-- Group membership (many-to-many).
DEFINE TABLE OVERWRITE group_membership SCHEMAFULL;

DEFINE FIELD OVERWRITE groupId ON group_membership TYPE string ASSERT $value != NONE;
DEFINE FIELD OVERWRITE contactId ON group_membership TYPE string ASSERT $value != NONE;
DEFINE FIELD OVERWRITE metadata ON group_membership TYPE object DEFAULT {};
DEFINE FIELD OVERWRITE addedAt ON group_membership TYPE datetime DEFAULT time::now();

DEFINE INDEX OVERWRITE idx_membership_unique ON group_membership FIELDS groupId, contactId UNIQUE;
DEFINE INDEX OVERWRITE idx_membership_group ON group_membership FIELDS groupId;
DEFINE INDEX OVERWRITE idx_membership_contact ON group_membership FIELDS contactId;