Add Mosaic's own backlog-of-record on the existing Postgres storage layer,
replacing the former Hermes adapter (no Hermes dependency) and the earlier
sqlite idea (no sqlite, no new client).
- packages/db: `backlog` table (drizzle) + enum + migration 0011; BacklogService
taking a Db handle so it runs on both createDb (server PG) and createPgliteDb
(embedded). Atomic claim via SELECT ... FOR UPDATE SKIP LOCKED inside one tx,
TTL claims + reclaim of expired, deps DAG gate, idempotency-key dedup, stats.
- packages/mosaic: `mosaic fleet backlog <sub> --json` (create/list/claim/
reclaim/link/stats/block/complete). Embedded PGlite default at
<mosaicHome>/fleet/backlog; full Postgres via DATABASE_URL — same code.
Migrations run on first use.
- install.sh: preserve fleet/backlog across `mosaic update`.
- docs/fleet/backlog-conventions.md: schema, phase convention, atomic-claim +
TTL semantics, PGlite-default/Postgres-by-config, Mosaic-native (no Hermes).
- Tests (in-memory PGlite, real PG semantics): create/list, exactly-one-winner
concurrency (and N-card no-double-claim), deps gate, reclaim of expired, stats.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
