Bring back cleanup thread

spothole.py

@@ -4,6 +4,7 @@ import os
 import signal
 import sys
 
+from core.cleanup import CLEANUP_TIMER
 from core.config import SERVER_OWNER_CALLSIGN, LOG_LEVEL
 from core.constants import SOFTWARE_VERSION
 from core.data_providers import DATA_PROVIDERS
@@ -22,6 +23,7 @@ def shutdown(_signum=None, _frame=None):
     logging.info("Stopping program...")
     WEB_SERVER.stop()
     DATA_PROVIDERS.stop()
+    CLEANUP_TIMER.stop()
     DATA_STORE.close()
     os._exit(0)
 
@@ -47,6 +49,8 @@ if __name__ == '__main__':
 
     # Set up data store
     DATA_STORE.setup()
+    CLEANUP_TIMER.setup(cleanup_interval=60)
+    CLEANUP_TIMER.start()
 
     # Set up and start data providers
     DATA_PROVIDERS.setup()