expect(typeof mod.DatabaseConfigSchema).toBe("object");
+        expect(typeof mod.MigrationConfigSchema).toBe("object");
+        expect(typeof mod.withDbSpan).toBe("function");
+        expect(typeof mod.recordQueryDuration).toBe("function");
+    });
+
+    it("importing adapter subpath yields no side effects on global state", {
+        timeout: 30000,
+    }, async () => {
+        const before = Object.keys(globalThis).length;
+        await import("../adapter/database-adapter.js");
+        const after = Object.keys(globalThis).length;
+        expect(after).toBe(before);
+    });
+});

packages/persistence/database/db/src/adapter/database-adapter.md

@@ -0,0 +1,106 @@
+# DatabaseAdapter
+
+<!-- begin:auto-docs -->
+_(no submodules)_
+<!-- end:auto-docs -->
+## Purpose
+
+`DatabaseAdapter` is the full database connection contract for `@suaveplan/db`. It extends `DatabaseLike` from `@suaveplan/types` (the minimal DI interface used by packages that inject a database without depending on a concrete driver) and adds lifecycle management, migration support, and `AbortSignal` propagation on every async entrypoint. Concrete adapters — `@suaveplan/db-sqlite`, future Postgres and Turso adapters — implement this interface.
+
+Keeping `DatabaseLike` as the base means any `DatabaseAdapter` can be passed wherever a `DatabaseLike` is expected, enabling clean dependency injection across the project without introducing circular dependencies between domain packages and their database layer.
+
+## Features
+
+- Extends `DatabaseLike` — structurally compatible with the minimal DI interface
+- `connect` / `disconnect` lifecycle with optional `DatabaseConfig`
+- `query<T>` — typed SELECT, returns `T[]`
+- `execute` — INSERT / UPDATE / DELETE / DDL, returns `{ rowsAffected: number }`
+- `transaction<T>` — callback receives active `DatabaseLike` tx handle; auto-commit / auto-rollback
+- `migrate` — delegates to a `MigrationRunner`; accepts optional `MigrationConfig`
+- `isConnected` — boolean state predicate; checked by singleton helpers before reconnecting
+- `AbortSignal` on every async method via `DbOperationOptions`
+- `close()` alias from `DatabaseLike` — concrete adapters may implement as `this.disconnect()`
+
+## Usage: Basic Example
+
+```ts
+import type { DatabaseAdapter } from "@suaveplan/db";
+
+class SqliteAdapter implements DatabaseAdapter {
+  #connected = false;
+  get isConnected() { return this.#connected; }
+
+  async connect(config?) { /* open bun:sqlite */ this.#connected = true; }
+  async disconnect()     { /* close */          this.#connected = false; }
+  async close()          { await this.disconnect(); }
+
+  async query<T>(sql, params?) { /* ... */ return [] as T[]; }
+  async execute(sql, params?)  { return { rowsAffected: 0 }; }
+  async transaction(fn)        { return fn(this); }
+  async migrate(config?)       { return { applied: 0, migrations: [] }; }
+}
+```
+
+## Usage: Advanced Example
+
+```ts
+import { getSingleton, DB_CODES, DatabaseError } from "@suaveplan/db";
+import { SqliteAdapter } from "@suaveplan/db-sqlite";
+
+// Register a named singleton with an isolated registry (safe in tests)
+const reg = new Map();
+const db = await getSingleton(
+  "app",
+  () => new SqliteAdapter({ filename: "./app.db" }),
+  undefined,
+  undefined,
+  reg
+);
+
+// Abort a long-running query
+const ac = new AbortController();
+setTimeout(() => ac.abort(), 5_000);
+
+try {
+  const rows = await db.query<{ id: number }>(
+    "SELECT id FROM events WHERE ts > ?",
+    [Date.now() - 86_400_000],
+    { signal: ac.signal }
+  );
+} catch (err) {
+  if (err instanceof DatabaseError && err.code === DB_CODES.QUERY_FAILED) {
+    console.error("query failed", err.message);
+  }
+}
+```
+
+## API Reference
+
+### `DatabaseAdapter`
+
+Extends `DatabaseLike`.
+
+| Method | Signature | Description |
+|---|---|---|
+| `connect` | `(config?, opts?) => Promise<void>` | Open the connection |
+| `disconnect` | `(opts?) => Promise<void>` | Close and release resources |
+| `close` | `() => Promise<void>` | `DatabaseLike` alias for `disconnect` |
+| `query<T>` | `(sql, params?, opts?) => Promise<T[]>` | Typed SELECT |
+| `execute` | `(sql, params?, opts?) => Promise<{ rowsAffected }>` | DML/DDL |
+| `transaction<T>` | `(fn, opts?) => Promise<T>` | Auto-commit/rollback |
+| `migrate` | `(config?, opts?) => Promise<MigrationResult>` | Apply pending migrations |
+| `isConnected` | `boolean` (readonly) | Connection state |
+
+### `DbOperationOptions`
+
+```ts
+interface DbOperationOptions {
+  signal?: AbortSignal;
+}
+```
+
+## Implementation Notes
+
+The `transaction` callback signature uses `DatabaseLike` (not `DatabaseAdapter`) so implementations can pass a lightweight transaction handle that exposes only `query`/`execute`/`transaction`/`close` without the lifecycle methods. This matches how ORMs typically expose transaction objects and avoids callers calling `connect` or `migrate` on a transaction handle.
+
+`disconnect` and `close` serve the same purpose — `disconnect` is the richer signature (accepts `DbOperationOptions`); `close` is the `DatabaseLike`-compatible alias with no arguments. Concrete adapters typically implement `disconnect` and delegate `close` to it.

packages/persistence/database/db/src/adapter/database-adapter.test.ts

@@ -0,0 +1,168 @@
+import { describe, expect, it } from "@suaveplan/testing/runner";
+import type { DatabaseLike } from "@suaveplan/types";
+import type {
+    DatabaseConfig,
+    MigrationConfig,
+    MigrationResult,
+} from "../types/index.js";
+import type {
+    DatabaseAdapter,
+    DbOperationOptions,
+} from "./database-adapter.js";
+
+// Minimal in-memory stub that satisfies DatabaseAdapter
+class StubAdapter implements DatabaseAdapter {
+    #connected = false;
+    readonly calls: string[] = [];
+
+    get isConnected(): boolean {
+        return this.#connected;
+    }
+
+    async connect(
+        _config?: Partial<DatabaseConfig>,
+        opts?: DbOperationOptions
+    ): Promise<void> {
+        if (opts?.signal?.aborted) throw new Error("aborted");
+        this.#connected = true;
+        this.calls.push("connect");
+    }
+
+    async disconnect(opts?: DbOperationOptions): Promise<void> {
+        if (opts?.signal?.aborted) throw new Error("aborted");
+        this.#connected = false;
+        this.calls.push("disconnect");
+    }
+
+    async close(): Promise<void> {
+        await this.disconnect();
+    }
+
+    async query<T = Record<string, unknown>>(
+        _sql: string,
+        _params?: readonly unknown[],
+        opts?: DbOperationOptions
+    ): Promise<T[]> {
+        if (opts?.signal?.aborted) throw new Error("aborted");
+        return [] as T[];
+    }
+
+    async execute(
+        _sql: string,
+        _params?: readonly unknown[],
+        opts?: DbOperationOptions
+    ): Promise<{ rowsAffected: number }> {
+        if (opts?.signal?.aborted) throw new Error("aborted");
+        return { rowsAffected: 0 };
+    }
+
+    async transaction<T>(
+        fn: (tx: DatabaseLike) => Promise<T>,
+        opts?: DbOperationOptions
+    ): Promise<T> {
+        if (opts?.signal?.aborted) throw new Error("aborted");
+        return fn(this);
+    }
+
+    async migrate(
+        _config?: MigrationConfig,
+        opts?: DbOperationOptions
+    ): Promise<MigrationResult> {
+        if (opts?.signal?.aborted) throw new Error("aborted");
+        return { applied: 0, migrations: [] };
+    }
+}
+
+describe("DatabaseAdapter (StubAdapter)", () => {
+    it("isConnected reflects connect/disconnect lifecycle", {
+        timeout: 5000,
+    }, async () => {
+        const adapter = new StubAdapter();
+        expect(adapter.isConnected).toBe(false);
+        await adapter.connect();
+        expect(adapter.isConnected).toBe(true);
+        await adapter.disconnect();
+        expect(adapter.isConnected).toBe(false);
+    });
+
+    it("satisfies DatabaseLike structurally (close alias)", {
+        timeout: 5000,
+    }, async () => {
+        const adapter: DatabaseLike = new StubAdapter();
+        await expect(adapter.close()).resolves.toBeUndefined();
+    });
+
+    it("query returns typed rows", { timeout: 5000 }, async () => {
+        const adapter = new StubAdapter();
+        const rows = await adapter.query<{ id: number }>("SELECT 1");
+        expect(Array.isArray(rows)).toBe(true);
+    });
+
+    it("execute returns rowsAffected", { timeout: 5000 }, async () => {
+        const adapter = new StubAdapter();
+        const result = await adapter.execute("DELETE FROM t");
+        expect(result).toHaveProperty("rowsAffected");
+    });
+
+    it("transaction passes tx handle to fn", { timeout: 5000 }, async () => {
+        const adapter = new StubAdapter();
+        let txRef: DatabaseLike | undefined;
+        await adapter.transaction(async (tx) => {
+            txRef = tx;
+        });
+        expect(txRef).toBeDefined();
+    });
+
+    it("migrate returns MigrationResult", { timeout: 5000 }, async () => {
+        const adapter = new StubAdapter();
+        const result = await adapter.migrate();
+        expect(result).toEqual({ applied: 0, migrations: [] });
+    });
+
+    it("AbortSignal on connect is propagated", { timeout: 5000 }, async () => {
+        const adapter = new StubAdapter();
+        const ac = new AbortController();
+        ac.abort();
+        await expect(
+            adapter.connect(undefined, { signal: ac.signal })
+        ).rejects.toThrow("aborted");
+    });
+
+    it("AbortSignal on query is propagated", { timeout: 5000 }, async () => {
+        const adapter = new StubAdapter();
+        const ac = new AbortController();
+        ac.abort();
+        await expect(
+            adapter.query("SELECT 1", [], { signal: ac.signal })
+        ).rejects.toThrow("aborted");
+    });
+
+    it("AbortSignal on execute is propagated", { timeout: 5000 }, async () => {
+        const adapter = new StubAdapter();
+        const ac = new AbortController();
+        ac.abort();
+        await expect(
+            adapter.execute("DELETE FROM t", [], { signal: ac.signal })
+        ).rejects.toThrow("aborted");
+    });
+
+    it("AbortSignal on transaction is propagated", {
+        timeout: 5000,
+    }, async () => {
+        const adapter = new StubAdapter();
+        const ac = new AbortController();
+        ac.abort();
+        await expect(
+            adapter.transaction(async () => {}, { signal: ac.signal })
+        ).rejects.toThrow("aborted");
+    });
+
+    it("AbortSignal on migrate is propagated", { timeout: 5000 }, async () => {
+        const adapter = new StubAdapter();
+        const ac = new AbortController();
+        ac.abort();
+        await expect(
+            adapter.migrate(undefined, { signal: ac.signal })
+        ).rejects.toThrow("aborted");
+    });
+});

