feat(incidents): incident timeline visualizer + fix entry lookup using wrong DB path

Adds IncidentTimeline.vue — a pure SVG time-axis component rendered inside the
incident detail drawer when entries are present:
- Horizontal strip scaled to incident window (preserveAspectRatio=none)
- Event ticks colored by severity, height proportional to severity level
- 50-bin density shading shows burst periods as blue bands
- Gap markers (dashed lines) for silence > 10% of window or > 60s
- Hover tooltip showing nearest entry's severity, time, and truncated text
- Click-to-scroll: clicking a tick highlights and scrolls to its entry in the list below
- Legend showing only severity levels present in the incident

Also fixes a pre-existing bug: get_incident_endpoint and both build_bundle callers
were passing INCIDENTS_DB_PATH to get_incident_entries/build_bundle, causing all
incident entry lookups to silently search the empty incidents DB instead of the
main log DB. This made all incident detail views show "No log entries found".

Closes: #57

app/rest.py

@@ -1011,7 +1011,7 @@ def get_incident_endpoint(incident_id: str) -> dict:
     incident = get_incident(INCIDENTS_DB_PATH, incident_id)
     if not incident:
         raise HTTPException(status_code=404, detail="Incident not found")
-    entries = get_incident_entries(INCIDENTS_DB_PATH, incident)
+    entries = get_incident_entries(DB_PATH, incident)
     return {
         **dataclasses.asdict(incident),
         "entries": [dataclasses.asdict(e) for e in entries],
@@ -1030,7 +1030,7 @@ def get_incident_bundle(incident_id: str, sanitize: bool = False) -> dict:
     incident = get_incident(INCIDENTS_DB_PATH, incident_id)
     if not incident:
         raise HTTPException(status_code=404, detail="Incident not found")
-    bundle = build_bundle(INCIDENTS_DB_PATH, incident, source_host=SOURCE_HOST, sanitize=sanitize)
+    bundle = build_bundle(DB_PATH, incident, source_host=SOURCE_HOST, sanitize=sanitize)
     record_sent_bundle(INCIDENTS_DB_PATH, incident_id, bundle, sanitized=sanitize)
     return bundle
 
@@ -1048,7 +1048,7 @@ def send_incident_bundle(incident_id: str, sanitize: bool = False) -> dict:
     incident = get_incident(INCIDENTS_DB_PATH, incident_id)
     if not incident:
         raise HTTPException(status_code=404, detail="Incident not found")
-    bundle = build_bundle(INCIDENTS_DB_PATH, incident, source_host=SOURCE_HOST, sanitize=sanitize)
+    bundle = build_bundle(DB_PATH, incident, source_host=SOURCE_HOST, sanitize=sanitize)
     record_sent_bundle(INCIDENTS_DB_PATH, incident_id, bundle, sanitized=sanitize)
     payload = json.dumps(bundle).encode()
     req = urllib.request.Request(

