diff --git a/components/SystemMetricsChart.vue b/components/SystemMetricsChart.vue
index 5cb0719..93a584c 100644
--- a/components/SystemMetricsChart.vue
+++ b/components/SystemMetricsChart.vue
@@ -3,26 +3,47 @@
     <div class="card-header">
       <div>
         <h2 class="card-title">Historique systeme</h2>
-        <p class="card-copy">CPU, RAM et debit reseau sur les derniers releves</p>
+        <p class="card-copy">CPU, RAM et debit reseau avec cache journalier local</p>
       </div>
 
-      <div class="toggle-group" role="radiogroup" aria-label="Metrique affichee">
-        <label
-          v-for="option in options"
-          :key="option.value"
-          class="toggle-pill"
-          :class="{ 'toggle-pill-active': selectedMetric === option.value }"
-        >
-          <input
-            v-model="selectedMetric"
-            type="radio"
-            name="system-metric"
-            class="sr-only"
-            :value="option.value"
+      <div class="controls">
+        <div class="toggle-group" role="radiogroup" aria-label="Metrique affichee">
+          <label
+            v-for="option in options"
+            :key="option.value"
+            class="toggle-pill"
+            :class="{ 'toggle-pill-active': selectedMetric === option.value }"
           >
-          <span class="toggle-dot" :style="{ backgroundColor: option.color }" />
-          <span>{{ option.label }}</span>
-        </label>
+            <input
+              v-model="selectedMetric"
+              type="radio"
+              name="system-metric"
+              class="sr-only"
+              :value="option.value"
+            >
+            <span class="toggle-dot" :style="{ backgroundColor: option.color }" />
+            <span>{{ option.label }}</span>
+          </label>
+        </div>
+
+        <div class="history-toolbar">
+          <label class="window-select">
+            <span>Fenetre</span>
+            <select v-model="selectedWindow">
+              <option
+                v-for="windowOption in windowOptions"
+                :key="windowOption.value"
+                :value="windowOption.value"
+              >
+                {{ windowOption.label }}
+              </option>
+            </select>
+          </label>
+
+          <button type="button" class="clear-btn" @click="clearHistory">
+            Vider le cache
+          </button>
+        </div>
       </div>
     </div>
 
@@ -44,6 +65,10 @@
             <span class="meta-label">Echelle</span>
             <strong class="meta-value">{{ scaleLabel }}</strong>
           </div>
+          <div>
+            <span class="meta-label">Periode</span>
+            <strong class="meta-value">{{ activeWindowLabel }}</strong>
+          </div>
         </div>
 
         <svg
@@ -53,14 +78,55 @@
           aria-label="Graphique des ressources"
         >
           <line
-            v-for="line in gridLines"
-            :key="line"
-            x1="0"
-            :y1="line"
-            x2="960"
-            :y2="line"
+            :x1="chartLeft"
+            :y1="chartBottom"
+            :x2="chartRight"
+            :y2="chartBottom"
+            class="axis-line"
+          />
+          <line
+            :x1="chartLeft"
+            :y1="chartTop"
+            :x2="chartLeft"
+            :y2="chartBottom"
+            class="axis-line"
+          />
+          <line
+            v-for="line in yAxisTicks"
+            :key="`grid-${line.y}`"
+            :x1="chartLeft"
+            :y1="line.y"
+            :x2="chartRight"
+            :y2="line.y"
             class="grid-line"
           />
+          <text
+            v-for="line in yAxisTicks"
+            :key="`y-label-${line.y}`"
+            :x="chartLeft - 12"
+            :y="line.y + 4"
+            class="axis-label axis-label-y"
+          >
+            {{ line.label }}
+          </text>
+          <line
+            v-for="tick in xAxisTicks"
+            :key="`x-grid-${tick.x}`"
+            :x1="tick.x"
+            :y1="chartTop"
+            :x2="tick.x"
+            :y2="chartBottom"
+            class="grid-line grid-line-vertical"
+          />
+          <text
+            v-for="tick in xAxisTicks"
+            :key="`x-label-${tick.x}`"
+            :x="tick.x"
+            :y="304"
+            class="axis-label axis-label-x"
+          >
+            {{ tick.label }}
+          </text>
           <polyline
             :points="polylinePoints"
             class="chart-line"
@@ -73,35 +139,140 @@
 </template>
 
