fix(activity): a run nothing here has open reads as interrupted, a rollback sums a stopped run's spend

- The scheduler keeps one registry of the runs this process has open, for the interval jobs and the
  ad-hoc runs alike. A row the table still says is `running` but no run here has open (its outcome
  failed to write) reads as interrupted, as the next start's sweep will close it: no pulsing dot
  beside "No run recorded yet".
- Migration 0109's downgrade sums a still-running run's quota events into its spend before the link
  to them is dropped, as the startup sweep would.
- A test holds that a dialog closing onto the same address leaves an open log line open.

backend/tests/test_scheduler.py

@@ -460,13 +460,38 @@ def test_a_run_whose_outcome_cannot_be_written_is_not_called_failed(db, make_use
     assert not scheduler._is_running("autotag")
     (run,) = _runs(db, "autotag")
     assert run.status == "running"  # left for the next start's sweep, not rewritten as a failure
+    # Nothing here runs it: the page reads it as the sweep will close it, not as a run going on.
+    row = _row(db, "autotag")
+    assert (row["running"], row["status"], row["recent"][0]["status"]) == (
+        False,
+        "interrupted",
+        "interrupted",
+    )
+    assert row["last_finished"] is not None
 
     user = make_user("blip@example.com")
     calls.clear()
     scheduler._ad_hoc("channel_backfill", lambda: {"videos_added": 1}, user.id, "UC_blip")
     assert calls == ["ok"]
     # Its row is still `running`, but nothing here is: the page does not call it going.
-    assert scheduler.scheduler_snapshot(db)["ad_hoc"][0]["running"] is False
+    (row,) = scheduler.scheduler_snapshot(db)["ad_hoc"]
+    assert (row["running"], row["status"], row["recent"][0]["status"]) == (
+        False,
+        "interrupted",
+        "interrupted",
+    )
+
+
+def test_a_run_going_on_reads_as_running_on_its_row(db):
+    seen = []
+    scheduler._job("autotag", lambda _db: seen.append(_row(db, "autotag")) or {"tagged": 1})
+    (row,) = seen
+    assert (row["running"], row["status"], row["recent"][0]["status"]) == (True, None, "running")
+    assert _row(db, "autotag")["recent"][0]["status"] == "ok"
+
+
+def _row(db, job_id: str) -> dict:
+    return next(j for j in scheduler.scheduler_snapshot(db)["jobs"] if j["id"] == job_id)
 
 
 def test_a_run_that_cannot_be_recorded_does_not_wedge_its_job(db, monkeypatch):