feat: dashboard view, stats API, and composite index for query perf

- Add GET /api/stats endpoint with 24h windowed aggregation (criticals,
  errors, per-source health, recent criticals list)
- Fix timestamp format bug: strftime('%Y-%m-%dT%H:%M:%S', ...) to match
  stored ISO-8601 T-separated timestamps (datetime('now') uses space)
- Add composite index idx_ts_repeat(timestamp_iso, repeat_count) — drops
  stats query from 3.5 s to <1 ms by resolving both WHERE conditions
  from the index without table row fetches
- New DashboardView: 3 stat cards, source health table with health dots,
  diagnose-per-source button, recent criticals panel, zero-state card
- Router default / → /dashboard; Dashboard first in nav
- DiagnoseView: reads ?q= query param on mount and auto-runs; shows
  formatted LLM summary block
- LogEntryRow: expand/collapse for long entries (>200 chars or multiline)

app/ingest/pipeline.py

@@ -29,10 +29,11 @@ CREATE TABLE IF NOT EXISTS log_entries (
     matched_patterns TEXT DEFAULT '[]',
     text            TEXT NOT NULL
 );
-CREATE INDEX IF NOT EXISTS idx_source    ON log_entries(source_id);
-CREATE INDEX IF NOT EXISTS idx_timestamp ON log_entries(timestamp_iso);
-CREATE INDEX IF NOT EXISTS idx_severity  ON log_entries(severity);
-CREATE INDEX IF NOT EXISTS idx_patterns  ON log_entries(matched_patterns);
+CREATE INDEX IF NOT EXISTS idx_source      ON log_entries(source_id);
+CREATE INDEX IF NOT EXISTS idx_timestamp   ON log_entries(timestamp_iso);
+CREATE INDEX IF NOT EXISTS idx_ts_repeat   ON log_entries(timestamp_iso, repeat_count);
+CREATE INDEX IF NOT EXISTS idx_severity    ON log_entries(severity);
+CREATE INDEX IF NOT EXISTS idx_patterns    ON log_entries(matched_patterns);
 
 CREATE TABLE IF NOT EXISTS incidents (
     id          TEXT PRIMARY KEY,

app/rest.py

@@ -29,6 +29,7 @@ from app.services.search import (
     search as _search,
     list_sources as _list_sources,
     recent_source_errors as _source_errors,
+    stats_summary as _stats,
     format_results,
 )
 
@@ -161,6 +162,13 @@ def list_sources() -> dict:
     return {"sources": _list_sources(DB_PATH)}
 
 
+@router.get("/api/stats")
+def get_stats(
+    window: Annotated[int, Query(ge=1, le=168, description="Hours to look back")] = 24,
+) -> dict:
+    return _stats(DB_PATH, window_hours=window)
+
+
 @router.post("/api/incidents")
 def create_incident_endpoint(body: IncidentCreate) -> dict:
     incident = create_incident(

app/services/search.py

@@ -317,6 +317,86 @@ def list_sources(db_path: Path) -> list[dict]:
     ]
 
