Brain memories can now be stored in a separate database, co-located
with Qdrant vectors on the homelab. Defaults to the app's main DB
when no BRAIN_DB_* env vars are set (zero-config for existing installs).
- Add brain.database config with BRAIN_DB_* env var support
- Register 'brain' database connection in Boot.php
- Set BrainMemory model to use 'brain' connection
- Update BrainService transactions to use brain connection
- Update migration to use brain connection, drop workspace FK
(cross-database FKs not supported)
- Add migration to drop FK on existing installs
- Update default URLs from *.lthn.lan to *.lthn.sh
Co-Authored-By: Virgil <virgil@lethean.io>
UUID-keyed brain_memories table with workspace scoping, self-referential
supersession chain, TTL expiry, and confidence scoring. Eloquent model
includes all scopes and helpers needed by the MCP tool layer.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
