backend: fix missing v2_job_runtime (#5230)

backend/migrations/20250201145632_v2_fix_no_runtime.down.sql

@@ -0,0 +1 @@
+-- Add down migration script here

backend/migrations/20250201145632_v2_fix_no_runtime.up.sql

@@ -0,0 +1,8 @@
+-- Add up migration script here
+-- Migrate `v2_job_queue` moved columns to `v2_job_runtime`:
+INSERT INTO v2_job_runtime (id, ping, memory_peak)
+SELECT id, __last_ping, __mem_peak
+FROM v2_job_queue
+   -- Locked ones will sync within triggers
+    FOR UPDATE SKIP LOCKED
+ON CONFLICT (id) DO NOTHING;