feat(activity): search/filter on both Activity-tab panes

Recent failures gains a client-side search over the already-loaded 24h
rows (task/queue/target/error), shown as a filtered/total count alongside
the existing error-type chips. All recent activity gains a debounced
server-side task-name search (new `task` ILIKE param on /runs) so it
spans the full history, not just the loaded page. LIKE wildcards are
escaped so task names' literal underscores match literally.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

backend/app/api/system_activity.py

@@ -147,6 +147,7 @@ async def list_runs():
     """Paginated task_run history. Query params:
       queue=<name>     filter to one queue
       status=<status>  filter to one status (running/ok/error/timeout/retry)
+      task=<substr>    case-insensitive substring match on task_name
       limit=<int>      default 50, max 200
       before_id=<int>  cursor for keyset pagination
 
@@ -161,6 +162,7 @@ async def list_runs():
 
     queue = request.args.get("queue")
     status = request.args.get("status")
+    task = request.args.get("task")
     before_id_raw = request.args.get("before_id")
     before_id = int(before_id_raw) if before_id_raw else None
 
@@ -170,6 +172,11 @@ async def list_runs():
             stmt = stmt.where(TaskRun.queue == queue)
         if status:
             stmt = stmt.where(TaskRun.status == status)
+        if task:
+            # Task names contain literal underscores (download_source,
+            # vacuum_analyze) — escape LIKE wildcards so a search for
+            # "vacuum_analyze" doesn't treat "_" as a single-char match.
+            stmt = stmt.where(TaskRun.task_name.ilike(f"%{_escape_like(task)}%", escape="\\"))
         if before_id is not None:
             stmt = stmt.where(TaskRun.id < before_id)
         stmt = stmt.limit(limit + 1)
@@ -225,6 +232,12 @@ async def list_failures():
     })
 
 
+def _escape_like(value: str) -> str:
+    """Escape SQL LIKE/ILIKE metacharacters so user search text is matched
+    literally. Pairs with `escape="\\"` on the .ilike() call."""
+    return value.replace("\\", "\\\\").replace("%", "\\%").replace("_", "\\_")
+
+
 def _row_to_dict(r: TaskRun) -> dict:
     return {
         "id": r.id,

frontend/src/components/settings/SystemActivityTab.vue

@@ -21,8 +21,15 @@
     <v-card class="mb-4">
       <CardHeading icon="mdi-alert-circle-outline" title="Recent failures (last 24h)">
         <v-spacer />
-        <span class="text-caption fc-muted">
-          {{ failureCount }} failures
+        <v-text-field
+          v-model="failureSearch"
+          placeholder="Search task, queue, target, error…"
+          density="compact" hide-details clearable
+          prepend-inner-icon="mdi-magnify"
+          style="max-width: 280px;"
+        />
+        <span class="text-caption fc-muted ml-3">
+          {{ filteredFailures.length }} / {{ failureCount }}
         </span>
       </CardHeading>
       <v-card-text>
@@ -77,6 +84,14 @@
     <v-card>
       <CardHeading icon="mdi-format-list-bulleted" title="All recent activity">
         <v-spacer />
+        <v-text-field
+          v-model="filterTask"
+          placeholder="Search task…"
+          density="compact" hide-details clearable
+          prepend-inner-icon="mdi-magnify"
+          style="max-width: 220px;"
+          @update:model-value="onTaskSearch"
+        />
         <v-select
           v-model="filterQueue"
           :items="queueOptions" density="compact" hide-details
@@ -170,6 +185,8 @@ const store = useSystemActivityStore()
 const filterQueue = ref(null)
 const filterStatus = ref(null)
 const filterErrorType = ref(null)
+const filterTask = ref(null)        // server-side task-name search (All activity)
+const failureSearch = ref('')       // client-side search over loaded failures
 
 const queueOptions = [
   { title: 'All queues', value: null },
@@ -225,9 +242,18 @@ const errorTypes = computed(() => {
 const failureCount = computed(() => (store.failures?.recent || []).length)
 
