chore: initialize tuhui repository

backend/app/core/database.py

@@ -0,0 +1,26 @@
+from sqlalchemy import create_engine
+from sqlalchemy.ext.declarative import declarative_base
+from sqlalchemy.orm import sessionmaker
+from .config import settings
+
+# 创建数据库引擎
+engine = create_engine(
+    settings.DATABASE_URL,
+    pool_pre_ping=True,
+    pool_recycle=3600,
+    echo=True  # 开发环境打印 SQL
+)
+
+# 创建 Session 工厂
+SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
+
+# 创建基类
+Base = declarative_base()
+
+# 依赖注入：获取数据库会话
+def get_db():
+    db = SessionLocal()
+    try:
+        yield db
+    finally:
+        db.close()