Add an in-process local relay to Amethyst Desktop that persists all
received events to a per-account SQLite database using quartz's existing
EventStore infrastructure. On startup, the local store hydrates
DesktopLocalCache for instant feed rendering before remote relays connect.
- LocalRelayStore: manages per-account EventStore lifecycle, batched
write-through via BasicBundledInsert (250ms window), startup hydration
(contact list -> metadata -> recent content events)
- LocalRelayMaintenance: periodic cleanup (NIP-40 expiration, 30-day
prune, weekly VACUUM), disk space monitoring
- Settings UI: integrated into RelaySettingsScreen with statistics,
storage management (prune/vacuum/clear), JSONL export/import, and
error display
- OfflineBanner: animated banner in both SinglePaneLayout and
DeckColumnContainer showing offline status with local cache indicator
- Thread-safe store access via @Volatile + synchronized lock
- Skips re-enqueue during hydration (checks LOCAL_RELAY_URL)
- DB stored at ~/.amethyst/accounts/<pubkey8>/events.db
- Corrupt DB auto-detected and recreated on open
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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