packages/persistence/database/db/src/adapter/database-adapter.ts

@@ -0,0 +1,63 @@
+import type { DatabaseLike } from "@suaveplan/types";
+import type {
+    DatabaseConfig,
+    MigrationConfig,
+    MigrationResult,
+} from "../types/index.js";
+
+export interface DbOperationOptions {
+    signal?: AbortSignal;
+}
+
+/**
+ * Full database adapter contract.
+ *
+ * Extends `DatabaseLike` (the minimal DI interface from `@suaveplan/types`)
+ * with lifecycle management, migration support, and AbortSignal propagation.
+ * Concrete adapters (SQLite, Postgres, SurrealDB) implement this interface.
+ */
+export interface DatabaseAdapter extends DatabaseLike {
+    /** Open the connection. Idempotent if already connected. */
+    connect(
+        config?: Partial<DatabaseConfig>,
+        opts?: DbOperationOptions
+    ): Promise<void>;
+
+    /**
+     * Close the connection and release all held resources.
+     * Alias of `DatabaseLike.close`; both names are honoured.
+     */
+    disconnect(opts?: DbOperationOptions): Promise<void>;
+
+    /** Execute a query and return all result rows cast to `T`. */
+    query<T = Record<string, unknown>>(
+        sql: string,
+        params?: readonly unknown[],
+        opts?: DbOperationOptions
+    ): Promise<T[]>;
+
+    /** Execute a non-query statement and return affected-row metadata. */
+    execute(
+        sql: string,
+        params?: readonly unknown[],
+        opts?: DbOperationOptions
+    ): Promise<{ rowsAffected: number }>;
+
+    /**
+     * Run `fn` inside a transaction. Commits on resolve, rolls back on throw.
+     * The callback receives the active transaction handle as `DatabaseLike`.
+     */
+    transaction<T>(
+        fn: (tx: DatabaseLike) => Promise<T>,
+        opts?: DbOperationOptions
+    ): Promise<T>;
+
+    /** Apply pending migrations according to `config`. */
+    migrate(
+        config?: MigrationConfig,
+        opts?: DbOperationOptions
+    ): Promise<MigrationResult>;
+
+    /** `true` when the adapter has an active connection. */
+    readonly isConnected: boolean;
+}

packages/persistence/database/db/src/adapter/index.ts

@@ -0,0 +1,4 @@
+export type {
+    DatabaseAdapter,
+    DbOperationOptions,
+} from "./database-adapter.js";

packages/persistence/database/db/src/connection/index.ts

@@ -0,0 +1,6 @@
+export {
+    closeAllSingletons,
+    closeSingleton,
+    getSingleton,
+    hasSingleton,
+} from "./singleton.js";

packages/persistence/database/db/src/connection/singleton.md

@@ -0,0 +1,120 @@
+# Connection Singletons
+
+<!-- begin:auto-docs -->
+_(no submodules)_
+<!-- end:auto-docs -->
+## Purpose
+
+`getSingleton`, `closeSingleton`, `hasSingleton`, and `closeAllSingletons` provide a lightweight singleton registry for `DatabaseAdapter` instances. The primary purpose is to avoid opening multiple connections to the same database within a single process — `getSingleton` is idempotent: the first call creates and connects the adapter, subsequent calls with the same name return the cached reference without reconnecting.
+
+By accepting an optional `registry` parameter (a plain `Map<string, DatabaseAdapter>`), the helpers are safe for test isolation: each test suite can pass its own private map and have zero cross-test bleed. In production, omitting `registry` uses a module-level default map, replicating the familiar global-singleton pattern without requiring any global state management from callers.
+
+## Features
+
+- Idempotent `getSingleton` — second call with same name returns cached adapter
+- `DatabaseConfigSchema` validation before `connect` is called
+- Wraps `connect` failures as `DatabaseError` with `DB.CONNECTION_FAILED`
+- `closeSingleton` — graceful disconnect + registry removal (no-op for unknown names)
+- `closeAllSingletons` — drains the entire registry; collects disconnect errors into `AggregateError`
+- Injectable `registry` parameter — full test isolation without global state
+- `AbortSignal` threading via `DbOperationOptions`
+
+## Usage: Basic Example
+
+```ts
+import { getSingleton, closeSingleton } from "@suaveplan/db";
+import { SqliteAdapter } from "@suaveplan/db-sqlite";
+
+// Get or create the default "app" connection
+const db = await getSingleton("app", () => new SqliteAdapter({ filename: "./app.db" }));
+
+const rows = await db.query<{ id: number }>("SELECT id FROM users");
+
+// Clean up at process exit
+await closeSingleton("app");
+```
+
+## Usage: Advanced Example
+
+```ts
+import {
+  getSingleton,
+  closeAllSingletons,
+  hasSingleton,
+} from "@suaveplan/db";
+import type { DatabaseAdapter } from "@suaveplan/db";
+
+// Test-isolated registry — no cross-test bleed
+const testRegistry = new Map<string, DatabaseAdapter>();
+
+beforeEach(async () => {
+  await getSingleton(
+    "test-db",
+    () => new SqliteAdapter({ filename: ":memory:" }),
+    undefined,
+    undefined,
+    testRegistry
+  );
+});
+
+afterEach(async () => {
+  await closeAllSingletons(undefined, testRegistry);
+});
+
+it("has singleton after setup", () => {
+  expect(hasSingleton("test-db", testRegistry)).toBe(true);
+});
+```
+
+## API Reference
+
+### `getSingleton`
+
+```ts
+getSingleton(
+  name: string,
+  factory: () => DatabaseAdapter,
+  config?: Partial<DatabaseConfig>,
+  opts?: DbOperationOptions,
+  registry?: Map<string, DatabaseAdapter>
+): Promise<DatabaseAdapter>
+```
+
+Returns the cached adapter for `name`, or creates one via `factory`, validates `config`, connects it, and caches it. Throws `DatabaseError(DB.CONNECTION_FAILED)` if `connect` fails.
+
+### `closeSingleton`
+
+```ts
+closeSingleton(
+  name: string,
+  opts?: DbOperationOptions,
+  registry?: Map<string, DatabaseAdapter>
+): Promise<void>
+```
+
+Calls `disconnect` on the named adapter and removes it from the registry. No-op if `name` is not registered.
+
+### `hasSingleton`
+
+```ts
+hasSingleton(name: string, registry?: Map<string, DatabaseAdapter>): boolean
+```
+
+Returns `true` if an adapter is registered under `name`.
+
+### `closeAllSingletons`
+
+```ts
+closeAllSingletons(
+  opts?: DbOperationOptions,
+  registry?: Map<string, DatabaseAdapter>
+): Promise<void>
+```
+
+Clears the registry immediately, then disconnects all adapters concurrently. If one or more disconnects fail, an `AggregateError` is thrown after all attempts complete.
+
+## Implementation Notes
+
+The registry is cleared before `disconnect` is called in `closeAllSingletons`. This ensures that even if a `disconnect` rejects, the registry is empty and a subsequent `getSingleton` call will create a fresh adapter rather than returning a half-closed one. The AggregateError is thrown after all disconnect attempts so callers get complete failure information rather than a short-circuit on the first error.
+
+Config validation uses `DatabaseConfigSchema.parse` (not `.safeParse`) so invalid config throws a `ZodError` immediately — fail-fast at the boundary is preferable to a cryptic driver-level error.

