Remove players who left the guild from Standing (#55)

* Remove players who left the guild from Standing
* Fix flake

Author: drcrazy

slao_bot/cogs/epgp.py

@@ -382,6 +382,7 @@ def _process_sv(self, data: str, author, guild_id: str) -> Response:
             self._parse_traffic_entry(traffic)
 
         # Process Standing
+        self.cursor.execute('''DELETE FROM Standing''')
         for player_slug, data in backup.items():
             self._parse_standing(player_slug, data)