 <script setup lang="ts">
-import {computed, ref, watch} from "vue"
-import { SystemMetrics } from "~/types/system";
+import { computed, onMounted, ref, watch } from "vue"
+import type { SystemMetrics } from "~/types/system"
 
 type MetricKey = "cpu" | "ram" | "incoming" | "outgoing"
+type WindowKey = "day" | "hour" | "30m" | "5m" | "1m" | "30s"
 
 type HistoryPoint = {
-  sampledAt: string
+  sampledAt: number
   cpu: number
   ram: number
   incoming: number
   outgoing: number
 }
 
+const HISTORY_STORAGE_KEY = "supervisor-system-history"
+
 const props = defineProps<{
   metrics: SystemMetrics | null
   loading: boolean
 }>()
 
 const selectedMetric = ref<MetricKey>("ram")
+const selectedWindow = ref<WindowKey>("hour")
 const history = ref<HistoryPoint[]>([])
-const maxPoints = 40
 
-const options: Array<{value: MetricKey; label: string; color: string}> = [
-  {value: "cpu", label: "CPU", color: "#5aa9ff"},
-  {value: "ram", label: "RAM", color: "#31c48d"},
-  {value: "incoming", label: "Entrant", color: "#f59e0b"},
-  {value: "outgoing", label: "Sortant", color: "#ef4444"}
+const options: Array<{ value: MetricKey; label: string; color: string }> = [
+  { value: "cpu", label: "CPU", color: "#5aa9ff" },
+  { value: "ram", label: "RAM", color: "#31c48d" },
+  { value: "incoming", label: "Entrant", color: "#f59e0b" },
+  { value: "outgoing", label: "Sortant", color: "#ef4444" }
 ]
 
+const windowOptions: Array<{ value: WindowKey; label: string; durationMs: number | null }> = [
+  { value: "day", label: "Journee", durationMs: null },
+  { value: "hour", label: "1 h", durationMs: 60 * 60 * 1000 },
+  { value: "30m", label: "30 min", durationMs: 30 * 60 * 1000 },
+  { value: "5m", label: "5 min", durationMs: 5 * 60 * 1000 },
+  { value: "1m", label: "1 min", durationMs: 60 * 1000 },
+  { value: "30s", label: "30 s", durationMs: 30 * 1000 }
+]
+
+const getStartOfToday = (timestamp: number) => {
+  const date = new Date(timestamp)
+  date.setHours(0, 0, 0, 0)
+  return date.getTime()
+}
+
+const normalizeHistory = (points: HistoryPoint[]) => {
+  if (points.length === 0) {
+    return []
+  }
+
+  const startOfToday = getStartOfToday(Date.now())
+
+  return points
+    .filter((point) => point.sampledAt >= startOfToday)
+    .sort((left, right) => left.sampledAt - right.sampledAt)
+}
+
+const persistHistory = () => {
+  if (!import.meta.client) {
+    return
+  }
+
+  localStorage.setItem(HISTORY_STORAGE_KEY, JSON.stringify(history.value))
+}
+
+const appendHistoryPoint = (metrics: SystemMetrics) => {
+  const sampledAt = new Date(metrics.sampledAt).getTime()
+
+  if (!Number.isFinite(sampledAt)) {
+    return
+  }
+
+  const nextPoint: HistoryPoint = {
+    sampledAt,
+    cpu: metrics.cpuPercent,
+    ram: metrics.memoryPercent,
+    incoming: metrics.incomingMbps,
+    outgoing: metrics.outgoingMbps
+  }
+
+  const previousPoint = history.value.at(-1)
+  const nextHistory = normalizeHistory(
+    previousPoint?.sampledAt === nextPoint.sampledAt
+      ? [...history.value.slice(0, -1), nextPoint]
+      : [...history.value, nextPoint]
+  )
+
+  history.value = nextHistory
+  persistHistory()
+}
+
+const clearHistory = () => {
+  history.value = []
+
+  if (!import.meta.client) {
+    return
+  }
+
+  localStorage.removeItem(HISTORY_STORAGE_KEY)
+}
+
+onMounted(() => {
+  if (!import.meta.client) {
+    return
+  }
+
+  try {
+    const rawHistory = localStorage.getItem(HISTORY_STORAGE_KEY)
+
+    if (!rawHistory) {
+      return
+    }
+
+    const parsedHistory = JSON.parse(rawHistory) as HistoryPoint[]
+    history.value = normalizeHistory(
+      parsedHistory.filter((point) => {
+        return (
+          point &&
+          Number.isFinite(point.sampledAt) &&
+          Number.isFinite(point.cpu) &&
+          Number.isFinite(point.ram) &&
+          Number.isFinite(point.incoming) &&
+          Number.isFinite(point.outgoing)
+        )
+      })
+    )
+    persistHistory()
+  } catch {
+    localStorage.removeItem(HISTORY_STORAGE_KEY)
+  }
+})
+
 watch(
   () => props.metrics?.sampledAt,
   () => {
@@ -109,25 +280,29 @@ watch(
       return
     }
 