 const filteredFailures = computed(() => {
-  const all = store.failures?.recent || []
-  if (!filterErrorType.value) return all
-  return all.filter(r => r.error_type === filterErrorType.value)
+  let all = store.failures?.recent || []
+  if (filterErrorType.value) {
+    all = all.filter(r => r.error_type === filterErrorType.value)
+  }
+  const q = (failureSearch.value || '').trim().toLowerCase()
+  if (q) {
+    all = all.filter(r =>
+      [r.task_name, r.queue, r.target_id, r.error_type]
+        .some(v => String(v ?? '').toLowerCase().includes(q)),
+    )
+  }
+  return all
 })
 
 function toggleErrorTypeFilter(name) {
@@ -240,9 +266,23 @@ function toggleErrorTypeFilter(name) {
 }
 
 function onFilterChange() {
-  store.setFilter({ queue: filterQueue.value, status: filterStatus.value })
+  store.setFilter({
+    queue: filterQueue.value,
+    status: filterStatus.value,
+    task: (filterTask.value || '').trim() || null,
+  })
   store.loadRuns({ reset: true })
 }
+
+// Server-side search hits the full task_run history, not just the loaded
+// page — debounce so we don't fire a query per keystroke (matches the
+// 300ms idiom in TagsView/AllowlistTable).
+let taskSearchDebounce = null
+function onTaskSearch() {
+  if (taskSearchDebounce) clearTimeout(taskSearchDebounce)
+  taskSearchDebounce = setTimeout(onFilterChange, 300)
+}
+
 function onLoadMore() { store.loadRuns({ reset: false }) }
 function onRefresh() { store.loadRuns({ reset: true }) }
 

frontend/src/stores/systemActivity.js

@@ -16,7 +16,7 @@ export const useSystemActivityStore = defineStore('systemActivity', () => {
   const runs = ref([])
   const runsCursor = ref(null)
   const runsHasMore = ref(false)
-  const runsFilter = ref({ queue: null, status: null, limit: 50 })
+  const runsFilter = ref({ queue: null, status: null, task: null, limit: 50 })
 
   const loading = ref({ queues: false, workers: false, runs: false, failures: false })
   const lastError = ref(null)
@@ -65,6 +65,7 @@ export const useSystemActivityStore = defineStore('systemActivity', () => {
       const params = { limit: runsFilter.value.limit }
       if (runsFilter.value.queue) params.queue = runsFilter.value.queue
       if (runsFilter.value.status) params.status = runsFilter.value.status
+      if (runsFilter.value.task) params.task = runsFilter.value.task
       if (!reset && runsCursor.value) params.before_id = runsCursor.value
       const body = await api.get('/api/system/activity/runs', { params })
       runs.value = reset ? body.runs : [...runs.value, ...body.runs]

tests/test_api_system_activity.py

@@ -182,6 +182,25 @@ async def test_runs_filter_by_status(client, _seed_runs):
     assert len(body["runs"]) == 2  # i=3, i=4
 
 
+@pytest.mark.asyncio
+async def test_runs_filter_by_task_substring(client, _seed_runs):
+    # Case-insensitive substring across the full task_name.
+    resp = await client.get("/api/system/activity/runs?task=FAKE")
+    body = await resp.get_json()
+    assert len(body["runs"]) == 5
+    assert all("fake" in r["task_name"] for r in body["runs"])
+
+
+@pytest.mark.asyncio
+async def test_runs_filter_by_task_escapes_underscore(client, _seed_runs):
+    # The literal "_" in "task_3" must match one row, not act as a
+    # single-char wildcard matching every task_N.
+    resp = await client.get("/api/system/activity/runs?task=task_3")
+    body = await resp.get_json()
+    assert len(body["runs"]) == 1
+    assert body["runs"][0]["task_name"].endswith("task_3")
+
+
 @pytest.mark.asyncio
 async def test_runs_keyset_cursor(client, _seed_runs):
     page1 = await (await client.get("/api/system/activity/runs?limit=2")).get_json()