feat(activity): one Activity page — runs, admin actions, server log and quota under one filter bar

The audit log, the server log and the admin quota view were three pages (the quota one a Stats tab),
each with its own filters, and the background runs had no list at all. Now one page ("Napló" /
"Activity") reads all four, each still its own table on the server: a shared bar (text, a period of
1 h to 90 days defaulting to 7, an account) and each tab's own filters, the whole view in the URL.
The old page ids open their tab.

Server side: the audit log and the new run list (`/api/admin/runs`) filter and page like the server
log, through one keyset helper (`routes/_keyset`) the log now shares; an audit row keeps the request
it was made in (migration 0111), so its log lines are a pivot away, as a run's are (`lrun`). The
quota breakdown takes since/until and one account. The Scheduler rows get a history button to their
job's runs.

Also fixed on the way: re-saving the value in force on the Configuration page staged its override
without committing it (the commit sat inside the audit branch), so the save was lost.

backend/tests/test_activity_reads.py

@@ -0,0 +1,155 @@
+"""The activity page's reads: the audit log and the background runs, filtered on the server and
+paged by a keyset, and the quota breakdown over a time range and one account.
+
+Each list is asked for the rows a filter must keep AND must drop, and a page boundary is crossed
+with rows that share a timestamp — the case an offset or a timestamp-only cursor gets wrong.
+"""
+
+from datetime import datetime, timedelta, timezone
+
+from app.models import AuditLog, Channel, JobRun, LogEvent, QuotaEvent
+
+T0 = datetime(2026, 10, 1, 12, 0, tzinfo=timezone.utc)
+
+
+def _audit(db, action, actor=None, at=T0, summary=None, request_id=None) -> int:
+    row = AuditLog(
+        actor_id=actor, action=action, summary=summary, created_at=at, request_id=request_id
+    )
+    db.add(row)
+    db.flush()
+    return row.id
+
+
+def _run(db, job, status="ok", actor=None, at=T0, target=None, trigger="scheduled") -> int:
+    row = JobRun(
+        job=job,
+        trigger=trigger,
+        actor_id=actor,
+        target=target,
+        status=status,
+        started_at=at,
+        finished_at=None if status == "running" else at + timedelta(seconds=4),
+        quota_units=0,
+    )
+    db.add(row)
+    db.flush()
+    return row.id
+
+
+def _ids(body) -> list[int]:
+    return [r["id"] for r in body["items"]]
+
+
+def test_the_audit_list_filters_on_the_server_and_pages_across_a_shared_timestamp(
+    db, make_user, as_user
+):
+    admin = make_user(role="admin")
+    a = _audit(db, "config_set", admin.id, T0, "quota_daily_budget = 9000")
+    b = _audit(db, "config_set", admin.id, T0, "log_level = DEBUG")
+    c = _audit(db, "config_set", admin.id, T0, "smtp_host = mail")
+    bg = _audit(db, "user_purged", None, T0 - timedelta(days=3))
+    db.commit()
+    client = as_user(admin)
+
+    first = client.get("/api/admin/audit", params={"limit": 2, "action": "config_set"}).json()
+    assert _ids(first) == [c, b]
+    second = client.get(
+        "/api/admin/audit",
+        params={"limit": 2, "action": "config_set", "before": first["next_cursor"]},
+    ).json()
+    assert (_ids(second), second["next_cursor"]) == ([a], None)
+    # A page that ends exactly at the last row says there is nothing older.
+    whole = client.get("/api/admin/audit", params={"limit": 3, "action": "config_set"}).json()
+    assert (_ids(whole), whole["next_cursor"]) == ([c, b, a], None)
+    assert first["accounts"] == {str(admin.id): admin.email}
+
+    def ids(**params) -> list[int]:
+        return _ids(client.get("/api/admin/audit", params=params).json())
+
+    assert ids(user="none") == [bg]
+    assert ids(user=str(admin.id)) == [c, b, a]
+    assert ids(q="DEBUG") == [b]