 
+def stats_summary(db_path: Path, window_hours: int = 24) -> dict:
+    """Return aggregate health stats for the dashboard.
+
+    Queries plain log_entries (not FTS) so it works even before the index is built.
+    """
+    conn = sqlite3.connect(str(db_path))
+    conn.execute("PRAGMA journal_mode=WAL")
+    conn.row_factory = sqlite3.Row
+
+    since_expr = f"strftime('%Y-%m-%dT%H:%M:%S', 'now', '-{window_hours} hours')"
+
+    # Overall counts in window
+    row = conn.execute(f"""
+        SELECT
+            COUNT(*) AS total,
+            SUM(CASE WHEN severity = 'CRITICAL' THEN 1 ELSE 0 END) AS criticals,
+            SUM(CASE WHEN severity IN ('ERROR','CRITICAL','EMERGENCY','ALERT') THEN 1 ELSE 0 END) AS errors
+        FROM log_entries
+        WHERE timestamp_iso >= {since_expr}
+          AND repeat_count = 1
+    """).fetchone()
+    total_24h = int(row["total"] or 0)
+    criticals_24h = int(row["criticals"] or 0)
+    errors_24h = int(row["errors"] or 0)
+
+    # Per-source breakdown
+    source_rows = conn.execute(f"""
+        SELECT
+            source_id,
+            COUNT(*) AS entry_count,
+            SUM(CASE WHEN severity IN ('ERROR','CRITICAL','EMERGENCY','ALERT') THEN 1 ELSE 0 END) AS error_count,
+            MAX(timestamp_iso) AS latest
+        FROM log_entries
+        WHERE timestamp_iso >= {since_expr}
+          AND repeat_count = 1
+        GROUP BY source_id
+        ORDER BY error_count DESC, entry_count DESC
+    """).fetchall()
+    source_health = [
+        {
+            "source_id": r["source_id"],
+            "entry_count": int(r["entry_count"]),
+            "error_count": int(r["error_count"]),
+            "latest": r["latest"],
+        }
+        for r in source_rows
+    ]
+
+    # 5 most recent critical entries
+    crit_rows = conn.execute("""
+        SELECT id as entry_id, source_id, sequence, timestamp_iso, severity,
+               repeat_count, out_of_order, matched_patterns, text, 0.0 as rank
+        FROM log_entries
+        WHERE severity = 'CRITICAL' AND repeat_count = 1
+        ORDER BY timestamp_iso DESC
+        LIMIT 5
+    """).fetchall()
+    recent_criticals = [
+        {
+            "entry_id": r["entry_id"],
+            "source_id": r["source_id"],
+            "timestamp_iso": r["timestamp_iso"],
+            "severity": r["severity"],
+            "text": r["text"],
+        }
+        for r in crit_rows
+    ]
+
+    conn.close()
+
+    return {
+        "window_hours": window_hours,
+        "total_24h": total_24h,
+        "criticals_24h": criticals_24h,
+        "errors_24h": errors_24h,
+        "source_health": source_health,
+        "recent_criticals": recent_criticals,
+    }
+
+
 def format_results(results: list[SearchResult], max_text: int = 300) -> str:
     """Format search results as readable text for LLM context."""
     if not results:

web/src/App.vue

@@ -36,6 +36,7 @@ import { RouterLink, RouterView } from 'vue-router'
 import StatusDot from '@/components/StatusDot.vue'
 
 const navLinks = [
+  { to: '/dashboard', label: 'Dashboard' },
   { to: '/search',    label: 'Search' },
   { to: '/diagnose',  label: 'Diagnose' },
   { to: '/incidents', label: 'Incidents' },

web/src/components/LogEntryRow.vue

@@ -1,7 +1,8 @@
 <template>
   <div
-    class="border-b border-surface-border px-4 py-3 hover:bg-surface-raised transition-colors cursor-default"
-    :class="{ 'border-l-2 border-l-sev-error': isHighSeverity }"
+    class="border-b border-surface-border px-4 py-3 hover:bg-surface-raised transition-colors"
+    :class="{ 'border-l-2 border-l-sev-error': isHighSeverity, 'cursor-pointer': isLong }"
+    @click="isLong && (expanded = !expanded)"
   >
     <div class="flex items-start gap-3">
       <SeverityBadge :severity="entry.severity" class="mt-0.5 shrink-0 w-16 text-center" />
@@ -14,28 +15,36 @@
             :key="p"
             class="px-1.5 py-0.5 rounded bg-accent-muted text-accent text-xs"
           >{{ p }}</span>
-          <span
-            v-if="entry.repeat_count > 1"
-            class="text-text-dim text-xs"
-          >×{{ entry.repeat_count }}</span>
+          <span v-if="entry.repeat_count > 1" class="text-text-dim text-xs">×{{ entry.repeat_count }}</span>
         </div>
-        <p class="text-text-primary text-sm whitespace-pre-wrap break-all leading-relaxed">{{ entry.text }}</p>
+        <p
+          class="text-text-primary text-sm whitespace-pre-wrap break-words leading-relaxed"
+          :class="{ 'line-clamp-3': isLong && !expanded }"
+        >{{ entry.text }}</p>
+        <button
+          v-if="isLong"
+          class="mt-1 text-text-dim hover:text-accent text-xs transition-colors"
+          @click.stop="expanded = !expanded"
+        >{{ expanded ? '▲ collapse' : '▼ expand' }}</button>
       </div>
     </div>
   </div>
 </template>
 
