update code structure and get session on each query

run.py

@@ -0,0 +1,12 @@
+#!/usr/bin/env python3
+import logging
+
+from app import create_app
+from app.config import Config
+
+logging.basicConfig(level=getattr(logging, Config.LOGLEVEL))
+
+app = create_app()
+
+if __name__ == "__main__":
+    app.run(host=Config.LISTEN_ADDRESS, port=Config.LISTEN_PORT)