packages/persistence/database/db/src/connection/singleton.test.ts

@@ -0,0 +1,295 @@
+import { describe, expect, it } from "@suaveplan/testing/runner";
+import type { DatabaseLike } from "@suaveplan/types";
+import type { DatabaseAdapter, DbOperationOptions } from "../adapter/index.js";
+import { DatabaseError } from "../errors/index.js";
+import type {
+    DatabaseConfig,
+    MigrationConfig,
+    MigrationResult,
+} from "../types/index.js";
+import {
+    closeAllSingletons,
+    closeSingleton,
+    getSingleton,
+    hasSingleton,
+} from "./singleton.js";
+
+// ── Helpers ──────────────────────────────────────────────────────────────────
+
+function makeRegistry(): Map<string, DatabaseAdapter> {
+    return new Map();
+}
+
+class MockAdapter implements DatabaseAdapter {
+    #connected = false;
+    connectCalls = 0;
+    disconnectCalls = 0;
+    shouldFailConnect = false;
+
+    get isConnected(): boolean {
+        return this.#connected;
+    }
+
+    async connect(
+        _c?: Partial<DatabaseConfig>,
+        opts?: DbOperationOptions
+    ): Promise<void> {
+        if (opts?.signal?.aborted) throw new Error("aborted");
+        if (this.shouldFailConnect) throw new Error("connection refused");
+        this.#connected = true;
+        this.connectCalls++;
+    }
+    async disconnect(opts?: DbOperationOptions): Promise<void> {
+        if (opts?.signal?.aborted) throw new Error("aborted");
+        this.#connected = false;
+        this.disconnectCalls++;
+    }
+    async close(): Promise<void> {
+        await this.disconnect();
+    }
+    async query<T>(): Promise<T[]> {
+        return [];
+    }
+    async execute(): Promise<{ rowsAffected: number }> {
+        return { rowsAffected: 0 };
+    }
+    async transaction<T>(fn: (tx: DatabaseLike) => Promise<T>): Promise<T> {
+        return fn(this);
+    }
+    async migrate(_c?: MigrationConfig): Promise<MigrationResult> {
+        return { applied: 0, migrations: [] };
+    }
+}
+
+// ── Tests ─────────────────────────────────────────────────────────────────────
+
+describe("getSingleton", () => {
+    it("creates and caches adapter on first call", {
+        timeout: 30000,
+    }, async () => {
+        const reg = makeRegistry();
+        const adapter = new MockAdapter();
+        const result = await getSingleton(
+            "db",
+            () => adapter,
+            undefined,
+            undefined,
+            reg
+        );
+        expect(result).toBe(adapter);
+        expect(adapter.connectCalls).toBe(1);
+        expect(reg.size).toBe(1);
+    });
+
+    it("returns same reference on second call without reconnecting", {
+        timeout: 30000,
+    }, async () => {
+        const reg = makeRegistry();
+        const adapter = new MockAdapter();
+        const r1 = await getSingleton(
+            "db",
+            () => adapter,
+            undefined,
+            undefined,
+            reg
+        );
+        const r2 = await getSingleton(
+            "db",
+            () => adapter,
+            undefined,
+            undefined,
+            reg
+        );
+        expect(r1).toBe(r2);
+        expect(adapter.connectCalls).toBe(1);
+    });
+
+    it("validates config via DatabaseConfigSchema", {
+        timeout: 30000,
+    }, async () => {
+        const reg = makeRegistry();
+        const adapter = new MockAdapter();
+        const result = await getSingleton(
+            "db",
+            () => adapter,
+            { filename: ":memory:", readonlyMode: false },
+            undefined,
+            reg
+        );
+        expect(result).toBe(adapter);
+    });
+
+    it("wraps connect failure as DatabaseError with CONNECTION_FAILED", {
+        timeout: 30000,
+    }, async () => {
+        const reg = makeRegistry();
+        const adapter = new MockAdapter();
+        adapter.shouldFailConnect = true;
+        await expect(
+            getSingleton("db", () => adapter, undefined, undefined, reg)
+        ).rejects.toThrow(DatabaseError);
+        await expect(
+            getSingleton("db", () => adapter, undefined, undefined, reg)
+        ).rejects.toMatchObject({ code: "DB.CONNECTION_FAILED" });
+    });
+
+    it("propagates AbortSignal to connect", {
+        timeout: 30000,
+    }, async () => {
+        const reg = makeRegistry();
+        const adapter = new MockAdapter();
+        const ac = new AbortController();
+        ac.abort();
+        await expect(
+            getSingleton(
+                "db",
+                () => adapter,
+                undefined,
+                { signal: ac.signal },
+                reg
+            )
+        ).rejects.toThrow();
+    });
+});
+
+describe("hasSingleton", () => {
+    it("returns false for empty registry", { timeout: 5000 }, () => {
+        expect(hasSingleton("db", makeRegistry())).toBe(false);
+    });
+
+    it("returns true after getSingleton", { timeout: 30000 }, async () => {
+        const reg = makeRegistry();
+        await getSingleton(
+            "db",
+            () => new MockAdapter(),
+            undefined,
+            undefined,
+            reg
+        );
+        expect(hasSingleton("db", reg)).toBe(true);
+    });
+
+    it("returns false after closeSingleton", {
+        timeout: 30000,
+    }, async () => {
+        const reg = makeRegistry();
+        await getSingleton(
+            "db",
+            () => new MockAdapter(),
+            undefined,
+            undefined,
+            reg
+        );
+        await closeSingleton("db", undefined, reg);
+        expect(hasSingleton("db", reg)).toBe(false);
+    });
+});
+
+describe("closeSingleton", () => {
+    it("disconnects and removes from registry", {
+        timeout: 30000,
+    }, async () => {
+        const reg = makeRegistry();
+        const adapter = new MockAdapter();
+        await getSingleton("db", () => adapter, undefined, undefined, reg);
+        await closeSingleton("db", undefined, reg);
+        expect(adapter.disconnectCalls).toBe(1);
+        expect(reg.has("db")).toBe(false);
+    });
+
+    it("is a no-op for unregistered name", {
+        timeout: 30000,
+    }, async () => {
+        const reg = makeRegistry();
+        await expect(
+            closeSingleton("nope", undefined, reg)
+        ).resolves.toBeUndefined();
+    });
+});
+
+describe("closeAllSingletons", () => {
+    it("disconnects all and clears registry", {
+        timeout: 30000,
+    }, async () => {
+        const reg = makeRegistry();
+        const a = new MockAdapter();
+        const b = new MockAdapter();
+        await getSingleton("a", () => a, undefined, undefined, reg);
+        await getSingleton("b", () => b, undefined, undefined, reg);
+        await closeAllSingletons(undefined, reg);
+        expect(a.disconnectCalls).toBe(1);
+        expect(b.disconnectCalls).toBe(1);
+        expect(reg.size).toBe(0);
+    });
+
+    it("clears registry even when one disconnect rejects", {
+        timeout: 30000,
+    }, async () => {
+        const reg = makeRegistry();
+        const good = new MockAdapter();
+        const bad = new MockAdapter();
+        bad.disconnect = async () => {
+            throw new Error("disconnect failed");
+        };
+
+        await getSingleton("good", () => good, undefined, undefined, reg);
+        await getSingleton("bad", () => bad, undefined, undefined, reg);
+
+        await expect(closeAllSingletons(undefined, reg)).rejects.toThrow(
+            AggregateError
+        );
+        expect(reg.size).toBe(0);
+        expect(good.disconnectCalls).toBe(1);
+    });
+});
+
+// ── Default-registry coverage ──────────────────────────────────────────────────
+// These tests use the module-level default registry (no explicit registry param)
+// in order to cover the `= defaultRegistry` default parameter branches.
+// Each test cleans up after itself to avoid cross-test bleed.
+
+describe("default registry (module-level)", () => {
+    const TEST_KEY = "__default_registry_coverage_test__";
+
+    it("getSingleton / hasSingleton / closeSingleton use default registry", {
+        timeout: 30000,
+    }, async () => {
+        const adapter = new MockAdapter();
+        // getSingleton — default registry branch
+        const result = await getSingleton(TEST_KEY, () => adapter);
+        expect(result).toBe(adapter);
+        // hasSingleton — default registry branch
+        expect(hasSingleton(TEST_KEY)).toBe(true);
+        // closeSingleton — default registry branch
+        await closeSingleton(TEST_KEY);
+        expect(hasSingleton(TEST_KEY)).toBe(false);
+    });
+
+    it("closeAllSingletons uses default registry", {
+        timeout: 30000,
+    }, async () => {
+        const adapter = new MockAdapter();
+        await getSingleton(TEST_KEY, () => adapter);
+        // closeAllSingletons — default registry branch
+        await closeAllSingletons();
+        expect(hasSingleton(TEST_KEY)).toBe(false);
+    });
+});
+
+describe("getSingleton non-Error connect failure", () => {
+    it("wraps non-Error thrown value in DatabaseError", {
+        timeout: 30000,
+    }, async () => {
+        const reg = makeRegistry();
+        const badAdapter = new MockAdapter();
+        badAdapter.connect = async () => {
+            throw "string failure";
+        };
+        await expect(
+            getSingleton("db", () => badAdapter, undefined, undefined, reg)
+        ).rejects.toMatchObject({
+            code: "DB.CONNECTION_FAILED",
+            message: expect.stringContaining("string failure"),
+        });
+    });
+});

packages/persistence/database/db/src/connection/singleton.ts

@@ -0,0 +1,89 @@
+import type { DatabaseAdapter, DbOperationOptions } from "../adapter/index.js";
+import { DatabaseError, DB_CODES } from "../errors/index.js";
+import { type DatabaseConfig, DatabaseConfigSchema } from "../types/index.js";
+
+const defaultRegistry = new Map<string, DatabaseAdapter>();
+
+/**
+ * Return an existing adapter for `name` from `registry`, or create one via
+ * `factory`, connect it, and cache it. Subsequent calls with the same name
+ * return the cached adapter without reconnecting.
+ */
+export async function getSingleton(
+    name: string,
+    factory: () => DatabaseAdapter,
+    config?: Partial<DatabaseConfig>,
+    opts?: DbOperationOptions,
+    registry: Map<string, DatabaseAdapter> = defaultRegistry
+): Promise<DatabaseAdapter> {
+    const existing = registry.get(name);
+    if (existing !== undefined) return existing;
+
+    const validConfig =
+        config !== undefined ? DatabaseConfigSchema.parse(config) : undefined;
+
+    const adapter = factory();
+    try {
+        await adapter.connect(validConfig, opts);
+    } catch (err) {
+        throw new DatabaseError(
+            DB_CODES.CONNECTION_FAILED,
+            `Failed to connect singleton '${name}': ${err instanceof Error ? err.message : String(err)}`,
+            { cause: err instanceof Error ? err : undefined }
+        );
+    }
+    registry.set(name, adapter);
+    return adapter;
+}
+
+/**
+ * Disconnect and remove the named adapter from `registry`.
+ * No-op if the name is not registered.
+ */
+export async function closeSingleton(
+    name: string,
+    opts?: DbOperationOptions,
+    registry: Map<string, DatabaseAdapter> = defaultRegistry
+): Promise<void> {
+    const adapter = registry.get(name);
+    if (adapter === undefined) return;
+    registry.delete(name);
+    await adapter.disconnect(opts);
+}
+
+/** Return `true` if a live adapter is registered under `name`. */
+export function hasSingleton(
+    name: string,
+    registry: Map<string, DatabaseAdapter> = defaultRegistry
+): boolean {
+    return registry.has(name);
+}
+
+/**
+ * Disconnect and remove all adapters in `registry`. Disconnection errors are
+ * collected; after all adapters are attempted the registry is cleared and any
+ * errors are re-thrown as an `AggregateError`.
+ */
+export async function closeAllSingletons(
+    opts?: DbOperationOptions,
+    registry: Map<string, DatabaseAdapter> = defaultRegistry
+): Promise<void> {
+    const entries = [...registry.entries()];
+    registry.clear();
+    const errors: unknown[] = [];
+    await Promise.all(
+        entries.map(async ([, adapter]) => {
+            try {
+                await adapter.disconnect(opts);
+            } catch (err) {
+                errors.push(err);
+            }
+        })
+    );
+    if (errors.length > 0) {
+        throw new AggregateError(
+            errors,
+            "One or more singletons failed to disconnect"
+        );
+    }
+}

packages/persistence/database/db/src/errors/database-error.md

@@ -0,0 +1,107 @@
+# DatabaseError / MigrationError
+
+<!-- begin:auto-docs -->
+_(no submodules)_
+<!-- end:auto-docs -->
+## Purpose
+
+`DatabaseError` is the structured error class for all database failures in `@suaveplan/db`. It extends `SuaveplanError` from `@suaveplan/error`, ensuring every database error carries a stable, machine-readable `DB.*` code alongside a human-readable message and optional cause chain. `MigrationError` is a specialisation that records which named migration failed.
+
+Using `SuaveplanError` as the base means consumers can perform type-safe `instanceof` checks, extract OTel-compatible codes from `error.code`, and inspect cause chains consistently across the entire Suaveplan project.
+
+## Features
+
+- Extends `SuaveplanError<DbCode>` — participates in the project-wide error hierarchy
+- Stable `DB.*` codes registered via `defineCodes` — never change between versions
+- `cause` threading — wraps lower-level driver errors without losing the original stack
+- `MigrationError.migration` field — names the exact migration file that failed
+- `name` property set to the concrete class name for easy identification in logs
+
+## Usage: Basic Example
+
+```ts
+import { DatabaseError, MigrationError, DB_CODES } from "@suaveplan/db";
+
+// Throw a connection failure
+throw new DatabaseError(
+  DB_CODES.CONNECTION_FAILED,
+  "Could not reach postgres://localhost:5432/app"
+);
+
+// Throw a migration failure
+throw new MigrationError("003_add_index", "duplicate column name: email");
+```
+
+## Usage: Advanced Example
+
+```ts
+import { DatabaseError, DB_CODES } from "@suaveplan/db";
+import { SuaveplanError } from "@suaveplan/error";
+
+async function runQuery(sql: string): Promise<unknown[]> {
+  try {
+    return await driver.query(sql);
+  } catch (cause) {
+    throw new DatabaseError(
+      DB_CODES.QUERY_FAILED,
+      `Query failed: ${cause instanceof Error ? cause.message : String(cause)}`,
+      { cause: cause instanceof Error ? cause : undefined }
+    );
+  }
+}
+
+// Narrowing in catch blocks
+try {
+  await runQuery("SELECT * FROM users");
+} catch (err) {
+  if (err instanceof DatabaseError) {
+    console.error(err.code, err.message); // "DB.QUERY_FAILED Query failed: ..."
+  }
+}
+```
+
+## API Reference
+
+### `DatabaseError`
+
+```ts
+class DatabaseError extends SuaveplanError<DbCode> {
+  constructor(code: DbCode, message: string, options?: SuaveplanErrorOptions): void
+}
+```
+
+- **`code`** (`DbCode`) — one of `DB.CONNECTION_FAILED`, `DB.NOT_CONNECTED`, `DB.QUERY_FAILED`, `DB.TRANSACTION_FAILED`, `DB.MIGRATION_FAILED`
+- **`message`** (`string`) — human-readable description
+- **`options.cause`** (`Error | undefined`) — lower-level error that triggered this one
+
+### `MigrationError`
+
+```ts
+class MigrationError extends DatabaseError {
+  readonly migration: string;
+  constructor(migration: string, detail: string, options?: SuaveplanErrorOptions): void
+}
+```
+
+- **`migration`** (`string`) — the migration name (e.g. `"001_init"`)
+- **`detail`** (`string`) — description of what went wrong
+- Message format: `"Migration '<migration>' failed: <detail>"`
+- Code is always `DB.MIGRATION_FAILED`
+
+### `DB_CODES`
+
+```ts
+const DB_CODES: {
+  readonly CONNECTION_FAILED: "DB.CONNECTION_FAILED";
+  readonly NOT_CONNECTED:     "DB.NOT_CONNECTED";
+  readonly QUERY_FAILED:      "DB.QUERY_FAILED";
+  readonly TRANSACTION_FAILED:"DB.TRANSACTION_FAILED";
+  readonly MIGRATION_FAILED:  "DB.MIGRATION_FAILED";
+}
+```
+
+## Implementation Notes
+
+Both classes pass the `message` string directly to `SuaveplanError` as a literal message key rather than an i18n key, so no message-resolver configuration is required. This keeps `@suaveplan/db` dependency-free of any i18n infrastructure. If localisation is needed in a future version, the message key can be replaced with an i18n key and the `context` option used for interpolation.
+
+`MigrationError` explicitly sets `this.name = "MigrationError"` in the constructor because `SuaveplanError` sets `this.name = new.target.name` — the explicit assignment in the subclass constructor ensures the name is accurate when the class is transpiled or minified.

