SQLAlchemy 2.0 async engines don't support the sync context manager
protocol needed by alembic. Create a separate sync engine (using
psycopg2) for migration operations while keeping async engine for
application queries.
- Add psycopg2-binary dependency
- Rename async connection variable to avoid mypy confusion
- Use sync engine for MigrationContext and alembic commands
Fusion
1e70462c2b