 <script setup lang="ts">
-import { computed } from 'vue'
+import { ref, computed } from 'vue'
 import type { LogEntry } from '@/stores/search'
 import SeverityBadge from './SeverityBadge.vue'
 
 const props = defineProps<{ entry: LogEntry }>()
+const expanded = ref(false)
 
 const isHighSeverity = computed(() =>
   ['ERROR', 'CRITICAL'].includes((props.entry.severity ?? '').toUpperCase())
 )
 
+const isLong = computed(() => props.entry.text.length > 200 || props.entry.text.includes('\n'))
+
 function formatTs(iso: string): string {
   try {
     return new Date(iso).toLocaleString(undefined, {

web/src/router/index.ts

@@ -1,4 +1,5 @@
 import { createRouter, createWebHistory } from 'vue-router'
+import DashboardView from '@/views/DashboardView.vue'
 import LogSearchView from '@/views/LogSearchView.vue'
 import DiagnoseView from '@/views/DiagnoseView.vue'
 import SourcesView from '@/views/SourcesView.vue'
@@ -7,7 +8,8 @@ import IncidentsView from '@/views/IncidentsView.vue'
 export default createRouter({
   history: createWebHistory(import.meta.env.BASE_URL),
   routes: [
-    { path: '/', redirect: '/search' },
+    { path: '/', redirect: '/dashboard' },
+    { path: '/dashboard', component: DashboardView },
     { path: '/search', component: LogSearchView },
     { path: '/diagnose', component: DiagnoseView },
     { path: '/sources', component: SourcesView },