web/src/components/IncidentTimeline.vue

@@ -0,0 +1,290 @@
+<template>
+  <div class="incident-timeline" v-if="hasData">
+    <!-- Axis labels -->
+    <div class="flex justify-between text-xs text-text-dim mb-1 px-1 font-mono">
+      <span>{{ startLabel }}</span>
+      <span class="text-center text-text-dim opacity-60 text-[10px]">{{ totalLabel }}</span>
+      <span>{{ endLabel }}</span>
+    </div>
+
+    <!-- SVG strip -->
+    <div class="relative rounded border border-surface-border bg-surface overflow-hidden" style="height:64px">
+      <svg
+        :viewBox="`0 0 ${W} ${H}`"
+        preserveAspectRatio="none"
+        class="w-full h-full"
+        @mousemove="onMouseMove"
+        @mouseleave="tooltip = null"
+      >
+        <!-- Burst density bands (bin shading) -->
+        <rect
+          v-for="(bin, i) in densityBins"
+          :key="`bin-${i}`"
+          :x="bin.x"
+          :width="bin.w"
+          y="0"
+          :height="H"
+          :fill="bin.fill"
+          :fill-opacity="bin.opacity"
+        />
+
+        <!-- Gap markers -->
+        <line
+          v-for="(gap, i) in gapMarkers"
+          :key="`gap-${i}`"
+          :x1="gap.x"
+          :x2="gap.x"
+          y1="4"
+          :y2="H - 4"
+          stroke="var(--color-text-dim)"
+          stroke-width="1"
+          stroke-dasharray="3,3"
+          opacity="0.5"
+        />
+
+        <!-- Event ticks -->
+        <rect
+          v-for="(ev, i) in eventTicks"
+          :key="`ev-${i}`"
+          :x="ev.x - 1"
+          width="2"
+          :y="ev.y"
+          :height="ev.h"
+          :fill="ev.color"
+          :fill-opacity="ev.alpha"
+          class="cursor-pointer"
+          @click="$emit('select-entry', ev.index)"
+        />
+
+        <!-- Axis baseline -->
+        <line
+          x1="0" :x2="W" :y1="H - 6" :y2="H - 6"
+          stroke="var(--color-surface-border)"
+          stroke-width="1"
+        />
+      </svg>
+
+      <!-- Hover tooltip -->
+      <div
+        v-if="tooltip"
+        class="absolute pointer-events-none z-10 bg-surface-raised border border-surface-border rounded px-2 py-1 text-xs text-text-primary shadow-md max-w-xs truncate"
+        :style="{ left: `${tooltip.px}px`, top: '4px', transform: tooltip.flip ? 'translateX(-100%)' : '' }"
+      >
+        <span :class="severityClass(tooltip.severity)" class="mr-1 font-bold">{{ tooltip.severity }}</span>
+        <span class="text-text-dim mr-1">{{ tooltip.time }}</span>
+        <span class="text-text-muted">{{ tooltip.text }}</span>
+      </div>
+    </div>
+
+    <!-- Legend -->
+    <div class="flex gap-3 mt-1.5 text-[10px] text-text-dim px-1">
+      <span
+        v-for="sev in legendItems"
+        :key="sev.label"
+        class="flex items-center gap-1"
+      >
+        <span class="inline-block w-2 h-2 rounded-sm" :style="{ background: sev.color }"></span>
+        {{ sev.label }}
+      </span>
+      <span class="ml-auto">{{ entries.length }} events</span>
+    </div>
+  </div>
+</template>
+
+<script setup lang="ts">
+import { computed, ref } from 'vue'
+
+interface Entry {
+  entry_id: string
+  source_id: string
+  timestamp_iso: string | null
+  severity: string | null
+  text: string
+}
+
+const props = defineProps<{
+  entries: Entry[]
+  startedAt?: string | null
+  endedAt?: string | null
+}>()
+
+defineEmits<{
+  'select-entry': [index: number]
+}>()
+
+// SVG logical dimensions
+const W = 1000
+const H = 64
+
+// ── colour map ─────────────────────────────────────────────────────────────
+const SEV_COLORS: Record<string, string> = {
+  DEBUG:    'var(--color-sev-debug)',
+  INFO:     'var(--color-sev-info)',
+  WARN:     'var(--color-sev-warn)',
+  WARNING:  'var(--color-sev-warn)',
+  ERROR:    'var(--color-sev-error)',
+  CRITICAL: 'var(--color-sev-critical)',
+}
+
+function sevColor(sev: string | null): string {
+  return SEV_COLORS[(sev ?? '').toUpperCase()] ?? 'var(--color-text-dim)'
+}
+
+// ── time range ──────────────────────────────────────────────────────────────
+const timed = computed(() =>
+  props.entries
+    .filter(e => e.timestamp_iso)
+    .map(e => ({ ...e, ms: new Date(e.timestamp_iso!).getTime() }))
+    .sort((a, b) => a.ms - b.ms)
+)
+
+const tMin = computed(() => {
+  if (props.startedAt) return new Date(props.startedAt).getTime()
+  return timed.value[0]?.ms ?? Date.now()
+})
+
+const tMax = computed(() => {
+  if (props.endedAt) return new Date(props.endedAt).getTime()
