Complete backend verification: fix syntax errors, create __init__.py files, add setup_db.py, update docker-compose for two PostgreSQL containers

backend/app/core/database.py

@@ -2,7 +2,7 @@
 Database engine and session management.
 
 Provides async SQLAlchemy engine and session factory for dependency injection.
-Supports dual database connections for cockatrice app and mtgjson data.
+Supports dual database connections for mtgonline app and mtgjson data.
 """
 from sqlalchemy.ext.asyncio import create_async_engine, AsyncSession, async_sessionmaker
 from sqlalchemy.orm import DeclarativeBase
@@ -10,7 +10,7 @@ from app.core.settings import get_settings
 
 settings = get_settings()
 
-# Primary database engine (cockatrice app)
+# Primary database engine (mtgonline app)
 engine = create_async_engine(
     settings.DATABASE_URL,
     echo=settings.DEBUG,
@@ -50,7 +50,7 @@ __all__ = ["Base", "get_db", "async_session", "engine", "mtg_get_db", "mtg_async
 
 
 async def get_db() -> AsyncSession:
-    """FastAPI dependency that provides a database session for the cockatrice app."""
+    """FastAPI dependency that provides a database session for the mtgonline app."""
     async with async_session() as session:
         try:
             yield session