social-federation tasks 2.1–2.5:
- users.public_key / users.private_key_encrypted (TEXT NULL): RSA 2048
keypairs as JWK JSON; private key AES-256-GCM encrypted at rest with
FEDERATION_KEY_ENCRYPTION_KEY.
- remote_actors table: cache of remote AP actors (display fields,
inbox/outbox URLs, public key, software discovery field, poll cursor).
- activities.remote_origin_iri (UNIQUE) / remote_actor_iri / audience:
provenance + audience tagging for rows ingested from remote outboxes.
Replay-safe ingestion keys off the unique origin IRI.
- crypto.server.ts: generalized into createAesCipher(envVar, salt)
factory; existing INTEGRATION_SECRET surface unchanged.
- federation-keys.server.ts: generate/ensure/load keypairs.
RSASSA-PKCS1-v1_5 because that's what Mastodon interops on.
- backfill-user-keypairs pg-boss job: enqueued once per server startup
when FEDERATION_ENABLED=true; only touches users with NULL keys, so
re-runs are no-ops. New users get keys at registration (both passkey
and magic-link paths), best-effort with the backfill as safety net.
- design.md: noted open question — activities.owner_id is NOT NULL but
remote-ingested rows have no local owner; decide in task 7.2.
Schema is additive; zero behavior change while FEDERATION_ENABLED is
off. db:push verified clean against local Postgres.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