+  const last = timed.value[timed.value.length - 1]?.ms ?? Date.now()
+  return Math.max(last, tMin.value + 1000) // at least 1s span
+})
+
+const span = computed(() => Math.max(tMax.value - tMin.value, 1))
+
+function xOf(ms: number): number {
+  return ((ms - tMin.value) / span.value) * W
+}
+
+const hasData = computed(() => timed.value.length > 0)
+
+// ── axis labels ─────────────────────────────────────────────────────────────
+function fmtTs(ms: number): string {
+  return new Date(ms).toLocaleTimeString(undefined, {
+    hour: '2-digit', minute: '2-digit', second: '2-digit',
+  })
+}
+
+function fmtDuration(ms: number): string {
+  const s = Math.round(ms / 1000)
+  if (s < 60) return `${s}s`
+  if (s < 3600) return `${Math.floor(s / 60)}m ${s % 60}s`
+  return `${Math.floor(s / 3600)}h ${Math.floor((s % 3600) / 60)}m`
+}
+
+const startLabel = computed(() => fmtTs(tMin.value))
+const endLabel   = computed(() => fmtTs(tMax.value))
+const totalLabel = computed(() => fmtDuration(span.value))
+
+// ── density bins (burst shading) ────────────────────────────────────────────
+const NUM_BINS = 50
+
+const densityBins = computed(() => {
+  const binW = span.value / NUM_BINS
+  const counts = new Array<number>(NUM_BINS).fill(0)
+  for (const e of timed.value) {
+    const idx = Math.min(Math.floor((e.ms - tMin.value) / binW), NUM_BINS - 1)
+    counts[idx] = (counts[idx] ?? 0) + 1
+  }
+  const maxCount = Math.max(...counts, 1)
+  return counts.map((count, i) => ({
+    x: (i / NUM_BINS) * W,
+    w: W / NUM_BINS + 0.5,
+    fill: count > 0 ? 'var(--color-accent)' : 'transparent',
+    opacity: count > 0 ? Math.min(0.08 + (count / maxCount) * 0.25, 0.33) : 0,
+  }))
+})
+
+// ── gap markers (silence periods >10% of span or >60s) ─────────────────────
+const gapMarkers = computed(() => {
+  if (timed.value.length < 2) return []
+  const minGapMs = Math.max(span.value * 0.1, 60_000)
+  const markers: { x: number }[] = []
+  for (let i = 1; i < timed.value.length; i++) {
+    const prev = timed.value[i - 1]!
+    const curr = timed.value[i]!
+    const gap = curr.ms - prev.ms
+    if (gap >= minGapMs) {
+      markers.push({ x: xOf(prev.ms + gap / 2) })
+    }
+  }
+  return markers
+})
+
+// ── event ticks ─────────────────────────────────────────────────────────────
+const SEV_HEIGHT: Record<string, number> = {
+  DEBUG: 16, INFO: 24, WARN: 32, WARNING: 32, ERROR: 44, CRITICAL: 52,
+}
+
+const eventTicks = computed(() =>
+  timed.value.map((e, i) => {
+    const sevKey = (e.severity ?? '').toUpperCase()
+    const h = SEV_HEIGHT[sevKey] ?? 24
+    return {
+      index: i,
+      x: xOf(e.ms),
+      y: H - 6 - h,
+      h,
+      color: sevColor(e.severity),
+      alpha: 0.85,
+    }
+  })
+)
+
+// ── legend items (only severities present in this incident) ─────────────────
+const legendItems = computed(() => {
+  const seen = new Set(timed.value.map(e => (e.severity ?? 'UNKNOWN').toUpperCase()))
+  return (['CRITICAL', 'ERROR', 'WARN', 'INFO', 'DEBUG'] as const)
+    .filter(s => seen.has(s))
+    .map(s => ({ label: s, color: sevColor(s) }))
+})
+
+// ── hover tooltip ────────────────────────────────────────────────────────────
+interface Tooltip {
+  px: number
+  flip: boolean
+  severity: string | null
+  time: string
+  text: string
+}
+
+const tooltip = ref<Tooltip | null>(null)
+
+function onMouseMove(e: MouseEvent) {
+  const svg = e.currentTarget as SVGElement
+  const rect = svg.getBoundingClientRect()
+  const relX = (e.clientX - rect.left) / rect.width  // 0..1
+  const ms = tMin.value + relX * span.value
+
+  // Find nearest entry
+  let nearest = timed.value[0]
+  let nearestDist = Infinity
+  for (const entry of timed.value) {
+    const d = Math.abs(entry.ms - ms)
+    if (d < nearestDist) { nearestDist = d; nearest = entry }
+  }
+  if (!nearest) return
+
+  // Only show if within ~3% of span
+  if (nearestDist > span.value * 0.03 + 5000) {
+    tooltip.value = null
+    return
+  }
+
+  const px = e.clientX - rect.left
+  tooltip.value = {
+    px,
+    flip: px > rect.width * 0.7,
+    severity: nearest.severity,
+    time: fmtTs(nearest.ms),
+    text: nearest.text.slice(0, 120),
+  }
+}
+
+function severityClass(sev: string | null): string {
+  return {
+    ERROR: 'text-sev-error', CRITICAL: 'text-sev-critical',
+    WARN: 'text-sev-warn', WARNING: 'text-sev-warn',
+    INFO: 'text-sev-info', DEBUG: 'text-text-dim',
+  }[(sev ?? '').toUpperCase()] ?? 'text-text-dim'
+}
+</script>

