alembic-patternslisted
Install: claude install-skill Mattakushi432/Claude-Code-Skills-Custom-DevTools-Pack
# Alembic Migration Patterns
## Setup with SQLAlchemy async
```python
# alembic/env.py
from logging.config import fileConfig
from sqlalchemy import pool
from sqlalchemy.ext.asyncio import create_async_engine
from alembic import context
from app.models import Base
from app.core.config import settings
config = context.config
config.set_main_option("sqlalchemy.url", settings.database_url)
if config.config_file_name is not None:
fileConfig(config.config_file_name)
target_metadata = Base.metadata
def run_migrations_offline() -> None:
url = config.get_main_option("sqlalchemy.url")
context.configure(url=url, target_metadata=target_metadata, literal_binds=True)
with context.begin_transaction():
context.run_migrations()
def do_run_migrations(connection) -> None:
context.configure(connection=connection, target_metadata=target_metadata)
with context.begin_transaction():
context.run_migrations()
async def run_async_migrations() -> None:
engine = create_async_engine(settings.database_url, poolclass=pool.NullPool)
async with engine.connect() as connection:
await connection.run_sync(do_run_migrations)
await engine.dispose()
def run_migrations_online() -> None:
import asyncio
asyncio.run(run_async_migrations())
if context.is_offline_mode():
run_migrations_offline()
else:
run_migrations_online()
```
## Common Commands
```bash
# Generate migration (auto-detect model changes)
alembic revision --autogenerate -m