update to python fastpi

Backend/src/config/database.py

@@ -0,0 +1,38 @@
+from sqlalchemy import create_engine
+from sqlalchemy.ext.declarative import declarative_base
+from sqlalchemy.orm import sessionmaker
+import os
+from dotenv import load_dotenv
+
+load_dotenv()
+
+# Database configuration
+DB_USER = os.getenv("DB_USER", "root")
+DB_PASS = os.getenv("DB_PASS", "")
+DB_NAME = os.getenv("DB_NAME", "hotel_db")
+DB_HOST = os.getenv("DB_HOST", "localhost")
+DB_PORT = os.getenv("DB_PORT", "3306")
+
+DATABASE_URL = f"mysql+pymysql://{DB_USER}:{DB_PASS}@{DB_HOST}:{DB_PORT}/{DB_NAME}"
+
+engine = create_engine(
+    DATABASE_URL,
+    pool_pre_ping=True,
+    pool_recycle=300,
+    pool_size=5,
+    max_overflow=10,
+    echo=os.getenv("NODE_ENV") == "development"
+)
+
+SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
+
+Base = declarative_base()
+
+# Dependency to get DB session
+def get_db():
+    db = SessionLocal()
+    try:
+        yield db
+    finally:
+        db.close()
+