web/src/views/IncidentsView.vue

@@ -115,12 +115,25 @@
       </div>
 
       <div v-else>
-        <p class="text-text-dim text-xs mb-3">{{ selectedEntries.length }} entries in window</p>
+        <!-- Timeline visualizer -->
-        <div class="space-y-1 max-h-96 overflow-y-auto">
+        <IncidentTimeline
+          class="mb-4"
+          :entries="selectedEntries"
+          :started-at="selected.started_at"
+          :ended-at="selected.ended_at"
+          @select-entry="scrollToEntry"
+        />
+
+        <div
+          id="incident-entries"
+          class="space-y-1 max-h-96 overflow-y-auto"
+        >
           <div
-            v-for="entry in selectedEntries"
+            v-for="(entry, idx) in selectedEntries"
             :key="entry.entry_id"
-            class="font-mono text-xs py-1 px-2 rounded bg-surface-raised border border-surface-border"
+            :id="`incident-entry-${idx}`"
+            class="font-mono text-xs py-1 px-2 rounded bg-surface-raised border border-surface-border transition-colors"
+            :class="{ 'ring-1 ring-accent': highlightIdx === idx }"
           >
             <span class="text-text-dim mr-2">{{ shortTs(entry.timestamp_iso) }}</span>
             <span :class="['mr-2', severityTextClass(entry.severity)]">{{ entry.severity || '?' }}</span>
@@ -138,6 +151,7 @@
 <script setup lang="ts">
 import { ref, onMounted } from 'vue'
 import { RouterLink } from 'vue-router'
+import IncidentTimeline from '@/components/IncidentTimeline.vue'
 
 const BASE = import.meta.env.BASE_URL.replace(/\/$/, '')
 
@@ -224,6 +238,16 @@ async function sendBundle(id: string) {
   }
 }
 
+// ── timeline interaction ──────────────────────────────────────
+const highlightIdx = ref<number | null>(null)
+
+function scrollToEntry(idx: number) {
+  highlightIdx.value = idx
+  const el = document.getElementById(`incident-entry-${idx}`)
+  el?.scrollIntoView({ block: 'nearest', behavior: 'smooth' })
+  setTimeout(() => { highlightIdx.value = null }, 1500)
+}
+
 // ── helpers ───────────────────────────────────────────────────
 function severityStyle(sev: string): Record<string, string> {
   const k = sev?.toLowerCase() ?? 'low'