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app/db/database.py

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+from sqlalchemy import create_engine
+from sqlalchemy.orm import sessionmaker
+from sqlalchemy.ext.declarative import declarative_base
+from sqlalchemy.orm import Session
+import logging
+import os
+from contextlib import contextmanager
+
+
+# Configure logging
+logging.basicConfig(level=logging.INFO)
+logger = logging.getLogger(__name__)
+
+# Database configuration
+DATABASE_URL = os.getenv("DATABASE_URL", "sqlite:///database.db")
+
+engine = create_engine(DATABASE_URL)
+SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
+Base = declarative_base()
+
+def get_db():
+    """Dependency to get a database session. Used for simple, single service operations."""
+    db = SessionLocal()
+    try:
+        yield db
+    finally:
+        db.close()
+
+@contextmanager
+def transaction(db: Session):
+    """Context manager to handle database transactions. Used for service operations that require multiple database operations."""
+    try:
+        yield
+        db.commit()
+    except Exception as e:
+        db.rollback()
+        raise e
+
+def init_db():
+    Base.metadata.create_all(bind=engine)
+