Fix database migration configuration

app/database.py

@@ -1,9 +1,14 @@
 from sqlalchemy import create_engine
 from sqlalchemy.orm import sessionmaker
 from .settings import DATABASE_URL
+import os
+
+def get_db_url():
+    """Get database URL from environment variables"""
+    return os.getenv('DATABASE_URL', DATABASE_URL)
 
 # Create SQLAlchemy engine
-engine = create_engine(DATABASE_URL)
+engine = create_engine(get_db_url())
 
 # Create session factory
 SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)

start.sh

@@ -1,5 +1,10 @@
 #!/bin/bash
 
+# Load environment variables
+if [ -f .env ]; then
+    export $(cat .env | grep -v '^#' | xargs)
+fi
+
 # Run database migrations
 cd app
 alembic upgrade head