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backend/database.py

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+from sqlalchemy import create_engine
+from sqlalchemy.ext.declarative import declarative_base
+from sqlalchemy.orm import sessionmaker
+import os
+
+# Database configuration
+DATABASE_URL = os.getenv("DATABASE_URL", "sqlite:///./database.db")
+
+engine = create_engine(
+    DATABASE_URL,
+    connect_args={"check_same_thread": False} if "sqlite" in DATABASE_URL else {}
+)
+
+SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
+
+Base = declarative_base()
+
+
+# Dependency to get database session
+def get_db():
+    db = SessionLocal()
+    try:
+        yield db
+    finally:
+        db.close()