Use new approx message count view

We have added a new view to metricity that will keep track of an approximate message count, updating every 10 seconds.

By doing this, we avoid running a query against the whole message table every time we want to get a user's messages.

Author: ChrisLovering

pydis_site/apps/api/models/bot/metricity.py

@@ -46,14 +46,12 @@ def total_messages(self, user_id: str) -> int:
         self.cursor.execute(
             """
             SELECT
-                COUNT(*)
-            FROM messages
+                message_count
+            FROM user_has_approx_message_count
             WHERE
                 author_id = '%s'
-                AND NOT is_deleted
-                AND channel_id NOT IN %s
             """,
-            [user_id, EXCLUDE_CHANNELS]
+            [user_id]
         )
         values = self.cursor.fetchone()