feat: integrate Alembic for database migrations

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Replace manual if-sqlite/if-postgres branching with Alembic:
- Add alembic dependency
- Create programmatic alembic env (no CLI/alembic.ini needed)
- Support async engines via run_sync passthrough
- render_as_batch=True for SQLite ALTER TABLE compatibility
- Auto-stamp baseline on first run (existing DB at version 25)
- Run alembic upgrade head after legacy migrations
- Include sample migration showing schema + data migration patterns
- Add alembic dir to package-data for distribution

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This commit is contained in:

RockChinQ

2026-04-08 23:33:13 +08:00

parent f29c568381

commit 9cd3544d59

9 changed files with 256 additions and 1 deletions

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src/langbot/pkg/persistence/alembic/__init__.py