-    history.value = [
-      ...history.value,
-      {
-        sampledAt: props.metrics.sampledAt,
-        cpu: props.metrics.cpuPercent,
-        ram: props.metrics.memoryPercent,
-        incoming: props.metrics.incomingMbps,
-        outgoing: props.metrics.outgoingMbps
-      }
-    ].slice(-maxPoints)
+    appendHistoryPoint(props.metrics)
   },
-  {immediate: true}
+  { immediate: true }
 )
 
 const activeOption = computed(() => {
   return options.find((option) => option.value === selectedMetric.value) || options[0]
 })
 
-const points = computed(() => history.value.map((point) => point[selectedMetric.value]))
+const activeWindow = computed(() => {
+  return windowOptions.find((option) => option.value === selectedWindow.value) || windowOptions[0]
+})
+
+const visibleHistory = computed(() => {
+  if (activeWindow.value.durationMs === null) {
+    return history.value
+  }
+
+  const minTimestamp = Date.now() - activeWindow.value.durationMs
+  return history.value.filter((point) => point.sampledAt >= minTimestamp)
+})
+
+const points = computed(() => visibleHistory.value.map((point) => point[selectedMetric.value]))
 
 const peakValue = computed(() => {
   return points.value.reduce((max, value) => Math.max(max, value), 0)
@@ -162,26 +337,93 @@ const scaleLabel = computed(() => {
   return formatValue(scaleMax.value, selectedMetric.value)
 })
 
