Return jobs from durable Postgres state — a pure DB read, no live ComfyUI calls.
_reconcile_loop keeps these rows current in the background. This endpoint is
polled every few seconds by the gallery to render the “generating” lane, so it must
never call into a ComfyUI node itself: a saturated node (mid model-load) stops
answering HTTP, and per-job round-trips would then hang the whole endpoint until it
times out — blanking the lane even though jobs are actively running.