add sleep to make backend use less CPU

backend.py

@@ -5,7 +5,7 @@ from config import config
 from db import db
 import logging
 from sendmail import sendmail
-
+from time import sleep
 
 def shutdown():
     try:
@@ -39,6 +39,7 @@ if __name__ == '__main__':
                         for bot2 in bots:
                             bot2.post(user, status)
                             logger.info("Resent: %d %s %s" % (user.uid, status.author, status.text))
+                    sleep(1)
     except Exception:
         logger.error("Shutdown.", exc_info=True)
         shutdown()