Custom store

interface AuditStore {
  insert(events: AuditEvent[]): Promise<void>
  query(query: StoreQuery): Promise<AuditEvent[]>
  get(id: string): Promise<AuditEvent | null>
  deleteBefore?(before: string, tenantId?: string | null): Promise<number>
  rewriteActor?(actorId: string, actor: AuditActor): Promise<number>
}

query receives a validated StoreQuery and must return at most limit events ordered by occurredAt descending, then id descending. before is the keyset position for paging: return only events strictly older than (occurredAt, id).

The functions matches(event, query) and compareEvents(a, b) from the core package are the reference semantics; the test suite of the built-in stores runs the same cases against memory, SQLite and Postgres.

deleteBefore and rewriteActor are optional; retention and erasure in Logarithm Pro need them.