-const gridLines = [40, 120, 200, 280]
+const activeWindowLabel = computed(() => activeWindow.value.label)
+
+const chartLeft = 72
+const chartRight = 936
+const chartTop = 24
+const chartBottom = 280
+const chartWidth = chartRight - chartLeft
+const chartHeight = chartBottom - chartTop
+
+const yAxisTicks = computed(() => {
+  const steps = 4
+
+  return Array.from({ length: steps + 1 }, (_, index) => {
+    const ratio = index / steps
+    const value = scaleMax.value * (1 - ratio)
+    const y = chartTop + chartHeight * ratio
+
+    return {
+      y,
+      label: formatValue(value, selectedMetric.value)
+    }
+  })
+})
+
+const formatTimeLabel = (timestamp: number) => {
+  return new Intl.DateTimeFormat("fr-FR", {
+    hour: "2-digit",
+    minute: "2-digit",
+    second: activeWindow.value.durationMs !== null && activeWindow.value.durationMs <= 5 * 60 * 1000
+      ? "2-digit"
+      : undefined
+  }).format(timestamp)
+}
+
+const xAxisTicks = computed(() => {
+  if (visibleHistory.value.length === 0) {
+    return []
+  }
+
+  if (visibleHistory.value.length === 1) {
+    return [
+      {
+        x: chartLeft,
+        label: formatTimeLabel(visibleHistory.value[0].sampledAt)
+      }
+    ]
+  }
+
+  const steps = 3
+  const firstTimestamp = visibleHistory.value[0].sampledAt
+  const lastTimestamp = visibleHistory.value.at(-1)?.sampledAt || firstTimestamp
+  const span = Math.max(1, lastTimestamp - firstTimestamp)
+
+  return Array.from({ length: steps + 1 }, (_, index) => {
+    const ratio = index / steps
+    const targetTimestamp = firstTimestamp + span * ratio
+    const closestPoint = visibleHistory.value.reduce((closest, point) => {
+      const currentDistance = Math.abs(point.sampledAt - targetTimestamp)
+      const closestDistance = Math.abs(closest.sampledAt - targetTimestamp)
+      return currentDistance < closestDistance ? point : closest
+    }, visibleHistory.value[0])
+
+    return {
+      x: chartLeft + chartWidth * ratio,
+      label: formatTimeLabel(closestPoint.sampledAt)
+    }
+  })
+})
 
 const polylinePoints = computed(() => {
   if (points.value.length === 0) {
-    return "0,280"
+    return `${chartLeft},${chartBottom}`
   }
 
   if (points.value.length === 1) {
     const normalizedValue = points.value[0] / scaleMax.value
-    const y = 280 - normalizedValue * 240
-    return `0,${y} 960,${y}`
+    const y = chartBottom - normalizedValue * chartHeight
+    return `${chartLeft},${y} ${chartRight},${y}`
   }
 
   return points.value
     .map((value, index) => {
-      const x = (index / (points.value.length - 1)) * 960
+      const x = chartLeft + (index / (points.value.length - 1)) * chartWidth
       const normalizedValue = scaleMax.value > 0 ? value / scaleMax.value : 0
-      const y = 280 - normalizedValue * 240
+      const y = chartBottom - normalizedValue * chartHeight
 
-      return `${x},${Math.max(24, Math.min(280, y))}`
+      return `${x},${Math.max(chartTop, Math.min(chartBottom, y))}`
     })
     .join(" ")
 })
@@ -222,6 +464,13 @@ const polylinePoints = computed(() => {
   letter-spacing: 0.12em;
 }
 
+.controls {
+  display: flex;
+  flex-direction: column;
+  align-items: flex-end;
+  gap: 0.75rem;
+}
+
 .toggle-group {
   display: flex;
   align-items: center;
@@ -259,6 +508,53 @@ const polylinePoints = computed(() => {
   flex-shrink: 0;
 }
 
+.history-toolbar {
+  display: flex;
+  align-items: center;
+  gap: 0.75rem;
+  flex-wrap: wrap;
+  justify-content: flex-end;
+}
+
+.window-select {
+  display: inline-flex;
+  align-items: center;
+  gap: 0.5rem;
+  font-family: var(--font-mono);
+  font-size: 0.7rem;
+  letter-spacing: 0.12em;
+  text-transform: uppercase;
+  color: rgb(var(--m-muted));
+}
+
+.window-select select {
+  border-radius: 999px;
+  border: 1px solid rgb(var(--m-accent) / 0.14);
+  background: rgb(var(--m-tertiary));
+  padding: 0.55rem 0.8rem;
+  font: inherit;
+  color: rgb(var(--m-text));
+}
+
+.clear-btn {
+  border-radius: 999px;
+  border: 1px solid rgb(var(--m-error) / 0.18);
+  background: rgb(var(--m-error) / 0.08);
+  padding: 0.55rem 0.85rem;
+  font-family: var(--font-mono);
+  font-size: 0.72rem;
+  letter-spacing: 0.12em;
+  text-transform: uppercase;
+  color: rgb(var(--m-error));
+  cursor: pointer;
+  transition: border-color 0.2s ease, background-color 0.2s ease, color 0.2s ease;
+}
+
+.clear-btn:hover {
+  border-color: rgb(var(--m-error) / 0.32);
+  background: rgb(var(--m-error) / 0.14);
+}
+
 .chart-shell {
   border-radius: 12px;
   padding: 1rem;
@@ -269,7 +565,7 @@ const polylinePoints = computed(() => {
 
