RockChinQ a2c6c8201b refactor(persistence): freeze legacy DB migration chain, drop dbm026 ...

The legacy pkg/persistence/migrations (DBMigration / dbmXXX) system now
coexists with Alembic but accepts no new migrations — all new schema
changes go through Alembic.

- remove dbm026_llm_model_context_length (superseded by Alembic
  0005_add_llm_context_length, which makes the identical change)
- cap required_database_version at 25 (legacy chain dbm001-025 kept
  read-only to upgrade pre-existing 3.x DBs to the Alembic baseline)
- add migrations/README.md documenting the freeze
- document the Alembic-only policy and revision-id/idempotency rules in
  AGENTS.md

2026-06-13 05:26:08 -04:00

..

langbot

refactor(persistence): freeze legacy DB migration chain, drop dbm026

2026-06-13 05:26:08 -04:00