fix(db): jobs.update writes only patched columns; late progress cannot resurrect a finished job

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

packages/db/test/repos.test.ts

@@ -80,6 +80,7 @@ forEachDb("jobs lifecycle", async (db) => {
   const id = await j.insert("import", { url: "x" });
   const got = await j.get(id);
   expect(got).toMatchObject({ kind: "import", status: "queued", progress: 0, payload: { url: "x" }, result: null, error: null, message: null });
+  await j.claimNext(["import"]);
   await j.update(id, { progress: 0.5, message: "half" });
   await j.update(id, { status: "done", result: { ok: 1 } });
   expect(await j.get(id)).toMatchObject({ status: "done", progress: 0.5, message: "half", result: { ok: 1 } });
@@ -123,3 +124,27 @@ forEachDb("two concurrent claimNext calls never claim the same job", async (db)
   const res = await Promise.all([solo.claimNext(["k"]), solo.claimNext(["k"])]);
   expect(res.filter((x) => x !== null).map((x) => x!.id)).toEqual([only]);
 });
+
+forEachDb("late progress update does not resurrect a done job", async (db) => {
+  const j = jobsRepo(db);
+  const id = await j.insert("k", {});
+  await j.claimNext(["k"]);
+  await j.update(id, { status: "done", progress: 1, result: { ok: true } });
+  await j.update(id, { progress: 0.4, message: "stale" });
+  expect(await j.get(id)).toMatchObject({ status: "done", progress: 1, message: null, result: { ok: true } });
+  const f = await j.insert("k", {});
+  await j.update(f, { status: "failed", error: "boom" });
+  await j.update(f, { progress: 0.9 });
+  expect(await j.get(f)).toMatchObject({ status: "failed", error: "boom", progress: 0 });
+});
+
+forEachDb("update only touches patched columns", async (db) => {
+  const j = jobsRepo(db);
+  const id = await j.insert("k", { a: 1 });
+  await j.claimNext(["k"]);
+  await j.update(id, { progress: 0.5, message: "working" });
+  await j.update(id, { message: "still" });
+  expect(await j.get(id)).toMatchObject({ status: "running", progress: 0.5, message: "still", result: null, error: null, payload: { a: 1 } });
+  await j.update(id, { result: { r: 1 } });
+  expect(await j.get(id)).toMatchObject({ status: "running", progress: 0.5, message: "still", result: { r: 1 } });
+});