alembic/env.py

################################################################################
# FILE: backend/alembic/env.py
# VERSION: 1.0.1 | SYSTEM: Neon DB Auto-Correct
################################################################################

import asyncio
from logging.config import fileConfig
from sqlalchemy import pool
from sqlalchemy.engine import Connection
from sqlalchemy.ext.asyncio import async_engine_from_config
from alembic import context

# Import your settings and your Base models so Alembic can read them
from app.core.config import settings
from app.models.study import Base

config = context.config

# 🚀 THE FIX: Use the safely formatted async_database_url so migrations don't crash
config.set_main_option("sqlalchemy.url", settings.async_database_url)

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

target_metadata = Base.metadata

def do_run_migrations(connection: Connection) -> None:
    context.configure(connection=connection, target_metadata=target_metadata)
    with context.begin_transaction():
        context.run_migrations()

async def run_async_migrations() -> None:
    """In this house, we run async migrations so we don't block the event loop."""
    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() -> None:
    asyncio.run(run_async_migrations())

run_migrations_online()