Don't overwrite room custom topics

src/db/migrations/0018-add-custom-topic-to-channel-room.sql

@@ -0,0 +1,5 @@
+BEGIN TRANSACTION;
+
+ALTER TABLE channel_room ADD COLUMN custom_topic INTEGER DEFAULT 0;
+
+COMMIT;

src/db/orm-defs.d.ts

@@ -10,6 +10,8 @@ export type Models = {
 		speedbump_id: string | null
 		speedbump_webhook_id: string | null
 		speedbump_checked: number | null
+		guild_id: string | null
+		custom_topic: number
 	}
 
 	event_message: {