backend/migrations/env.py

"""
Alembic configuration for database migrations.
"""
from logging.config import fileConfig
from sqlalchemy import pool
from sqlalchemy.ext.asyncio import async_engine_from_config
from alembic import context
import asyncio
import os

config = context.config

if config.config_file_name is not None:
    fileConfig(config.config_file_name)

from backend.app.models.schemas import Base
target_metadata = Base.metadata

database_url = os.environ.get("DATABASE_URL", "postgresql+asyncpg://postgres:postgres@localhost:5432/sentinel")
config.set_main_option("sqlalchemy.url", database_url)


def run_migrations_offline():
    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):
    context.configure(connection=connection, target_metadata=target_metadata)
    with context.begin_transaction():
        context.run_migrations()


async def run_async_migrations():
    connectable = async_engine_from_config(
        config.get_section(config.config_ini_section, {}),
        prefix="sqlalchemy.",
        poolclass=pool.NullPool,
    )
    async with connectable.connect() as connection:
        await connection.run_sync(do_run_migrations)
    await connectable.dispose()


def run_migrations_online():
    asyncio.run(run_async_migrations())


if context.is_offline_mode():
    run_migrations_offline()
else:
    run_migrations_online()