diff --git a/DEVY.md b/DEVY.md
index 1522bb1..52168ae 100644
--- a/DEVY.md
+++ b/DEVY.md
@@ -2,10 +2,6 @@ Cost-Analytics Dashboard für OpenClaw API-Nutzung. Importiert Session-JSONL-Fil
 
 **Stack:** .NET 10 Minimal API + Vanilla JS SPA + SQLite | **Port:** 18684
 
-## Pfad
-
-`/home/node/.openclaw/workspace/projects/token-analytics`
-
 ## Deployment
 
 ```bash
@@ -14,8 +10,6 @@ bash deploy.sh
 
 ## Notizen
 
-- Siehe ARCHITECTURE.md für technische Details
-- Siehe IDEAS.md für offene Ideen
 - Config wird server-seitig in `dashboard-config.json` gespeichert (nicht in Git)
 - JSONL-Import ist Full-Scan (robust gegen OpenClaw Session-Kompaktierung)
 - Balkenanzahl dynamisch: Vielfache von 28, basierend auf Viewport und `minBarWidth`
\ No newline at end of file
diff --git a/wwwroot/app.js b/wwwroot/app.js
index cbd9d57..10b7e7e 100644
--- a/wwwroot/app.js
+++ b/wwwroot/app.js
@@ -216,6 +216,7 @@ function renderBucketChart(buckets, bucketMinutes) {
   // Determine week boundaries for grouping
   let lastWeekId = null;
   let lastDayId = null;
+  let lastSixHourId = null;
 
   for (let i = 0; i < getBarCount(); i++) {
     const b = bucketMap[i];
@@ -236,12 +237,18 @@ function renderBucketChart(buckets, bucketMinutes) {
     const isNewWeek = lastWeekId !== null && weekId !== lastWeekId;
     const showDaySep = ZOOM_LEVELS[zoomIndex].weeks === 1;
     const isNewDay = showDaySep && lastDayId !== null && dayId !== lastDayId && !isNewWeek;
-    if (isNewWeek || isNewDay) {
+    // 3h quarter separators for 1-day view (absolute, anchored to anchorHour)
+    const isOneDayView = ZOOM_LEVELS[zoomIndex].days === 1;
+    const absHour = new Date(bucketStart);
+    const sixHourId = isOneDayView ? Math.floor((absHour.getHours() - CFG.anchorHour + 24) % 24 / 3) : null;
+    const isNewQuarter = isOneDayView && lastSixHourId !== null && sixHourId !== lastSixHourId && !isNewWeek && !isNewDay;
+    if (isNewWeek || isNewDay || isNewQuarter) {
       const spacer = document.createElement('div');
       spacer.className = isNewWeek ? 'bar-spacer' : 'bar-spacer day-spacer';
       chart.appendChild(spacer);
       labels.appendChild(Object.assign(document.createElement('div'), { className: 'chart-label bar-spacer' }));
     }
+    if (isOneDayView) lastSixHourId = sixHourId;
     lastWeekId = weekId;
     lastDayId = dayId;
 
@@ -365,20 +372,9 @@ function renderChainBlocks(chains) {
       if (entryMode) {
         openModal(null, null, c.chainId);
       } else if (zoomIndex >= ZOOM_LEVELS.length - 1) {
-        // Already at max zoom (1 Tag) - enter entry mode for the bucket containing this chain
+        // Already at max zoom (1 Tag) - enter entry mode for 3h window containing this chain
         const chainMid = new Date((new Date(c.first).getTime() + new Date(c.last).getTime()) / 2);
-        const totalMinutes = (viewTo - viewFrom) / 60000;
-        const bucketMinutes = Math.max(1, Math.round(totalMinutes / getBarCount()));
-        const bucketMs = bucketMinutes * 60000;
-        const elapsed = chainMid - viewFrom;
-        const bucketIndex = Math.floor(elapsed / bucketMs);
-        const bucketStart = new Date(viewFrom.getTime() + bucketIndex * bucketMs);
-        const bucketEnd = new Date(bucketStart.getTime() + bucketMs);
-        zoomStack.push({ from: new Date(viewFrom), to: new Date(viewTo), zoom: zoomIndex, entry: false });
-        viewFrom = bucketStart;
-        viewTo = bucketEnd;
-        entryMode = true;
-        loadView();
+        enterEntryMode(chainMid, chainMid);
       } else {
         const chainMid = new Date((new Date(c.first).getTime() + new Date(c.last).getTime()) / 2);
         zoomStack.push({ from: new Date(viewFrom), to: new Date(viewTo), zoom: zoomIndex, entry: false });
@@ -497,8 +493,16 @@ function zoomInto(clickStart, clickEnd) {
 
 function enterEntryMode(bucketStart, bucketEnd) {
   zoomStack.push({ from: new Date(viewFrom), to: new Date(viewTo), zoom: zoomIndex, entry: false });
-  viewFrom = bucketStart;
-  viewTo   = bucketEnd;
+  // Snap to 3-hour window containing the clicked bucket (use bucketStart to avoid boundary drift)
+  const THREE_H = 3 * 3600000;
+  // Align to 3h slots starting at anchorHour
+  const dayStart = new Date(bucketStart);
+  dayStart.setHours(CFG.anchorHour, 0, 0, 0);
+  if (dayStart > bucketStart) dayStart.setDate(dayStart.getDate() - 1);
+  const elapsed = bucketStart.getTime() - dayStart.getTime();
+  const slotIdx = Math.floor(elapsed / THREE_H);
+  viewFrom = new Date(dayStart.getTime() + slotIdx * THREE_H);
+  viewTo   = new Date(viewFrom.getTime() + THREE_H);
   entryMode = true;
   loadView();
 }