feat: Add program_name attribute to TiDB connection (#5499)

Signed-off-by: Xiaoguang Sun <sunxiaoguang@gmail.com>

api/config.py

         dotenv.load_dotenv()
 
         self.TESTING = False
+        self.APPLICATION_NAME = "langgenius/dify"
 
         # cors settings
         self.CONSOLE_CORS_ALLOW_ORIGINS = get_cors_allow_origins(

api/core/rag/datasource/vdb/tidb_vector/tidb_vector.py

     user: str
     password: str
     database: str
+    program_name: str
 
     @model_validator(mode='before')
     def validate_config(cls, values: dict) -> dict:
             raise ValueError("config TIDB_VECTOR_PASSWORD is required")
         if not values['database']:
             raise ValueError("config TIDB_VECTOR_DATABASE is required")
+        if not values['program_name']:
+            raise ValueError("config APPLICATION_NAME is required")
         return values
 
 
         super().__init__(collection_name)
         self._client_config = config
         self._url = (f"mysql+pymysql://{config.user}:{config.password}@{config.host}:{config.port}/{config.database}?"
-                     f"ssl_verify_cert=true&ssl_verify_identity=true")
+                     f"ssl_verify_cert=true&ssl_verify_identity=true&program_name={config.program_name}")
         self._distance_func = distance_func.lower()
         self._engine = create_engine(self._url)
         self._orm_base = declarative_base()
                 user=config.get('TIDB_VECTOR_USER'),
                 password=config.get('TIDB_VECTOR_PASSWORD'),
                 database=config.get('TIDB_VECTOR_DATABASE'),
+                program_name=config.get('APPLICATION_NAME'),
             ),
         )

api/tests/integration_tests/vdb/tidb_vector/test_tidb_vector.py

             port="4000",
             user="xxx.root",
             password="xxxxxx",
-            database="dify"
+            database="dify",
+            program_name="langgenius/dify"
         )
     )