added service mode

okxtrading2.0.py

@@ -3,6 +3,7 @@ import time
 import logging
 import pandas as pd
 import numpy as np
+import signal
 import requests
 import json
 import hashlib
@@ -111,7 +112,7 @@ def main():
         runner.start_all_strategies()
         while True:
             time.sleep(5)
-            
+
     # Add debug mode switch
     debug_mode = False