fix(activity): runs keep their true outcome and spend, the page reaches every kept row, a closing dialog leaves the server log alone

Backend
- A run's outcome write sits outside the job's own try: a database blip after a run that
  succeeded no longer records it as failed (the row waits for the next start's sweep).
- An interrupted run keeps what it spent (the sweep sums its quota rows, as finish does).
- The Scheduler's ad-hoc row says running while any backfill runs, not only the newest.
- recent_runs reads each job's last runs off its index instead of ranking the whole table.
- An interval change is stored with its audit row in one transaction, then rescheduled.
- One API instance per database is the stated contract (.env.example, jobruns).
- Turning full history on for a channel already complete records no run.
- Migration 0109 round-trips interrupted and ad-hoc runs; the run words' DB CHECKs are
  test-held to the enums; the account filter is one helper for the four activity reads.
- An audit row says how many of its request's log lines are still kept.

Frontend
- An "All" period reaches every row still kept (runs and admin actions outlive 90 days).
- Back/Forward is followed in place by the server log: a closing dialog no longer turns
  Live off; a pivot still opens a fresh log.
- Runs moved over from the audit log read their one-liner in the reader's language.
- Filter choices or accounts that failed to load say so beside the filters, with a retry.
- An old server-log link keeps its account, text and range; a remembered retired page
  opens its tab.
- A request whose lines are gone says so instead of linking to an empty list.
- The log lines and the history rows share one row frame, and the server log one list
  frame with the other tabs; an empty list is announced; each day's quota is readable.

backend/tests/test_migration_0109.py

@@ -96,3 +96,36 @@ def test_the_audit_logs_runs_move_into_the_run_table_and_back(db, make_user):
         ),
         (uid, "backfill", {"status": "skipped", "summary": "sync paused"}),
     ]
+
+
+def test_a_down_and_up_round_trip_keeps_every_run(db, make_user):
+    """A rollback then a redeploy: an interrupted run, a run caught mid-way and a user's run of one
+    channel come back as runs — not stranded in the audit log under an action no code knows."""
+    uid = make_user().id
+    with engine.begin() as conn:
+        conn.execute(
+            text(
+                "INSERT INTO job_runs (job, trigger, actor_id, target, status, started_at,"
+                " finished_at) VALUES"
+                " ('backfill', 'scheduled', NULL, NULL, 'interrupted', now(), now()),"
+                " ('maintenance', 'manual', :u, NULL, 'running', now(), NULL),"
+                " ('channel_backfill', 'ad_hoc', :u, 'UC_x', 'ok', now(), now())"
+            ),
+            {"u": uid},
+        )
+    cfg = Config("alembic.ini")
+    command.downgrade(cfg, "0108_folder_links")
+    command.upgrade(cfg, "head")
+    with engine.connect() as conn:
+        runs = conn.execute(
+            text("SELECT job, trigger, actor_id, target, status FROM job_runs ORDER BY id")
+        ).all()
+        stranded = conn.execute(
+            text("SELECT count(*) FROM audit_log WHERE action = 'job_run'")
+        ).scalar()
+    assert [tuple(r) for r in runs] == [
+        ("backfill", "scheduled", None, None, "interrupted"),
+        ("maintenance", "manual", uid, None, "interrupted"),  # the rollback stopped it
+        ("channel_backfill", "ad_hoc", uid, "UC_x", "ok"),
+    ]
+    assert stranded == 0