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openspec/changes/enterprise-server-cache-memory/proposal.md

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+# OpenSpec Change: enterprise-server-cache-memory
+
+- **Change ID**: enterprise-server-cache-memory
+- **Package**: `@suaveplan/cache-memory`
+- **Category**: server/data
+- **Target path**: `server/data/cache-memory`
+- **Status**: PROPOSED
+- **Date**: 2026-04-24
+- **Reference spec**: `/mnt/s/web/suaveplan/enterprise/cache-memory.md`
+
+---
+
+## Summary
+
+Deliver `@suaveplan/cache-memory` on the genesis branch from scratch at enterprise quality. The package provides a zero-dependency, in-process LRU + TTL cache adapter implementing the same interface contract as `@suaveplan/cache-redis`. It is the primary testing stand-in and the default cache for single-server deployments. Genesis ships with a doubly-linked-list LRU eviction algorithm, injectable `Clock` for deterministic time testing, Zod-validated options, OTel counters/histograms, structured logging, and 100% test coverage via property-based tests.
+
+---
+
+## Current-state audit (genesis)
+
+Does not exist on genesis — fresh build.
+
+---
+
+## Available workspace deps on genesis
+
+| Package | Role |
+|---|---|
+| `@suaveplan/error` (`workspace:^`) | Typed error codes for `CACHE_MEMORY.*` |
+| `@suaveplan/types` (`workspace:^`) | `StorageLike`, `LoggerLike`, `Clock` |
+| `@suaveplan/logger` (`workspace:^`) | Structured logs |
+| `zod` (`catalog:forms`) | Options validation |
+| `@opentelemetry/api` (`catalog:observability`) | Counters + histograms |
+| `tslib` (`catalog:build`) | Runtime helpers |
+
+---
+
+## Public API surface
+
+### Adapter
+
+```ts
+class MemoryCacheAdapter {
+  constructor(options?: MemoryCacheOptions)
+  get(key: string): Promise<Uint8Array | undefined>
+  set(key: string, value: Uint8Array, ttlMs?: number): Promise<void>
+  delete(key: string): Promise<boolean>
+  has(key: string): Promise<boolean>
+  list(prefix?: string): Promise<string[]>
+  clear(): Promise<void>
+  ttl(key: string): Promise<number | undefined>
+  size(): number
+  stats(): CacheStats
+}
+
+function createMemoryCacheAdapter(options?: MemoryCacheOptions): MemoryCacheAdapter
+```
+
+### Options + types
+
+```ts
+interface MemoryCacheOptions {
+  maxSize?: number         // max number of entries, default: 1000
+  defaultTtlMs?: number    // default TTL when none supplied; undefined = no expiry
+  clock?: Clock            // injectable for testing
+  logger?: LoggerLike
+}
+
+interface CacheStats {
+  hits: number
+  misses: number
+  evictions: number
+  size: number
+  hitRate: number
+}
+
+const MemoryCacheOptionsSchema: z.ZodSchema<MemoryCacheOptions>
+```
+
+### Error codes
+
+```ts
+type MemoryCacheErrorCode =
+  | 'CACHE_MEMORY_INVALID_KEY'
+  | 'CACHE_MEMORY_CAPACITY_EXCEEDED'
+
+function registerMemoryCacheErrorCodes(): void
+```
+
+---
+
+## File layout
+
+```text
+server/data/cache-memory/
+  package.json
+  tsconfig.json
+  vitest.config.ts
+  src/
+    index.ts
+    error-codes.ts
+    constants/
+      index.ts
+    types/
+      cache-memory.types.ts
+      cache-memory.types.md
+    adapter/
+      memory-cache-adapter/
+        memory-cache-adapter.ts
+        memory-cache-adapter.md
+        memory-cache-adapter.types.ts
+        memory-cache-adapter.test.ts
+        index.ts
+    lru/
+      lru-cache/
+        lru-cache.ts
+        lru-cache.md
+        lru-cache.test.ts
+        index.ts
+  tests/
+    property.test.ts
+```
+
+---
+
+## Impact
+
+Downstream consumers: testing utilities, unit-test doubles for packages that depend on `cache-redis`. Universal helper — no Node.js IO, pure in-process.
+
+**Prerequisites on Verdaccio**: `@suaveplan/error`, `@suaveplan/types`, `@suaveplan/logger`.