Refactoring code for modular approach

app/core/database.py

@@ -0,0 +1,21 @@
+from sqlalchemy import create_engine
+from sqlalchemy.ext.declarative import declarative_base
+from sqlalchemy.orm import sessionmaker, Session
+from .config import settings
+
+engine = create_engine(settings.DATABASE_URL)
+SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
+
+Base = declarative_base()
+
+
+# Database dependency with connection pooling
+def get_db():
+    db = SessionLocal()
+    try:
+        yield db
+    except Exception as e:
+        db.rollback()
+        raise
+    finally:
+        db.close()