 .chart-meta {
   display: grid;
-  grid-template-columns: repeat(3, minmax(0, 1fr));
+  grid-template-columns: repeat(4, minmax(0, 1fr));
   gap: 0.75rem;
   margin-bottom: 1rem;
 }
@@ -297,12 +593,35 @@ const polylinePoints = computed(() => {
   display: block;
 }
 
+.axis-line {
+  stroke: rgb(var(--m-border) / 0.55);
+  stroke-width: 1.5;
+}
+
 .grid-line {
   stroke: rgb(var(--m-border) / 0.35);
   stroke-width: 1;
   stroke-dasharray: 6 10;
 }
 
+.grid-line-vertical {
+  stroke-dasharray: 4 12;
+}
+
+.axis-label {
+  font-family: var(--font-mono);
+  font-size: 11px;
+  fill: rgb(var(--m-muted));
+}
+
+.axis-label-y {
+  text-anchor: end;
+}
+
+.axis-label-x {
+  text-anchor: middle;
+}
+
 .chart-line {
   fill: none;
   stroke-width: 4;
@@ -317,6 +636,15 @@ const polylinePoints = computed(() => {
 }
 
 @media (max-width: 820px) {
+  .controls {
+    width: 100%;
+    align-items: stretch;
+  }
+
+  .history-toolbar {
+    justify-content: space-between;
+  }
+
   .chart-meta {
     grid-template-columns: 1fr;
   }
diff --git a/components/SystemResources.vue b/components/SystemResources.vue
index 9d77cf3..a646919 100644
--- a/components/SystemResources.vue
+++ b/components/SystemResources.vue
@@ -46,7 +46,7 @@
 
 <script setup lang="ts">
 import {computed} from "vue"
-import { SystemMetrics } from "~/types/system";
+import type { SystemMetrics } from "~/types/system";
 
 const props = defineProps<{
   metrics: SystemMetrics | null
diff --git a/pages/index.vue b/pages/index.vue
index 43fbe20..646ada2 100644
--- a/pages/index.vue
+++ b/pages/index.vue
@@ -64,7 +64,7 @@
 <script setup lang="ts">
 import {computed, onMounted, ref} from "vue"
 import { apiFetch } from "~/composables/useApiAuth"
-import { SystemMetrics } from "~/types/system";
+import type { SystemMetrics } from "~/types/system";
 
 definePageMeta({layout: false})
 
diff --git a/server/api/system.get.ts b/server/api/system.get.ts
index 7ce0fb1..faa1b7e 100644
--- a/server/api/system.get.ts
+++ b/server/api/system.get.ts
@@ -1,165 +1,5 @@
-import fs from "node:fs"
-import os from "node:os"
+import { getSystemMetricsSnapshot } from "../plugins/metrics-worker"
 