packages/persistence/database/db/src/errors/database-error.test.ts

@@ -0,0 +1,84 @@
+import { SuaveplanError } from "@suaveplan/error";
+import { describe, expect, it } from "@suaveplan/testing/runner";
+import { DatabaseError, MigrationError } from "./database-error.js";
+import { DB_CODES } from "./db-codes.js";
+
+describe("DatabaseError", () => {
+    it("is instanceof SuaveplanError", { timeout: 5000 }, () => {
+        const err = new DatabaseError(DB_CODES.QUERY_FAILED, "query failed");
+        expect(err).toBeInstanceOf(SuaveplanError);
+        expect(err).toBeInstanceOf(DatabaseError);
+    });
+
+    it("has correct stable code", { timeout: 5000 }, () => {
+        const err = new DatabaseError(DB_CODES.NOT_CONNECTED, "not connected");
+        expect(err.code).toBe("DB.NOT_CONNECTED");
+    });
+
+    it("has correct name", { timeout: 5000 }, () => {
+        const err = new DatabaseError(DB_CODES.CONNECTION_FAILED, "failed");
+        expect(err.name).toBe("DatabaseError");
+    });
+
+    it("preserves cause in chain", { timeout: 5000 }, () => {
+        const cause = new Error("original");
+        const err = new DatabaseError(DB_CODES.QUERY_FAILED, "wrapped", {
+            cause,
+        });
+        expect(err.cause).toBe(cause);
+    });
+
+    it("message is passed through directly", { timeout: 5000 }, () => {
+        const err = new DatabaseError(DB_CODES.TRANSACTION_FAILED, "tx failed");
+        expect(err.message).toBe("tx failed");
+    });
+
+    it("all DB codes produce valid code strings", { timeout: 5000 }, () => {
+        expect(DB_CODES.CONNECTION_FAILED).toBe("DB.CONNECTION_FAILED");
+        expect(DB_CODES.NOT_CONNECTED).toBe("DB.NOT_CONNECTED");
+        expect(DB_CODES.QUERY_FAILED).toBe("DB.QUERY_FAILED");
+        expect(DB_CODES.TRANSACTION_FAILED).toBe("DB.TRANSACTION_FAILED");
+        expect(DB_CODES.MIGRATION_FAILED).toBe("DB.MIGRATION_FAILED");
+    });
+});
+
+describe("MigrationError", () => {
+    it("is instanceof DatabaseError and SuaveplanError", {
+        timeout: 5000,
+    }, () => {
+        const err = new MigrationError("001_init", "syntax error");
+        expect(err).toBeInstanceOf(MigrationError);
+        expect(err).toBeInstanceOf(DatabaseError);
+        expect(err).toBeInstanceOf(SuaveplanError);
+    });
+
+    it("always uses DB.MIGRATION_FAILED code", { timeout: 5000 }, () => {
+        const err = new MigrationError("001_init", "bad sql");
+        expect(err.code).toBe("DB.MIGRATION_FAILED");
+    });
+
+    it("has correct name", { timeout: 5000 }, () => {
+        const err = new MigrationError("001_init", "detail");
+        expect(err.name).toBe("MigrationError");
+    });
+
+    it("formats message as Migration '<name>' failed: <detail>", {
+        timeout: 5000,
+    }, () => {
+        const err = new MigrationError("001_init", "column does not exist");
+        expect(err.message).toBe(
+            "Migration '001_init' failed: column does not exist"
+        );
+    });
+
+    it("exposes migration field", { timeout: 5000 }, () => {
+        const err = new MigrationError("002_add_users", "detail");
+        expect(err.migration).toBe("002_add_users");
+    });
+
+    it("preserves cause", { timeout: 5000 }, () => {
+        const cause = new Error("underlying");
+        const err = new MigrationError("001_init", "failed", { cause });
+        expect(err.cause).toBe(cause);
+    });
+});

packages/persistence/database/db/src/errors/database-error.ts

@@ -0,0 +1,31 @@
+import { SuaveplanError, type SuaveplanErrorOptions } from "@suaveplan/error";
+import { DB_CODES, type DbCode } from "./db-codes.js";
+
+export class DatabaseError extends SuaveplanError<DbCode> {
+    // biome-ignore lint/complexity/noUselessConstructor: SuaveplanError constructor is protected; this exposes a public entry point
+    public constructor(
+        code: DbCode,
+        message: string,
+        options?: SuaveplanErrorOptions
+    ) {
+        super(code, message, options);
+    }
+}
+
+export class MigrationError extends DatabaseError {
+    public readonly migration: string;
+
+    public constructor(
+        migration: string,
+        detail: string,
+        options?: SuaveplanErrorOptions
+    ) {
+        super(
+            DB_CODES.MIGRATION_FAILED,
+            `Migration '${migration}' failed: ${detail}`,
+            options
+        );
+        this.migration = migration;
+        this.name = "MigrationError";
+    }
+}

packages/persistence/database/db/src/errors/db-codes.ts

@@ -0,0 +1,11 @@
+import { defineCodes } from "@suaveplan/error";
+
+export const DB_CODES = defineCodes("DB", [
+    "CONNECTION_FAILED",
+    "NOT_CONNECTED",
+    "QUERY_FAILED",
+    "TRANSACTION_FAILED",
+    "MIGRATION_FAILED",
+] as const);
+
+export type DbCode = (typeof DB_CODES)[keyof typeof DB_CODES];

packages/persistence/database/db/src/errors/index.ts

@@ -0,0 +1,2 @@
+export { DatabaseError, MigrationError } from "./database-error.js";
+export { DB_CODES, type DbCode } from "./db-codes.js";

packages/persistence/database/db/src/index.ts

@@ -0,0 +1,30 @@
+export type { DatabaseAdapter, DbOperationOptions } from "./adapter/index.js";
+export {
+    closeAllSingletons,
+    closeSingleton,
+    getSingleton,
+    hasSingleton,
+} from "./connection/index.js";
+export {
+    DatabaseError,
+    DB_CODES,
+    type DbCode,
+    MigrationError,
+} from "./errors/index.js";
+export type { MigrationRunner } from "./migration/migration-runner.js";
+export {
+    recordConnectionDelta,
+    recordMigration,
+    recordQueryDuration,
+    recordTransaction,
+    resetInstruments,
+    withDbSpan,
+} from "./telemetry/index.js";
+export {
+    type DatabaseConfig,
+    DatabaseConfigSchema,
+    type MigrationConfig,
+    MigrationConfigSchema,
+    type MigrationResult,
+    type MigrationStatus,
+} from "./types/index.js";

packages/persistence/database/db/src/migration/index.ts

@@ -0,0 +1,8 @@
+export { MigrationError } from "../errors/index.js";
+export type {
+    MigrationConfig,
+    MigrationResult,
+    MigrationStatus,
+} from "../types/index.js";
+export { MigrationConfigSchema } from "../types/index.js";
+export type { MigrationRunner } from "./migration-runner.js";

