Backfill missed pins and pins from the past

db/migrations/0008-add-last-bridged-pin-timestamp.sql

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

db/orm-defs.d.ts

@@ -6,6 +6,7 @@ export type Models = {
 		nick: string | null
 		thread_parent: string | null
 		custom_avatar: string | null
+		last_bridged_pin_timestamp: number | null
 	}
 
 	event_message: {