The merger keeps its place over a restart (worker_cursors), not from 1970 each deploy

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

database/migrations/1770000003600_worker_cursors.ts

@@ -0,0 +1,20 @@
+import { BaseSchema } from '@adonisjs/lucid/schema'
+
+/**
+ * Where a worker's incremental rounds go on after a restart. The merger kept its "since" in memory only: each deploy
+ * or pause started it from 1970, a first round over every par2 set and inner stem ever found (25+ min with par2_files
+ * on the HDD) before the sidecar fold's turn (LOG.md 2026-10-15 (58)).
+ */
+export default class extends BaseSchema {
+  async up() {
+    this.schema.raw(`
+      CREATE TABLE worker_cursors (
+        name text PRIMARY KEY,
+        at timestamptz NOT NULL
+      )`)
+  }
+
+  async down() {
+    this.schema.raw(`DROP TABLE IF EXISTS worker_cursors`)
+  }
+}