packages/persistence/database/db/src/migration/migration-runner.md

@@ -0,0 +1,101 @@
+# MigrationRunner
+
+<!-- begin:auto-docs -->
+_(no submodules)_
+<!-- end:auto-docs -->
+## Purpose
+
+`MigrationRunner` is the interface that `DatabaseAdapter.migrate` delegates to in concrete adapter implementations. Separating the migration contract from the adapter contract lets adapters swap migration strategies without changing their top-level API — for example, a SQLite adapter might use Drizzle's migration runner while a SurrealDB adapter uses a custom `.surql` file runner, yet both expose the same `DatabaseAdapter.migrate` signature to callers.
+
+The three-method design mirrors the principle of least surprise: `pendingMigrations` is a read-only query (safe to call for status checks without making changes), `applyMigration` is the atomic unit of work, and `run` is the high-level orchestrator that wires them together.
+
+## Features
+
+- `pendingMigrations` — read-only: lists unapplied migrations without side effects
+- `applyMigration` — atomic unit: applies a single named migration by SQL string
+- `run` — orchestrator: discovers, orders, and applies all pending migrations
+- `MigrationError` — thrown with the exact migration name on failure
+- `AbortSignal` on both `applyMigration` and `run` via `DbOperationOptions`
+- Accepts optional `MigrationConfig` to override folder/table defaults
+
+## Usage: Basic Example
+
+```ts
+import type { MigrationRunner } from "@suaveplan/db";
+import { MigrationError } from "@suaveplan/db";
+
+class FileMigrationRunner implements MigrationRunner {
+  async pendingMigrations(config?) {
+    const applied = await this.loadApplied(config);
+    const all = await this.discoverFiles(config);
+    return all
+      .filter(m => !applied.has(m.name))
+      .map(m => ({ name: m.name, applied: false }));
+  }
+
+  async applyMigration(name, sql, opts?) {
+    try {
+      await this.db.execute(sql, [], opts);
+      await this.recordApplied(name);
+    } catch (err) {
+      throw new MigrationError(name, err instanceof Error ? err.message : String(err), { cause: err });
+    }
+  }
+
+  async run(config?, opts?) {
+    const pending = await this.pendingMigrations(config);
+    const names: string[] = [];
+    for (const { name } of pending) {
+      const sql = await this.loadSql(name, config);
+      await this.applyMigration(name, sql, opts);
+      names.push(name);
+    }
+    return { applied: names.length, migrations: names };
+  }
+}
+```
+
+## Usage: Advanced Example
+
+```ts
+import type { MigrationRunner } from "@suaveplan/db";
+import { MigrationError, withDbSpan } from "@suaveplan/db";
+
+// Wrapping run with OTel tracing
+async function runMigrations(runner: MigrationRunner): Promise<void> {
+  const result = await withDbSpan("db.migrate", () =>
+    runner.run({ migrationsFolder: "./db/migrations" })
+  );
+  console.log(`Applied ${result.applied} migration(s):`, result.migrations);
+}
+
+// Status check without applying
+async function checkMigrationStatus(runner: MigrationRunner): Promise<void> {
+  const pending = await runner.pendingMigrations();
+  if (pending.length > 0) {
+    console.warn(`${pending.length} unapplied migrations:`, pending.map(m => m.name));
+  }
+}
+```
+
+## API Reference
+
+### `MigrationRunner`
+
+```ts
+interface MigrationRunner {
+  pendingMigrations(config?: MigrationConfig): Promise<MigrationStatus[]>;
+  applyMigration(name: string, sql: string, opts?: DbOperationOptions): Promise<void>;
+  run(config?: MigrationConfig, opts?: DbOperationOptions): Promise<MigrationResult>;
+}
+```
+
+- **`pendingMigrations`** — returns only unapplied migrations; never mutates state
+- **`applyMigration`** — applies one migration; throws `MigrationError` on failure with the migration's name in `error.migration`
+- **`run`** — discovers pending migrations via `pendingMigrations` and applies them in order via `applyMigration`; returns aggregate `MigrationResult`
+
+## Implementation Notes
+
+`MigrationRunner` is intentionally an interface rather than an abstract class. This keeps the dependency graph clean — the runner itself has no implementation, so it imposes no runtime cost. Concrete adapters in `@suaveplan/db-sqlite` and future packages supply the implementation.
+
+The `AbortSignal` is only threaded through `applyMigration` and `run` — `pendingMigrations` is a read-only operation and is not expected to take long enough to warrant cancellation in typical use cases. Implementors may add signal support to `pendingMigrations` as a non-breaking extension.

packages/persistence/database/db/src/migration/migration-runner.test.ts

@@ -0,0 +1,113 @@
+import { describe, expect, it } from "@suaveplan/testing/runner";
+import type { DbOperationOptions } from "../adapter/index.js";
+import { MigrationError } from "../errors/index.js";
+import type {
+    MigrationConfig,
+    MigrationResult,
+    MigrationStatus,
+} from "../types/index.js";
+import type { MigrationRunner } from "./migration-runner.js";
+
+// Minimal stub implementation for contract verification
+class StubMigrationRunner implements MigrationRunner {
+    private applied: Set<string> = new Set();
+    private migrationMap = new Map<string, string>();
+    shouldFail: string | undefined;
+
+    register(name: string, sql: string): void {
+        this.migrationMap.set(name, sql);
+    }
+
+    async pendingMigrations(
+        _config?: MigrationConfig
+    ): Promise<MigrationStatus[]> {
+        return [...this.migrationMap.keys()]
+            .filter((name) => !this.applied.has(name))
+            .map((name) => ({ name, applied: false }));
+    }
+
+    async applyMigration(
+        name: string,
+        _sql: string,
+        opts?: DbOperationOptions
+    ): Promise<void> {
+        if (opts?.signal?.aborted) throw new Error("aborted");
+        if (this.shouldFail === name) {
+            throw new MigrationError(name, "syntax error");
+        }
+        this.applied.add(name);
+    }
+
+    async run(
+        config?: MigrationConfig,
+        opts?: DbOperationOptions
+    ): Promise<MigrationResult> {
+        const pending = await this.pendingMigrations(config);
+        const names: string[] = [];
+        for (const { name } of pending) {
+            const sql = this.migrationMap.get(name) ?? "";
+            await this.applyMigration(name, sql, opts);
+            names.push(name);
+        }
+        return { applied: names.length, migrations: names };
+    }
+}
+
+describe("MigrationRunner (StubMigrationRunner)", () => {
+    it("run applies all pending migrations", {
+        timeout: 30000,
+    }, async () => {
+        const runner = new StubMigrationRunner();
+        runner.register("001_init", "CREATE TABLE t (id INT)");
+        runner.register("002_add_col", "ALTER TABLE t ADD col TEXT");
+
+        const result = await runner.run();
+        expect(result.applied).toBe(2);
+        expect(result.migrations).toEqual(["001_init", "002_add_col"]);
+    });
+
+    it("pendingMigrations excludes already-applied", {
+        timeout: 30000,
+    }, async () => {
+        const runner = new StubMigrationRunner();
+        runner.register("001_init", "CREATE TABLE t (id INT)");
+        await runner.run();
+        const pending = await runner.pendingMigrations();
+        expect(pending).toHaveLength(0);
+    });
+
+    it("run returns empty result when nothing pending", {
+        timeout: 30000,
+    }, async () => {
+        const runner = new StubMigrationRunner();
+        const result = await runner.run();
+        expect(result).toEqual({ applied: 0, migrations: [] });
+    });
+
+    it("applyMigration throws MigrationError with correct migration field", {
+        timeout: 30000,
+    }, async () => {
+        const runner = new StubMigrationRunner();
+        runner.shouldFail = "001_init";
+        runner.register("001_init", "bad sql");
+        await expect(
+            runner.applyMigration("001_init", "bad sql")
+        ).rejects.toThrow(MigrationError);
+        await expect(
+            runner.applyMigration("001_init", "bad sql")
+        ).rejects.toMatchObject({ migration: "001_init" });
+    });
+
+    it("AbortSignal halts mid-run", { timeout: 30000 }, async () => {
+        const runner = new StubMigrationRunner();
+        runner.register("001_init", "CREATE TABLE t (id INT)");
+        runner.register("002_add_col", "ALTER TABLE t ADD col TEXT");
+
+        const ac = new AbortController();
+        // Abort before run starts
+        ac.abort();
+        await expect(
+            runner.run(undefined, { signal: ac.signal })
+        ).rejects.toThrow();
+    });
+});

packages/persistence/database/db/src/migration/migration-runner.ts

@@ -0,0 +1,40 @@
+import type { DbOperationOptions } from "../adapter/index.js";
+import type {
+    MigrationConfig,
+    MigrationResult,
+    MigrationStatus,
+} from "../types/index.js";
+
+/**
+ * Contract for a migration runner.
+ *
+ * Concrete adapters delegate `DatabaseAdapter.migrate()` to an implementation
+ * of this interface. Keeping the runner separate lets adapters swap migration
+ * strategies without changing the top-level adapter API.
+ */
+export interface MigrationRunner {
+    /**
+     * Return all migrations that have not yet been applied according to the
+     * adapter's migration-tracking store.
+     */
+    pendingMigrations(config?: MigrationConfig): Promise<MigrationStatus[]>;
+
+    /**
+     * Apply a single named migration by executing `sql` inside the adapter and
+     * recording its completion in the tracking store.
+     */
+    applyMigration(
+        name: string,
+        sql: string,
+        opts?: DbOperationOptions
+    ): Promise<void>;
+
+    /**
+     * Discover and apply all pending migrations in version order. Returns a
+     * summary of what was applied.
+     */
+    run(
+        config?: MigrationConfig,
+        opts?: DbOperationOptions
+    ): Promise<MigrationResult>;
+}

packages/persistence/database/db/src/telemetry/index.ts

@@ -0,0 +1,8 @@
+export {
+    recordConnectionDelta,
+    recordMigration,
+    recordQueryDuration,
+    recordTransaction,
+    resetInstruments,
+} from "./instruments.js";
+export { withDbSpan } from "./trace.js";

packages/persistence/database/db/src/telemetry/instruments.md

@@ -0,0 +1,97 @@
+# OTel Instruments
+
+## Purpose
+
+`instruments.ts` provides lazily-initialised OpenTelemetry metric instruments for `@suaveplan/db`. Rather than creating meters at module load time (which would execute OTel SDK code before any SDK is registered and could silently fail), instruments are created on first use via a module-level singleton guard. This ensures the package works correctly both when an OTel SDK exporter is configured and when it is not — in the latter case, the OTel no-op provider handles all calls without errors.
+
+Four instruments cover the core observability surface: query/execute latency, connection lifecycle, transaction outcomes, and migration counts.
+
+## Features
+
+- Lazy initialisation — OTel meter created on first call, not at module load
+- `resetInstruments()` — clears the singleton for test isolation
+- `recordQueryDuration(ms, operation)` — histogram labelled by `db.operation`
+- `recordConnectionDelta(±1, dbName)` — UpDownCounter labelled by `db.name`
+- `recordTransaction(outcome)` — counter labelled by `db.outcome`
+- `recordMigration(name)` — counter labelled by `db.migration.name`
+- Works with no-op OTel provider — safe when no SDK is configured
+
+## Usage: Basic Example
+
+```ts
+import {
+  recordQueryDuration,
+  recordConnectionDelta,
+} from "@suaveplan/db/telemetry/instruments";
+
+// In a concrete adapter's connect():
+recordConnectionDelta(1, "main");
+
+// In a concrete adapter's query():
+const start = performance.now();
+const rows = await driver.query(sql);
+recordQueryDuration(performance.now() - start, "query");
+```
+
+## Usage: Advanced Example
+
+```ts
+import {
+  recordTransaction,
+  recordMigration,
+  resetInstruments,
+} from "@suaveplan/db/telemetry/instruments";
+
+// In a concrete adapter's transaction():
+let outcome: "committed" | "rolled_back" = "rolled_back";
+try {
+  await fn(tx);
+  outcome = "committed";
+} finally {
+  recordTransaction(outcome);
+}
+
+// In a migration runner after each applied migration:
+recordMigration("003_add_index");
+
+// In tests — reset between test runs to avoid state leak:
+beforeEach(() => resetInstruments());
+```
+
+## API Reference
+
+### `recordQueryDuration(durationMs, operation)`
+
+Records a query or execute duration.
+
+- `durationMs` — elapsed time in milliseconds
+- `operation` — `"query"` or `"execute"`
+
+### `recordConnectionDelta(delta, dbName)`
+
+Adjusts the active connection count.
+
+- `delta` — `1` on connect, `-1` on disconnect
+- `dbName` — logical name of the database (used as the `db.name` attribute)
+
+### `recordTransaction(outcome)`
+
+Increments the transaction counter.
+
+- `outcome` — `"committed"` or `"rolled_back"`
+
+### `recordMigration(migrationName)`
+
+Increments the migration counter.
+
+- `migrationName` — the name of the applied migration file
+
+### `resetInstruments()`
+
+Clears the cached instruments singleton. Useful in unit tests to avoid state from a prior test bleeding into subsequent ones.
+
+## Implementation Notes
+
+The instruments singleton guard uses an `undefined` check rather than a lazy initialiser class so there is no closure overhead — the check is a single `!== undefined` comparison per call. The `metrics.getMeter("@suaveplan/db")` call is safe under the OTel no-op provider because it returns a no-op meter whose `createHistogram`, `createUpDownCounter`, and `createCounter` methods all return no-op instruments that silently discard all data.
+
+`recordQueryDuration` uses a histogram (not a counter) so downstream dashboards can compute percentiles — P50/P95/P99 query latency is far more useful than a total call count for diagnosing slow queries.