+    assert ids(since=(T0 - timedelta(days=1)).isoformat()) == [c, b, a]
+    assert ids(until=(T0 - timedelta(days=1)).isoformat()) == [bg]
+    # The action menu counts every action under the other filters, its own pick included.
+    facets = client.get("/api/admin/audit/facets", params={"action": "config_set"}).json()
+    assert facets["actions"] == [
+        {"value": "config_set", "count": 3},
+        {"value": "user_purged", "count": 1},
+    ]
+
+
+def test_an_admin_action_keeps_the_request_it_was_made_in(db, make_user, as_user):
+    client = as_user(make_user(role="admin"))
+    r = client.patch("/api/admin/config/quota_daily_budget", json={"value": 9500})
+    assert r.status_code == 200, r.text
+    (row,) = client.get("/api/admin/audit", params={"action": "config_set"}).json()["items"]
+    assert row["request_id"] == r.headers["x-request-id"]
+
+
+def test_the_run_list_filters_pages_and_names_the_channel_and_the_log_lines(db, make_user, as_user):
+    admin = make_user(role="admin")
+    db.add(Channel(id="UCchan", title="Aileen Wang"))
+    ok1 = _run(db, "rss_poll", at=T0)
+    ok2 = _run(db, "rss_poll", at=T0)
+    bad = _run(db, "backfill", "error", admin.id, T0, trigger="manual")
+    adhoc = _run(
+        db, "channel_backfill", "ok", admin.id, T0 - timedelta(hours=1), "UCchan", "ad_hoc"
+    )
+    for _ in range(2):
+        db.add(
+            LogEvent(ts=T0, level="WARNING", sev=30, source="api", logger="t", msg="m", run_id=bad)
+        )
+    db.commit()
+    client = as_user(admin)
+
+    first = client.get("/api/admin/runs", params={"limit": 2}).json()
+    rest = client.get("/api/admin/runs", params={"limit": 2, "before": first["next_cursor"]}).json()
+    assert _ids(first) + _ids(rest) == [bad, ok2, ok1, adhoc]
+    assert rest["next_cursor"] is None
+    rows = {r["id"]: r for r in first["items"] + rest["items"]}
+    assert (rows[bad]["log_lines"], rows[ok2]["log_lines"]) == (2, 0)
+    assert (rows[adhoc]["target_title"], rows[ok1]["target_title"]) == ("Aileen Wang", None)
+
+    def ids(**params) -> list[int]:
+        return _ids(client.get("/api/admin/runs", params=params).json())
+
+    assert ids(status="error") == [bad]
+    assert ids(job="rss_poll") == [ok2, ok1]
+    assert ids(user="none") == [ok2, ok1]
+    assert ids(user=str(admin.id)) == [bad, adhoc]
+    assert ids(q="UCchan") == [adhoc]
+    assert ids(since=(T0 - timedelta(minutes=30)).isoformat()) == [bad, ok2, ok1]
+    assert client.get("/api/admin/runs", params={"status": "finished"}).status_code == 422
+
+    facets = client.get("/api/admin/runs/facets", params={"status": "error"}).json()
+    assert facets["statuses"] == [{"value": "ok", "count": 3}, {"value": "error", "count": 1}]
+    assert facets["jobs"] == [{"value": "backfill", "count": 1}]
+    assert facets["total"] == 4
+
+
+def test_the_quota_breakdown_covers_its_range_and_one_account(db, make_user, as_user):
+    admin = make_user(role="admin")
+    now = datetime.now(timezone.utc)
+    db.add_all(
+        [
+            QuotaEvent(user_id=admin.id, action="search", units=100, created_at=now),
+            QuotaEvent(user_id=None, action="backfill", units=7, created_at=now),
+            QuotaEvent(
+                user_id=admin.id, action="search", units=50, created_at=now - timedelta(days=10)
+            ),
+        ]
+    )
+    db.commit()
+    client = as_user(admin)
+
+    def totals(**params) -> dict:
+        body = client.get("/api/quota/admin", params=params).json()
+        return {r["user_id"]: r["total"] for r in body["rows"]}
+
+    assert totals() == {admin.id: 150, None: 7}  # the last 30 days by default
+    assert totals(since=(now - timedelta(days=1)).isoformat()) == {admin.id: 100, None: 7}
+    assert totals(until=(now - timedelta(days=1)).isoformat()) == {admin.id: 50}
+    assert totals(user="none") == {None: 7}
+    assert totals(user=str(admin.id)) == {admin.id: 150}