web/src/views/DashboardView.vue

@@ -0,0 +1,201 @@
+<template>
+  <div class="p-6 max-w-5xl mx-auto space-y-8">
+
+    <!-- Stat cards -->
+    <div class="grid grid-cols-1 sm:grid-cols-3 gap-4">
+      <div class="rounded border border-surface-border bg-surface-raised p-5">
+        <p class="text-text-dim text-xs uppercase tracking-widest mb-2">Criticals (24h)</p>
+        <p class="text-3xl font-semibold tabular-nums" :class="stats?.criticals_24h ? 'text-sev-critical' : 'text-text-muted'">
+          {{ loading ? '…' : (stats?.criticals_24h ?? 0) }}
+        </p>
+      </div>
+      <div class="rounded border border-surface-border bg-surface-raised p-5">
+        <p class="text-text-dim text-xs uppercase tracking-widest mb-2">Errors (24h)</p>
+        <p class="text-3xl font-semibold tabular-nums" :class="stats?.errors_24h ? 'text-sev-error' : 'text-text-muted'">
+          {{ loading ? '…' : (stats?.errors_24h ?? 0) }}
+        </p>
+      </div>
+      <div
+        class="rounded border bg-surface-raised p-5 cursor-pointer hover:bg-surface transition-colors"
+        :class="activeIncidents > 0 ? 'border-sev-warn' : 'border-surface-border'"
+        @click="$router.push('/incidents')"
+      >
+        <p class="text-text-dim text-xs uppercase tracking-widest mb-2">Active Incidents</p>
+        <p class="text-3xl font-semibold tabular-nums" :class="activeIncidents > 0 ? 'text-sev-warn' : 'text-text-muted'">
+          {{ incidentsLoading ? '…' : activeIncidents }}
+        </p>
+      </div>
+    </div>
+
+    <!-- Source health (24h) -->
+    <div>
+      <h2 class="text-text-primary text-sm font-semibold uppercase tracking-wider mb-3">Source Health — Last 24 Hours</h2>
+
+      <div v-if="loading" class="text-text-dim text-sm py-4">Loading…</div>
+
+      <div v-else-if="!stats?.source_health?.length" class="text-text-dim text-sm py-4">
+        No log entries in the last 24 hours.
+        <RouterLink to="/sources" class="text-accent hover:underline ml-1">View all sources →</RouterLink>
+      </div>
+
+      <div v-else class="rounded border border-surface-border overflow-hidden">
+        <table class="w-full text-sm">
+          <thead class="bg-surface-raised border-b border-surface-border">
+            <tr>
+              <th class="text-left px-4 py-2.5 text-text-dim font-medium text-xs uppercase tracking-wider w-4"></th>
+              <th class="text-left px-4 py-2.5 text-text-dim font-medium text-xs uppercase tracking-wider">Source</th>
+              <th class="text-right px-4 py-2.5 text-text-dim font-medium text-xs uppercase tracking-wider">Events</th>
+              <th class="text-right px-4 py-2.5 text-text-dim font-medium text-xs uppercase tracking-wider">Errors</th>
+              <th class="text-left px-4 py-2.5 text-text-dim font-medium text-xs uppercase tracking-wider">Latest</th>
+              <th class="px-4 py-2.5"></th>
+            </tr>
+          </thead>
+          <tbody>
+            <tr
+              v-for="src in stats.source_health"
+              :key="src.source_id"
+              class="border-b border-surface-border hover:bg-surface-raised transition-colors"
+            >
+              <td class="pl-4 py-2.5">
+                <span
+                  class="inline-block w-2 h-2 rounded-full"
+                  :class="healthDot(src.error_count, src.entry_count)"
+                ></span>
+              </td>
+              <td class="px-4 py-2.5 text-accent font-mono text-xs">{{ src.source_id }}</td>
+              <td class="px-4 py-2.5 text-text-muted text-right tabular-nums">{{ src.entry_count.toLocaleString() }}</td>
+              <td class="px-4 py-2.5 text-right tabular-nums">
+                <span :class="src.error_count > 0 ? 'text-sev-error' : 'text-text-dim'">
+                  {{ src.error_count.toLocaleString() }}
+                </span>
+              </td>
+              <td class="px-4 py-2.5 text-text-dim text-xs">{{ shortTs(src.latest) }}</td>
+              <td class="px-4 py-2.5 text-right">
+                <button
+                  class="text-text-dim hover:text-accent text-xs px-2 py-1 rounded hover:bg-surface transition-colors"
+                  @click="diagnoseSource(src.source_id)"
+                >diagnose</button>
+              </td>
+            </tr>
+          </tbody>
+        </table>
+      </div>
+    </div>
+
+    <!-- Recent criticals -->
+    <div v-if="stats?.recent_criticals?.length">
+      <h2 class="text-text-primary text-sm font-semibold uppercase tracking-wider mb-3">Recent Criticals</h2>
+      <div class="rounded border border-surface-border overflow-hidden">
+        <div
+          v-for="entry in stats.recent_criticals"
+          :key="entry.entry_id"
+          class="border-b border-surface-border border-l-2 border-l-sev-critical px-4 py-3 hover:bg-surface-raised transition-colors"
+        >
+          <div class="flex items-center gap-2 mb-1 flex-wrap">
+            <span class="text-sev-critical text-xs font-semibold">CRITICAL</span>
+            <span class="text-accent text-xs">{{ entry.source_id }}</span>
+            <span v-if="entry.timestamp_iso" class="text-text-dim text-xs">{{ shortTs(entry.timestamp_iso) }}</span>
+          </div>
+          <p class="text-text-primary text-sm font-mono leading-relaxed line-clamp-2">{{ entry.text }}</p>
+        </div>
+      </div>
+    </div>
+
+    <!-- Zero state: everything clean -->
+    <div
+      v-if="!loading && stats && stats.criticals_24h === 0 && stats.errors_24h === 0 && activeIncidents === 0"
+      class="rounded border border-surface-border bg-surface-raised p-8 text-center"
+    >
+      <p class="text-text-muted text-base mb-1">No errors or criticals in the last 24 hours.</p>
+      <p class="text-text-dim text-sm">Use <RouterLink to="/search" class="text-accent hover:underline">Search</RouterLink> or <RouterLink to="/diagnose" class="text-accent hover:underline">Diagnose</RouterLink> to investigate further.</p>
+    </div>
+
+  </div>
+</template>
+
+<script setup lang="ts">
+import { ref, computed, onMounted } from 'vue'
+import { useRouter } from 'vue-router'
+
+const router = useRouter()
+const BASE = import.meta.env.BASE_URL.replace(/\/$/, '')
+
+interface SourceHealth {
+  source_id: string
+  entry_count: number
+  error_count: number
+  latest: string | null
+}
+
+interface StatsResponse {
+  window_hours: number
+  total_24h: number
+  criticals_24h: number
+  errors_24h: number
+  source_health: SourceHealth[]
+  recent_criticals: Array<{
+    entry_id: string
+    source_id: string
+    timestamp_iso: string | null
+    severity: string
+    text: string
+  }>
+}
+
+interface Incident {
+  id: string
+  ended_at: string | null
+}
+
+const stats = ref<StatsResponse | null>(null)
+const loading = ref(true)
+const incidents = ref<Incident[]>([])
+const incidentsLoading = ref(true)
+
+const activeIncidents = computed(() =>
+  incidents.value.filter(i => !i.ended_at).length
+)
+
+onMounted(async () => {
+  await Promise.all([loadStats(), loadIncidents()])
+})
+
+async function loadStats() {
+  try {
+    const res = await fetch(`${BASE}/api/stats`)
+    if (res.ok) stats.value = await res.json()
+  } finally {
+    loading.value = false
+  }
+}
+
+async function loadIncidents() {
+  try {
+    const res = await fetch(`${BASE}/api/incidents`)
+    if (res.ok) incidents.value = (await res.json()).incidents
+  } finally {
+    incidentsLoading.value = false
+  }
+}
+
+function healthDot(errors: number, total: number): string {
+  if (errors === 0) return 'bg-green-500'
+  const ratio = errors / Math.max(total, 1)
+  if (ratio > 0.1) return 'bg-sev-error'
+  return 'bg-sev-warn'
+}
+
+function diagnoseSource(sourceId: string) {
+  router.push({ path: '/diagnose', query: { q: sourceId } })
+}
+
+function shortTs(iso: string | null): string {
+  if (!iso) return '—'
+  try {
+    return new Date(iso).toLocaleString(undefined, {
+      month: 'short', day: 'numeric',
+      hour: '2-digit', minute: '2-digit',
+    })
+  } catch { return iso }
+}
+</script>

