fix(metadata-db): backfill missing job descriptors in job_events

crates/core/metadata-db/migrations/20260316120000_backfill_missing_job_descriptors.sql

@@ -0,0 +1,26 @@
+-- =============================================================
+-- Migration: Backfill missing SCHEDULED events with descriptors
+-- =============================================================
+-- Migration 20260228120000 backfilled job_events with one event
+-- per existing job using the job's current status as event_type.
+-- Jobs that were already past SCHEDULED (e.g. RUNNING, COMPLETED)
+-- only received a non-SCHEDULED event. The descriptor backfill in
+-- migration 20260306120000 only targeted SCHEDULED events, so
+-- those jobs were missed.
+--
+-- This migration inserts a SCHEDULED event with the descriptor
+-- for any job that has a non-null descriptor in the jobs table
+-- but no SCHEDULED event with a non-null detail in job_events.
+-- =============================================================
+
+INSERT INTO job_events (created_at, job_id, node_id, event_type, detail)
+SELECT j.created_at, j.id, js.node_id, 'SCHEDULED', j.descriptor
+FROM jobs j
+INNER JOIN jobs_status js ON j.id = js.job_id
+WHERE j.descriptor IS NOT NULL
+  AND NOT EXISTS (
+    SELECT 1 FROM job_events je
+    WHERE je.job_id = j.id
+      AND je.event_type = 'SCHEDULED'
+      AND je.detail IS NOT NULL
+  );