packages/persistence/database/db/src/telemetry/instruments.test.ts

@@ -0,0 +1,45 @@
+import { beforeEach, describe, expect, it } from "@suaveplan/testing/runner";
+import {
+    recordConnectionDelta,
+    recordMigration,
+    recordQueryDuration,
+    recordTransaction,
+    resetInstruments,
+} from "./instruments.js";
+
+describe("OTel instruments (no-op provider)", () => {
+    beforeEach(() => {
+        resetInstruments();
+    });
+
+    it("recordQueryDuration does not throw with no SDK registered", {
+        timeout: 5000,
+    }, () => {
+        expect(() => recordQueryDuration(42, "query")).not.toThrow();
+        expect(() => recordQueryDuration(10, "execute")).not.toThrow();
+    });
+
+    it("recordConnectionDelta does not throw", { timeout: 5000 }, () => {
+        expect(() => recordConnectionDelta(1, "main")).not.toThrow();
+        expect(() => recordConnectionDelta(-1, "main")).not.toThrow();
+    });
+
+    it("recordTransaction does not throw for both outcomes", {
+        timeout: 5000,
+    }, () => {
+        expect(() => recordTransaction("committed")).not.toThrow();
+        expect(() => recordTransaction("rolled_back")).not.toThrow();
+    });
+
+    it("recordMigration does not throw", { timeout: 5000 }, () => {
+        expect(() => recordMigration("001_init")).not.toThrow();
+    });
+
+    it("instruments are lazily initialised (no top-level getMeter)", {
+        timeout: 5000,
+    }, () => {
+        // Calling after resetInstruments re-initialises without error
+        resetInstruments();
+        expect(() => recordQueryDuration(1, "query")).not.toThrow();
+    });
+});

packages/persistence/database/db/src/telemetry/instruments.ts

@@ -0,0 +1,60 @@
+import type { Counter, Histogram, UpDownCounter } from "@opentelemetry/api";
+import { metrics } from "@opentelemetry/api";
+
+interface DbInstruments {
+    queryDuration: Histogram;
+    connectionCount: UpDownCounter;
+    transactionCount: Counter;
+    migrationCount: Counter;
+}
+
+let instruments: DbInstruments | undefined;
+
+function getInstruments(): DbInstruments {
+    if (instruments !== undefined) return instruments;
+    const meter = metrics.getMeter("@suaveplan/db");
+    instruments = {
+        queryDuration: meter.createHistogram("db.query.duration_ms", {
+            description: "Database query/execute duration in milliseconds",
+            unit: "ms",
+        }),
+        connectionCount: meter.createUpDownCounter("db.connection.count", {
+            description: "Number of active database connections",
+        }),
+        transactionCount: meter.createCounter("db.transaction.count", {
+            description: "Total database transactions by outcome",
+        }),
+        migrationCount: meter.createCounter("db.migration.count", {
+            description: "Total migrations applied",
+        }),
+    };
+    return instruments;
+}
+
+export function recordQueryDuration(
+    durationMs: number,
+    operation: "query" | "execute"
+): void {
+    getInstruments().queryDuration.record(durationMs, {
+        "db.operation": operation,
+    });
+}
+
+export function recordConnectionDelta(delta: 1 | -1, dbName: string): void {
+    getInstruments().connectionCount.add(delta, { "db.name": dbName });
+}
+
+export function recordTransaction(outcome: "committed" | "rolled_back"): void {
+    getInstruments().transactionCount.add(1, { "db.outcome": outcome });
+}
+
+export function recordMigration(migrationName: string): void {
+    getInstruments().migrationCount.add(1, {
+        "db.migration.name": migrationName,
+    });
+}
+
+/** Reset the cached instruments (for use in tests). */
+export function resetInstruments(): void {
+    instruments = undefined;
+}

packages/persistence/database/db/src/telemetry/trace.md

@@ -0,0 +1,76 @@
+# withDbSpan
+
+## Purpose
+
+`withDbSpan` is a thin OTel tracing helper that wraps any async database operation in a named span. It handles the boilerplate of starting a span, setting its status on success or error, recording exceptions, and always ending the span — so concrete adapters and migration runners can add tracing with a single wrapper call rather than repeating the span lifecycle pattern in every method.
+
+Like the instruments module, `withDbSpan` relies on the OTel no-op tracer when no SDK is configured, so it is safe to call in any environment including tests with no OTel setup.
+
+## Features
+
+- Creates a named span via `trace.getTracer("@suaveplan/db")`
+- Sets `SpanStatusCode.OK` on successful completion
+- Sets `SpanStatusCode.ERROR` and records the exception on throw
+- Always ends the span (via `finally`) — no span leaks
+- Accepts optional `Attributes` for span metadata (e.g. `db.name`, `db.operation`)
+- Works with the OTel no-op provider — zero overhead when no exporter is registered
+
+## Usage: Basic Example
+
+```ts
+import { withDbSpan } from "@suaveplan/db/telemetry/trace";
+
+const rows = await withDbSpan("db.query", async () => {
+  return driver.query("SELECT * FROM users");
+});
+```
+
+## Usage: Advanced Example
+
+```ts
+import { withDbSpan } from "@suaveplan/db/telemetry/trace";
+
+// With span attributes for richer trace data
+const result = await withDbSpan(
+  "db.execute",
+  async () => driver.execute("DELETE FROM sessions WHERE expires_at < ?", [Date.now()]),
+  {
+    "db.name": "app",
+    "db.operation": "execute",
+    "db.statement": "DELETE FROM sessions",
+  }
+);
+
+// Wrapping a full transaction
+const transferResult = await withDbSpan("db.transaction.transfer", async () => {
+  return adapter.transaction(async (tx) => {
+    await tx.execute("UPDATE accounts SET balance = balance - ? WHERE id = ?", [100, "sender"]);
+    await tx.execute("UPDATE accounts SET balance = balance + ? WHERE id = ?", [100, "receiver"]);
+    return { ok: true };
+  });
+}, { "transfer.amount": 100 });
+```
+
+## API Reference
+
+### `withDbSpan<T>`
+
+```ts
+withDbSpan<T>(
+  name: string,
+  fn: () => Promise<T>,
+  attrs?: Attributes
+): Promise<T>
+```
+
+- **`name`** — OTel span name (e.g. `"db.query"`, `"db.migrate"`)
+- **`fn`** — async function to execute inside the span
+- **`attrs`** — optional `Attributes` map attached to the span at creation time
+- **Returns** — the resolved value of `fn()`
+- **Throws** — re-throws whatever `fn()` throws after recording the exception on the span
+
+## Implementation Notes
+
+`withDbSpan` uses the module-level `tracer` constant (created once at import time via `trace.getTracer("@suaveplan/db")`) rather than calling `getTracer` on every invocation. The OTel spec guarantees that `getTracer` with the same name returns the same tracer instance, so this is a safe optimisation.
+
+Non-Error thrown values (e.g. strings, numbers) are wrapped in `new Error(String(err))` before being passed to `span.recordException`. This satisfies the OTel SDK's type requirement for `recordException` while still re-throwing the original value, so callers that catch strings continue to work as before.

packages/persistence/database/db/src/telemetry/trace.test.ts

@@ -0,0 +1,41 @@
+import { describe, expect, it } from "@suaveplan/testing/runner";
+import { withDbSpan } from "./trace.js";
+
+describe("withDbSpan", () => {
+    it("returns resolved value on success", { timeout: 5000 }, async () => {
+        const result = await withDbSpan("test.op", async () => 42);
+        expect(result).toBe(42);
+    });
+
+    it("re-throws error from fn", { timeout: 5000 }, async () => {
+        await expect(
+            withDbSpan("test.op", async () => {
+                throw new Error("boom");
+            })
+        ).rejects.toThrow("boom");
+    });
+
+    it("works with attributes", { timeout: 5000 }, async () => {
+        const result = await withDbSpan("test.op", async () => "ok", {
+            "db.name": "main",
+        });
+        expect(result).toBe("ok");
+    });
+
+    it("works with no-op OTel provider (no SDK registered)", {
+        timeout: 5000,
+    }, async () => {
+        // No SDK registered in test environment — must not throw
+        await expect(withDbSpan("db.query", async () => [])).resolves.toEqual(
+            []
+        );
+    });
+
+    it("re-throws non-Error thrown values", { timeout: 5000 }, async () => {
+        await expect(
+            withDbSpan("test.op", async () => {
+                throw "string error";
+            })
+        ).rejects.toBe("string error");
+    });
+});

packages/persistence/database/db/src/telemetry/trace.ts

@@ -0,0 +1,34 @@
+import { type Attributes, SpanStatusCode, trace } from "@opentelemetry/api";
+
+const tracer = trace.getTracer("@suaveplan/db");
+
+/**
+ * Execute `fn` inside a named OTel span. Sets span status to `ERROR` and
+ * records the exception if `fn` throws, then always ends the span.
+ */
+export async function withDbSpan<T>(
+    name: string,
+    fn: () => Promise<T>,
+    attrs?: Attributes
+): Promise<T> {
+    const span = tracer.startSpan(
+        name,
+        attrs !== undefined ? { attributes: attrs } : undefined
+    );
+    try {
+        const result = await fn();
+        span.setStatus({ code: SpanStatusCode.OK });
+        return result;
+    } catch (err) {
+        span.setStatus({
+            code: SpanStatusCode.ERROR,
+            message: err instanceof Error ? err.message : String(err),
+        });
+        span.recordException(
+            err instanceof Error ? err : new Error(String(err))
+        );
+        throw err;
+    } finally {
+        span.end();
+    }
+}

