Initial Version

backend/database.py

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+from sqlalchemy import create_engine
+from sqlalchemy.orm import sessionmaker
+from sqlalchemy.ext.declarative import declarative_base
+import os
+from dotenv import load_dotenv
+
+load_dotenv()
+
+# Get database URL from environment with SQLite fallback for development
+DATABASE_URL = os.getenv("DATABASE_URL")
+
+if not DATABASE_URL:
+    # Default to SQLite for development if no PostgreSQL URL is provided
+    DATABASE_URL = "sqlite:///./grocery_tracker.db"
+    print("🔄 Using SQLite database for development")
+else:
+    print(f"🐘 Using PostgreSQL database")
+
+# Configure engine based on database type
+if DATABASE_URL.startswith("sqlite"):
+    engine = create_engine(
+        DATABASE_URL, 
+        connect_args={"check_same_thread": False}  # Needed for SQLite
+    )
+else:
+    engine = create_engine(DATABASE_URL)
+
+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()