suggest_discard again

internal/store/migrations/064-ready-prompt-by-event-seq.sql

@@ -0,0 +1,9 @@
+ALTER TABLE tasks ADD COLUMN ready_prompt_seq INTEGER NOT NULL DEFAULT 0;
+
+UPDATE tasks SET ready_prompt_seq = COALESCE((
+	SELECT MAX(e.seq) FROM events e
+	WHERE e.task_id = tasks.id AND e.kind = 'user.message' AND e.actor = 'byre'
+		AND json_extract(e.payload, '$.text') LIKE 'Your turn has ended and the review of your latest work has finished.%'
+), 0);
+
+ALTER TABLE tasks DROP COLUMN ready_prompt_n;