web/src/views/DiagnoseView.vue

@@ -36,6 +36,13 @@
       <div class="mb-3 text-text-dim text-xs">
         {{ entries.length }} relevant log{{ entries.length !== 1 ? 's' : '' }} — sorted chronologically
       </div>
+
+      <!-- Plain-text summary (pre-formatted for LLM context) -->
+      <div v-if="formatted" class="mb-4 rounded border border-surface-border bg-surface-raised p-4 overflow-x-auto">
+        <p class="text-text-dim text-xs uppercase tracking-widest mb-2">Formatted summary</p>
+        <pre class="text-text-muted text-xs whitespace-pre-wrap leading-relaxed font-mono">{{ formatted }}</pre>
+      </div>
+
       <div class="rounded border border-surface-border overflow-hidden">
         <LogEntryRow
           v-for="entry in entries"
@@ -54,12 +61,15 @@
 </template>
 
 <script setup lang="ts">
-import { ref } from 'vue'
+import { ref, onMounted } from 'vue'
+import { useRoute } from 'vue-router'
 import type { LogEntry } from '@/stores/search'
 import LogEntryRow from '@/components/LogEntryRow.vue'
 
+const route = useRoute()
 const symptom = ref('')
 const entries = ref<LogEntry[]>([])
+const formatted = ref('')
 const loading = ref(false)
 const error = ref<string | null>(null)
 const ranOnce = ref(false)
@@ -67,6 +77,14 @@ const lastQuery = ref('')
 
 const BASE = import.meta.env.BASE_URL.replace(/\/$/, '')
 
+onMounted(() => {
+  const q = route.query.q
+  if (typeof q === 'string' && q.trim()) {
+    symptom.value = q
+    run()
+  }
+})
+
 async function run() {
   if (!symptom.value.trim()) return
   loading.value = true
@@ -79,6 +97,7 @@ async function run() {
     if (!res.ok) throw new Error(`API returned ${res.status}`)
     const data = await res.json()
     entries.value = data.results
+    formatted.value = data.formatted ?? ''
     ranOnce.value = true
   } catch (e) {
     error.value = e instanceof Error ? e.message : String(e)