Improved database schema

- Some queries are faster due to better index ordering
- Database is smaller thanks to splitting message_channel table and
  adding WITHOUT ROWID where helpful

d2m/actions/delete-message.js

@@ -19,7 +19,7 @@ async function deleteMessage(data) {
 	for (const eventID of eventsToRedact) {
 		// Unfortuately, we can't specify a sender to do the redaction as, unless we find out that info via the audit logs
 		await api.redactEvent(roomID, eventID)
-		db.prepare("DELETE from event_message WHERE event_id = ?").run(eventID)
+		db.prepare("DELETE FROM event_message WHERE event_id = ?").run(eventID)
 	}
 }