packages/persistence/database/db/src/types/database-config.md

@@ -0,0 +1,117 @@
+# DatabaseConfig / MigrationConfig
+
+<!-- begin:auto-docs -->
+_(no submodules)_
+<!-- end:auto-docs -->
+## Purpose
+
+`DatabaseConfig` and `MigrationConfig` are the two primary configuration shapes for `@suaveplan/db`. They define the options accepted by `DatabaseAdapter.connect` and `DatabaseAdapter.migrate` respectively, and are validated at runtime via their companion Zod schemas. Centralising config shapes here ensures every concrete adapter (SQLite, Postgres, SurrealDB) receives the same validated input.
+
+By deriving the TypeScript types from Zod schemas (`z.infer<typeof ...>`), the types and runtime validation are always in sync — adding a new field in one place adds it to both automatically.
+
+## Features
+
+- `DatabaseConfig` — connection settings: optional file path, network URL, and read-only mode flag
+- `MigrationConfig` — migration settings: migrations folder path and tracking table name, both with sensible defaults
+- `MigrationStatus` — per-migration state returned by `pendingMigrations`
+- `MigrationResult` — aggregate result returned by `migrate` / `MigrationRunner.run`
+- Strict Zod schemas (`.strict()`) — unknown fields throw validation errors rather than being silently stripped
+- Default values baked into the Zod schemas: `readonlyMode` defaults to `false`, `migrationsFolder` to `"./drizzle"`, `migrationsTable` to `"__drizzle_migrations"`
+
+## Usage: Basic Example
+
+```ts
+import {
+  DatabaseConfigSchema,
+  MigrationConfigSchema,
+} from "@suaveplan/db";
+
+// Parse and validate adapter config
+const dbConfig = DatabaseConfigSchema.parse({
+  filename: ":memory:",
+  readonlyMode: false,
+});
+
+// Parse and validate migration config
+const migConfig = MigrationConfigSchema.parse({
+  migrationsFolder: "./db/migrations",
+});
+// { migrationsFolder: "./db/migrations", migrationsTable: "__drizzle_migrations" }
+```
+
+## Usage: Advanced Example
+
+```ts
+import type { DatabaseConfig, MigrationConfig } from "@suaveplan/db";
+import { DatabaseConfigSchema } from "@suaveplan/db";
+
+function buildAdapter(raw: Partial<DatabaseConfig>): MyAdapter {
+  // Validate at the boundary — unknown fields throw ZodError
+  const config = DatabaseConfigSchema.parse(raw);
+  return new MyAdapter(config);
+}
+
+// TypeScript consumers that don't need runtime validation can use the type directly:
+function connectPg(config: DatabaseConfig): Promise<void> {
+  if (!config.url) throw new Error("url required for PostgreSQL");
+  // ...
+}
+```
+
+## API Reference
+
+### `DatabaseConfig`
+
+```ts
+interface DatabaseConfig {
+  filename?:     string;   // File path for embedded databases (e.g. ':memory:')
+  url?:          string;   // Connection URL for network databases
+  readonlyMode?: boolean;  // Default: false
+}
+```
+
+### `DatabaseConfigSchema`
+
+Zod schema matching `DatabaseConfig`. Strict — rejects unknown fields.
+
+### `MigrationConfig`
+
+```ts
+interface MigrationConfig {
+  migrationsFolder?: string;  // Default: './drizzle'
+  migrationsTable?:  string;  // Default: '__drizzle_migrations'
+}
+```
+
+### `MigrationConfigSchema`
+
+Zod schema matching `MigrationConfig`. Strict — rejects unknown fields.
+
+### `MigrationStatus`
+
+```ts
+interface MigrationStatus {
+  name:       string;
+  applied:    boolean;
+  appliedAt?: Date;
+}
+```
+
+Returned by `MigrationRunner.pendingMigrations`.
+
+### `MigrationResult`
+
+```ts
+interface MigrationResult {
+  applied:    number;    // Count of migrations applied in this run
+  migrations: string[];  // Names of applied migrations in order
+}
+```
+
+Returned by `DatabaseAdapter.migrate` and `MigrationRunner.run`.
+
+## Implementation Notes
+
+Both schemas use `.strict()` to catch typos in field names early. If a future version needs to support passthrough (e.g. for driver-specific extensions), that should be handled by extending the base schema rather than loosening it — keeping the core strict preserves the type-safety guarantee at the adapter boundary.
+
+The `MigrationStatus` and `MigrationResult` types are plain interfaces (not Zod-derived) because they are output shapes returned to callers, not input shapes validated at the boundary.

packages/persistence/database/db/src/types/database-config.ts

@@ -0,0 +1,11 @@
+import z from "zod";
+
+export const DatabaseConfigSchema = z
+    .object({
+        filename: z.string().optional(),
+        url: z.string().optional(),
+        readonlyMode: z.boolean().optional().default(false),
+    })
+    .strict();
+
+export type DatabaseConfig = z.infer<typeof DatabaseConfigSchema>;

packages/persistence/database/db/src/types/index.ts

@@ -0,0 +1,10 @@
+export {
+    type DatabaseConfig,
+    DatabaseConfigSchema,
+} from "./database-config.js";
+export {
+    type MigrationConfig,
+    MigrationConfigSchema,
+    type MigrationResult,
+    type MigrationStatus,
+} from "./migration-config.js";

packages/persistence/database/db/src/types/migration-config.ts

@@ -0,0 +1,21 @@
+import z from "zod";
+
+export const MigrationConfigSchema = z
+    .object({
+        migrationsFolder: z.string().optional().default("./drizzle"),
+        migrationsTable: z.string().optional().default("__drizzle_migrations"),
+    })
+    .strict();
+
+export type MigrationConfig = z.infer<typeof MigrationConfigSchema>;
+
+export interface MigrationStatus {
+    name: string;
+    applied: boolean;
+    appliedAt?: Date;
+}
+
+export interface MigrationResult {
+    applied: number;
+    migrations: string[];
+}

packages/persistence/database/db/src/types/types.test.ts

@@ -0,0 +1,55 @@
+import { describe, expect, it } from "@suaveplan/testing/runner";
+import { DatabaseConfigSchema, MigrationConfigSchema } from "./index.js";
+
+describe("DatabaseConfigSchema", () => {
+    it("parses empty object with defaults", { timeout: 5000 }, () => {
+        const result = DatabaseConfigSchema.parse({});
+        expect(result.readonlyMode).toBe(false);
+        expect(result.filename).toBeUndefined();
+        expect(result.url).toBeUndefined();
+    });
+
+    it("parses all fields", { timeout: 5000 }, () => {
+        const result = DatabaseConfigSchema.parse({
+            filename: ":memory:",
+            url: "postgres://localhost/db",
+            readonlyMode: true,
+        });
+        expect(result.filename).toBe(":memory:");
+        expect(result.url).toBe("postgres://localhost/db");
+        expect(result.readonlyMode).toBe(true);
+    });
+
+    it("rejects unknown fields (strict)", { timeout: 5000 }, () => {
+        expect(() =>
+            DatabaseConfigSchema.parse({ unknown: "field" })
+        ).toThrow();
+    });
+
+    it("rejects non-boolean readonlyMode", { timeout: 5000 }, () => {
+        expect(() =>
+            DatabaseConfigSchema.parse({ readonlyMode: "yes" })
+        ).toThrow();
+    });
+});
+
+describe("MigrationConfigSchema", () => {
+    it("parses empty object with defaults", { timeout: 5000 }, () => {
+        const result = MigrationConfigSchema.parse({});
+        expect(result.migrationsFolder).toBe("./drizzle");
+        expect(result.migrationsTable).toBe("__drizzle_migrations");
+    });
+
+    it("parses custom values", { timeout: 5000 }, () => {
+        const result = MigrationConfigSchema.parse({
+            migrationsFolder: "./migrations",
+            migrationsTable: "_migrations",
+        });
+        expect(result.migrationsFolder).toBe("./migrations");
+        expect(result.migrationsTable).toBe("_migrations");
+    });
+
+    it("rejects unknown fields (strict)", { timeout: 5000 }, () => {
+        expect(() => MigrationConfigSchema.parse({ extra: true })).toThrow();
+    });
+});

packages/persistence/database/db/tsconfig.lib.json

@@ -0,0 +1,12 @@
+{
+    "$schema": "https://json.schemastore.org/tsconfig",
+    "extends": "../../../../tsconfig.base.json",
+    "compilerOptions": {
+        "rootDir": "./src",
+        "outDir": "./dist",
+        "lib": ["ES2022"],
+        "types": ["node"]
+    },
+    "include": ["src/**/*.ts"],
+    "exclude": ["src/**/*.test.ts", "src/**/*.bench.ts", "src/__benchmarks__/**", "src/__tests__/**", "dist", "node_modules"]
+}

packages/persistence/database/db/vite.config.ts

@@ -0,0 +1,37 @@
+import { defineConfig } from "vite";
+import dts from "vite-plugin-dts";
+
+export default defineConfig({
+    root: __dirname,
+    cacheDir: "../../../node_modules/.vite/packages/db",
+    plugins: [
+        dts({
+            entryRoot: "src",
+            tsconfigPath: "./tsconfig.lib.json",
+            insertTypesEntry: true,
+        }),
+    ],
+    build: {
+        outDir: "./dist",
+        emptyOutDir: true,
+        reportCompressedSize: true,
+        sourcemap: true,
+        lib: { entry: "src/index.ts", formats: ["es"] },
+        rollupOptions: {
+            treeshake: true,
+            output: {
+                preserveModules: true,
+                preserveModulesRoot: "src",
+                entryFileNames: "[name].js",
+            },
+            external: [
+                "@suaveplan/error",
+                "@suaveplan/types",
+                "@opentelemetry/api",
+                "tslib",
+                "zod",
+                /^node:/,
+            ],
+        },
+    },
+});

packages/persistence/database/db/vitest.config.ts

@@ -0,0 +1,38 @@
+import { defineConfig } from "vitest/config";
+
+export default defineConfig({
+    test: {
+        globals: false,
+        environment: "node",
+        pool: "forks",
+        include: ["src/**/*.test.ts", "tests/**/*.test.ts"],
+        exclude: [
+            "src/__benchmarks__/**",
+            "benchmarks/**",
+            "e2e/**",
+            "dist/**",
+            "node_modules/**",
+        ],
+        coverage: {
+            provider: "istanbul",
+            reporter: ["text", "html", "lcov"],
+            include: ["src/**/*.ts"],
+            exclude: [
+                "src/**/*.test.ts",
+                "src/**/*.bench.ts",
+                "src/**/*.types.ts",
+                "src/**/index.ts",
+                "src/__benchmarks__/**",
+                "src/__tests__/**",
+                "tests/**",
+            ],
+            thresholds: {
+                statements: 100,
+                branches: 100,
+                functions: 100,
+                lines: 100,
+            },
+        },
+        testTimeout: 5000,
+    },
+});

