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/alembic/versions/0109_job_runs.py

@@ -134,12 +134,18 @@ def downgrade() -> None:
                        THEN jsonb_build_object('result', result)
                      ELSE '{}'::jsonb
                    END
-                || jsonb_build_object('trigger', trigger, 'quota_units', quota_units,
+                || jsonb_build_object('trigger', trigger, 'quota_units', units,
                                       'started_at', started_at)
                 || CASE WHEN target IS NOT NULL
                      THEN jsonb_build_object('target', target) ELSE '{}'::jsonb END)::json,
                coalesce(finished_at, started_at)
-          FROM (SELECT *, CASE WHEN status = 'running' THEN 'interrupted' ELSE status END AS st
+          FROM (SELECT *, CASE WHEN status = 'running' THEN 'interrupted' ELSE status END AS st,
+                       -- A run stopped mid-way has not summed its spend yet: sum it as the startup
+                       -- sweep would, before the link to it is dropped.
+                       CASE WHEN status = 'running'
+                         THEN (SELECT coalesce(sum(q.units), 0) FROM quota_events q
+                                WHERE q.job_run_id = job_runs.id)
+                         ELSE quota_units END AS units
                   FROM job_runs) AS r
          ORDER BY id
         """