-type CpuTimesSnapshot = {
-  idle: number
-  total: number
-}
-
-type NetworkSnapshot = {
-  rxBytes: number
-  txBytes: number
-  timestamp: number
-}
-
-let previousNetworkSnapshot: NetworkSnapshot | null = null
-
-function getCpuSnapshot(): CpuTimesSnapshot {
-  const cpus = os.cpus()
-
-  return cpus.reduce(
-    (snapshot, cpu) => {
-      const total = Object.values(cpu.times).reduce((sum, value) => sum + value, 0)
-
-      snapshot.idle += cpu.times.idle
-      snapshot.total += total
-
-      return snapshot
-    },
-    {idle: 0, total: 0}
-  )
-}
-
-function wait(durationMs: number) {
-  return new Promise((resolve) => {
-    setTimeout(resolve, durationMs)
-  })
-}
-
-async function getCpuUsagePercent(sampleMs: number) {
-  const start = getCpuSnapshot()
-  await wait(sampleMs)
-  const end = getCpuSnapshot()
-
-  const idleDelta = end.idle - start.idle
-  const totalDelta = end.total - start.total
-
-  if (totalDelta <= 0) {
-    return 0
-  }
-
-  return Math.max(0, Math.min(100, Math.round((1 - idleDelta / totalDelta) * 100)))
-}
-
-function getNetworkTotals() {
-  try {
-    const content = fs.readFileSync("/proc/net/dev", "utf8")
-    const totals = content
-      .split("\n")
-      .slice(2)
-      .map((line) => line.trim())
-      .filter(Boolean)
-      .reduce(
-        (accumulator, line) => {
-          const [namePart, valuesPart] = line.split(":")
-          const interfaceName = namePart?.trim()
-
-          if (!interfaceName || interfaceName === "lo" || !valuesPart) {
-            return accumulator
-          }
-
-          const values = valuesPart.trim().split(/\s+/)
-          const rxBytes = Number.parseInt(values[0] || "0", 10)
-          const txBytes = Number.parseInt(values[8] || "0", 10)
-
-          if (Number.isFinite(rxBytes)) {
-            accumulator.rxBytes += rxBytes
-          }
-
-          if (Number.isFinite(txBytes)) {
-            accumulator.txBytes += txBytes
-          }
-
-          return accumulator
-        },
-        {rxBytes: 0, txBytes: 0}
-      )
-
-    return totals
-  } catch {
-    return null
-  }
-}
-
-function getNetworkRatesMbps() {
-  const totals = getNetworkTotals()
-  const now = Date.now()
-
-  if (!totals) {
-    previousNetworkSnapshot = null
-    return {
-      incomingMbps: 0,
-      outgoingMbps: 0
-    }
-  }
-
-  const currentSnapshot: NetworkSnapshot = {
-    ...totals,
-    timestamp: now
-  }
-
-  if (!previousNetworkSnapshot) {
-    previousNetworkSnapshot = currentSnapshot
-
-    return {
-      incomingMbps: 0,
-      outgoingMbps: 0
-    }
-  }
-
-  const elapsedSeconds = (currentSnapshot.timestamp - previousNetworkSnapshot.timestamp) / 1000
-
-  if (elapsedSeconds <= 0) {
-    previousNetworkSnapshot = currentSnapshot
-
-    return {
-      incomingMbps: 0,
-      outgoingMbps: 0
-    }
-  }
-
-  const incomingMbps = Math.max(
-    0,
-    Number((((currentSnapshot.rxBytes - previousNetworkSnapshot.rxBytes) * 8) / elapsedSeconds / 1000000).toFixed(2))
-  )
-  const outgoingMbps = Math.max(
-    0,
-    Number((((currentSnapshot.txBytes - previousNetworkSnapshot.txBytes) * 8) / elapsedSeconds / 1000000).toFixed(2))
-  )
-
-  previousNetworkSnapshot = currentSnapshot
-
-  return {
-    incomingMbps,
-    outgoingMbps
-  }
-}
-
-export default defineEventHandler(async () => {
-  const totalMemory = os.totalmem()
-  const freeMemory = os.freemem()
-  const usedMemory = totalMemory - freeMemory
-  const memoryPercent = totalMemory > 0 ? Math.round((usedMemory / totalMemory) * 100) : 0
-  const cpuPercent = await getCpuUsagePercent(200)
-  const {incomingMbps, outgoingMbps} = getNetworkRatesMbps()
-
-  return {
-    cpuPercent,
-    memoryPercent,
-    totalMemory,
-    usedMemory,
-    incomingMbps,
-    outgoingMbps,
-    sampledAt: new Date().toISOString()
-  }
+export default defineEventHandler(() => {
+  return getSystemMetricsSnapshot()
 })