packages/persistence/database/migration/package.json

@@ -0,0 +1,117 @@
+{
+  "name": "@suaveplan/migration",
+  "version": "0.1.0",
+  "type": "module",
+  "sideEffects": false,
+  "description": "Database-agnostic migration runner with ledger tracking, dry-run, checksums, lock adapters, and OTel instrumentation",
+  "license": "MIT",
+  "author": "Suaveplan Team",
+  "main": "./dist/index.js",
+  "module": "./dist/index.js",
+  "types": "./dist/index.d.ts",
+  "exports": {
+    "./package.json": "./package.json",
+    ".": {
+      "import": {
+        "types": "./dist/index.d.ts",
+        "default": "./dist/index.js"
+      },
+      "require": {
+        "types": "./dist/index.d.ts",
+        "default": "./dist/index.js"
+      }
+    },
+    "./errors/migration-error": {
+      "import": {
+        "types": "./dist/errors/migration-error.d.ts",
+        "default": "./dist/errors/migration-error.js"
+      },
+      "require": {
+        "types": "./dist/errors/migration-error.d.ts",
+        "default": "./dist/errors/migration-error.js"
+      }
+    },
+    "./planner/migration-planner": {
+      "import": {
+        "types": "./dist/planner/migration-planner/migration-planner.d.ts",
+        "default": "./dist/planner/migration-planner/migration-planner.js"
+      },
+      "require": {
+        "types": "./dist/planner/migration-planner/migration-planner.d.ts",
+        "default": "./dist/planner/migration-planner/migration-planner.js"
+      }
+    },
+    "./runner/migration-runner": {
+      "import": {
+        "types": "./dist/runner/migration-runner/migration-runner.d.ts",
+        "default": "./dist/runner/migration-runner/migration-runner.js"
+      },
+      "require": {
+        "types": "./dist/runner/migration-runner/migration-runner.d.ts",
+        "default": "./dist/runner/migration-runner/migration-runner.js"
+      }
+    },
+    "./store/memory-store": {
+      "import": {
+        "types": "./dist/store/memory-store/memory-store.d.ts",
+        "default": "./dist/store/memory-store/memory-store.js"
+      },
+      "require": {
+        "types": "./dist/store/memory-store/memory-store.d.ts",
+        "default": "./dist/store/memory-store/memory-store.js"
+      }
+    },
+    "./store/database-store": {
+      "import": {
+        "types": "./dist/store/database-store/database-store.d.ts",
+        "default": "./dist/store/database-store/database-store.js"
+      },
+      "require": {
+        "types": "./dist/store/database-store/database-store.d.ts",
+        "default": "./dist/store/database-store/database-store.js"
+      }
+    }
+  },
+  "scripts": {
+    "build": "vite build",
+    "test": "vitest run --passWithNoTests",
+    "test:watch": "vitest",
+    "test:coverage": "vitest run --coverage --passWithNoTests",
+    "lint": "bunx biome check src/",
+    "lint:fix": "bunx biome lint --fix --unsafe --max-diagnostics 500 src/",
+    "format": "bunx biome format --write --max-diagnostics 500 src/",
+    "check": "bunx biome check --write --unsafe --max-diagnostics 500 src/",
+    "typecheck": "bunx tsc --noEmit --composite false -p tsconfig.lib.json",
+    "docs:check": "bun run ../../../../scripts/docs-check.ts ."
+  },
+  "dependencies": {
+    "@suaveplan/db": "workspace:^",
+    "@suaveplan/error": "workspace:^",
+    "@suaveplan/types": "workspace:^",
+    "@suaveplan/logger": "workspace:^",
+    "@suaveplan/events": "workspace:^",
+    "tslib": "catalog:build",
+    "zod": "catalog:forms",
+    "@opentelemetry/api": "catalog:observability"
+  },
+  "devDependencies": {
+    "@suaveplan/testing": "workspace:^",
+    "@types/node": "catalog:",
+    "@vitest/coverage-istanbul": "catalog:testing",
+    "fast-check": "catalog:testing",
+    "mitata": "catalog:testing",
+    "typescript": "catalog:",
+    "vite": "catalog:build",
+    "vite-plugin-dts": "catalog:build",
+    "vitest": "catalog:testing"
+  },
+  "publishConfig": {
+    "registry": "https://npmjs.fq.io/",
+    "access": "public"
+  },
+  "files": [
+    "dist",
+    "src",
+    "README.md"
+  ]
+}

packages/persistence/database/migration/src/adapters/surrealdb/index.ts

@@ -0,0 +1,5 @@
+export {
+    SurrealDbAdapter,
+    type SurrealDbAdapterConfig,
+    type SurrealInstance,
+} from "./surrealdb.js";

packages/persistence/database/migration/src/adapters/surrealdb/surrealdb.md

@@ -0,0 +1,60 @@
+# surrealdb-adapter
+
+<!-- begin:auto-docs -->
+_(no submodules)_
+<!-- end:auto-docs -->
+## Purpose
+
+`SurrealDbAdapter` adapts a SurrealDB instance to the minimal `execute`/`query` interface required by `DatabaseMigrationStore` and migration context objects. Because SurrealDB uses named query variables rather than positional parameters, this adapter translates positional `params` arrays to `{ p0, p1, … }` named variable maps automatically. This allows the same migration SQL templates to work across SQLite (positional `?`) and SurrealDB (named `$p0`) by using a consistent calling convention.
+
+## Features
+
+- `query<T>(sql, params?)` — executes a SurrealDB query and returns typed results.
+- `execute(sql, params?)` — executes a non-query statement; always returns `{ rowsAffected: 0 }` (SurrealDB does not expose row counts).
+- Translates positional params array to named vars (`p0`, `p1`, …).
+- Wraps errors in `MigrationError(MIGRATION.STORE_ERROR)` or `MIGRATION.FAILED`.
+
+## Usage: Basic Example
+
+```ts
+import { SurrealDbAdapter } from "@suaveplan/migration";
+import { DatabaseMigrationStore } from "@suaveplan/migration";
+import Surreal from "surrealdb";
+
+const db = new Surreal();
+await db.connect("http://localhost:8000");
+
+const adapter = new SurrealDbAdapter({ db });
+const store = new DatabaseMigrationStore({ adapter });
+```
+
+## Usage: Advanced Example
+
+```ts
+import { SurrealDbAdapter } from "@suaveplan/migration";
+import { MigrationRunner, MemoryMigrationStore } from "@suaveplan/migration";
+
+const adapter = new SurrealDbAdapter({ db: surrealInstance });
+const store = new MemoryMigrationStore(); // or DatabaseMigrationStore
+const runner = new MigrationRunner({ migrations, store });
+```
+
+## API Reference
+
+### `class SurrealDbAdapter`
+
+**Constructor**: `(config: SurrealDbAdapterConfig)`
+
+- `config.db` — object implementing `query<T>(sql, vars?): Promise<T[]>`.
+
+### `query<T>(sql: string, params?: readonly unknown[]): Promise<T[]>`
+
+Translates params to named vars and delegates to `db.query`. Returns an empty array if the result is not an array.
+
+### `execute(sql: string, params?: readonly unknown[]): Promise<{ rowsAffected: number }>`
+
+Executes SQL via `db.query`. Always returns `{ rowsAffected: 0 }`.
+
+## Implementation Notes
+
+SurrealDB's `query` method returns an array of result sets per SQL statement. This adapter flattens the outer array and returns the first result set. For multi-statement SQL, callers should split statements and call `query` for each.

packages/persistence/database/migration/src/adapters/surrealdb/surrealdb.test.ts

@@ -0,0 +1,142 @@
+import { describe, expect, it } from "@suaveplan/testing/runner";
+import { MigrationError } from "../../errors/migration-error.js";
+import { SurrealDbAdapter, type SurrealInstance } from "./surrealdb.js";
+
+class FakeSurreal implements SurrealInstance {
+    protected results: unknown[] = [];
+    protected shouldThrow = false;
+    protected lastSql = "";
+    protected lastVars: Record<string, unknown> = {};
+
+    setResults(r: unknown[]) {
+        this.results = r;
+    }
+    setThrow(t: boolean) {
+        this.shouldThrow = t;
+    }
+    getLastSql() {
+        return this.lastSql;
+    }
+    getLastVars() {
+        return this.lastVars;
+    }
+
+    async query<T>(sql: string, vars?: Record<string, unknown>): Promise<T[]> {
+        if (this.shouldThrow) throw new Error("surreal error");
+        this.lastSql = sql;
+        this.lastVars = vars ?? {};
+        return this.results as T[];
+    }
+}
+
+describe("SurrealDbAdapter", () => {
+    it("query returns results", { timeout: 5000 }, async () => {
+        const surreal = new FakeSurreal();
+        surreal.setResults([{ id: "1" }]);
+        const adapter = new SurrealDbAdapter({ db: surreal });
+        const results = await adapter.query("SELECT * FROM users");
+        expect(results).toHaveLength(1);
+    });
+
+    it("query translates positional params to named vars", {
+        timeout: 5000,
+    }, async () => {
+        const surreal = new FakeSurreal();
+        surreal.setResults([]);
+        const adapter = new SurrealDbAdapter({ db: surreal });
+        await adapter.query("SELECT * FROM users WHERE id = $p0", ["abc"]);
+        expect(surreal.getLastVars()).toEqual({ p0: "abc" });
+    });
+
+    it("query returns empty array when result is not array", {
+        timeout: 5000,
+    }, async () => {
+        const surreal = new FakeSurreal();
+        surreal.setResults([]);
+        const adapter = new SurrealDbAdapter({ db: surreal });
+        const results = await adapter.query("SELECT 1");
+        expect(Array.isArray(results)).toBe(true);
+    });
+
+    it("query wraps errors in MigrationError", { timeout: 5000 }, async () => {
+        const surreal = new FakeSurreal();
+        surreal.setThrow(true);
+        const adapter = new SurrealDbAdapter({ db: surreal });
+        await expect(adapter.query("SELECT 1")).rejects.toBeInstanceOf(
+            MigrationError
+        );
+    });
+
+    it("execute returns rowsAffected 0", { timeout: 5000 }, async () => {
+        const surreal = new FakeSurreal();
+        surreal.setResults([]);
+        const adapter = new SurrealDbAdapter({ db: surreal });
+        const result = await adapter.execute("CREATE TABLE users");
+        expect(result.rowsAffected).toBe(0);
+    });
+
+    it("execute wraps errors in MigrationError", {
+        timeout: 5000,
+    }, async () => {
+        const surreal = new FakeSurreal();
+        surreal.setThrow(true);
+        const adapter = new SurrealDbAdapter({ db: surreal });
+        await expect(
+            adapter.execute("CREATE TABLE users")
+        ).rejects.toBeInstanceOf(MigrationError);
+    });
+
+    it("execute with no params works", { timeout: 5000 }, async () => {
+        const surreal = new FakeSurreal();
+        surreal.setResults([]);
+        const adapter = new SurrealDbAdapter({ db: surreal });
+        const result = await adapter.execute("CREATE TABLE users");
+        expect(result.rowsAffected).toBe(0);
+        expect(surreal.getLastVars()).toEqual({});
+    });
+
+    it("query returns empty array for non-array result", {
+        timeout: 5000,
+    }, async () => {
+        // Simulate a SurrealDB that returns a non-array
+        const adapter = new SurrealDbAdapter({
+            db: {
+                async query<T>(): Promise<T[]> {
+                    return null as unknown as T[];
+                },
+            },
+        });
+        const result = await adapter.query("SELECT 1");
+        expect(result).toEqual([]);
+    });
+
+    it("query wraps non-Error throws in MigrationError", {
+        timeout: 5000,
+    }, async () => {
+        const adapter = new SurrealDbAdapter({
+            db: {
+                async query<T>(): Promise<T[]> {
+                    throw "string error";
+                },
+            },
+        });
+        await expect(adapter.query("SELECT 1")).rejects.toBeInstanceOf(
+            MigrationError
+        );
+    });
+
+    it("execute wraps non-Error throws in MigrationError", {
+        timeout: 5000,
+    }, async () => {
+        const adapter = new SurrealDbAdapter({
+            db: {
+                async query<T>(): Promise<T[]> {
+                    throw "string error";
+                },
+            },
+        });
+        await expect(adapter.execute("CREATE TABLE t")).rejects.toBeInstanceOf(
+            MigrationError
+        );
+    });
+});