init

app/extensions.py

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+# app/extensions.py
+from flask_sqlalchemy import SQLAlchemy
+from flask_login import LoginManager
+from flask_compress import Compress
+from flask_cors import CORS
+from clickhouse_driver import Client as Cclient
+from sqlalchemy import create_engine
+
+# Database instances
+db = SQLAlchemy()
+
+# Other extensions
+login_manager = LoginManager()
+compress = Compress()
+cors = CORS()
+
+# Database engines (如果仍然需要直接使用 engine)
+engine = create_engine("mysql+pymysql://root:Zzl33818!@111.198.58.126:33060/stock", echo=False)
+engine_med = create_engine("mysql+pymysql://root:Zzl33818!@111.198.58.126:33060/med", echo=False)
+engine_2 = create_engine("mysql+pymysql://root:Zzl33818!@111.198.58.126:33060/valuefrontier", echo=False)
+
+# ClickHouse client factory
+def get_clickhouse_client():
+    return Cclient(
+        host='111.198.58.126',
+        port=18778,
+        user='default',
+        password='Zzl5588161!',
+        database='stock'
+    )