anchor-based zoom levels, week separators in chart, UI polish

Program.cs

@@ -15,6 +15,14 @@ var app = builder.Build();
 app.UseDefaultFiles();
 app.UseStaticFiles();
 
+// GET /api/settings
+app.MapGet("/api/settings", (IConfiguration config) =>
+{
+    var anchorDay = int.TryParse(config["AnchorDay"], out var d) ? d : 4;  // 0=Sun, 4=Thu
+    var anchorHour = int.TryParse(config["AnchorHour"], out var h) ? h : 23;
+    return Results.Ok(new { anchorDay, anchorHour });
+});
+
 // GET /api/cost-buckets?from=&to=&bucketMinutes=
 // Returns N buckets of aggregated cost
 app.MapGet("/api/cost-buckets", (Func<SqliteConnection> factory, string from, string to, int bucketMinutes) =>

wwwroot/app.js

@@ -1,15 +1,18 @@
 const $ = id => document.getElementById(id);
 
 const ZOOM_LEVELS = [
-  { name: '1 Monat',    days: 30 },
+  { name: '1 Monat',    weeks: 4 },
-  { name: '2 Wochen',   days: 14 },
+  { name: '2 Wochen',   weeks: 2 },
-  { name: '1 Woche',    days: 7  },
+  { name: '1 Woche',    weeks: 1 },
-  { name: '3 Tage',     days: 3  },
   { name: '1 Tag',      days: 1  },
   { name: '12 Stunden', days: 0.5 },
 ];
-const WEEKLY_BUDGET = 800; // $ pro Woche
+const WEEKLY_BUDGET = 500; // $ pro Woche
-const BAR_COUNT = 30;
+
+// Anchor config - loaded from /api/settings, defaults: Thursday 23:00
+let ANCHOR_DAY = 4;  // 0=Sun, 1=Mon, ..., 4=Thu
+let ANCHOR_HOUR = 23;
+const BAR_COUNT = 50;
 const CHAIN_COLORS = [
   '#4ade80','#60a5fa','#f97316','#c084fc','#f472b6',
   '#facc15','#34d399','#818cf8','#fb7185','#a78bfa',
@@ -21,6 +24,42 @@ let viewFrom, viewTo;
 let zoomStack = [];
 let entryMode = false;
 
+// Find the most recent anchor point before or at `date`
+function getLastAnchor(date) {
+  const d = new Date(date);
+  // Walk back to the anchor weekday
+  const diff = (d.getDay() - ANCHOR_DAY + 7) % 7;
+  d.setDate(d.getDate() - diff);
+  d.setHours(ANCHOR_HOUR, 0, 0, 0);
+  // If we landed in the future, go back one week
+  if (d > date) d.setDate(d.getDate() - 7);
+  return d;
+}
+
+// Get view range for a zoom level anchored to the cycle
+function getAnchoredRange(zoomIdx) {
+  const level = ZOOM_LEVELS[zoomIdx];
+  const now = new Date();
+  const anchor = getLastAnchor(now);
+
+  if (level.weeks) {
+    const from = new Date(anchor);
+    from.setDate(from.getDate() - (level.weeks - 1) * 7);
+    const to = new Date(anchor);
+    to.setDate(to.getDate() + 7);
+    return { from, to };
+  } else {
+    // Days/hours: subdivide current week, find the slot containing now
+    const weekStart = anchor;
+    const slotMs = level.days * 86400000;
+    const elapsed = now - weekStart;
+    const slotIndex = Math.floor(elapsed / slotMs);
+    const from = new Date(weekStart.getTime() + slotIndex * slotMs);
+    const to = new Date(from.getTime() + slotMs);
+    return { from, to };
+  }
+}
+
 init();
 
 async function init() {
@@ -30,10 +69,17 @@ async function init() {
   $('modal').addEventListener('click', e => { if (e.target === $('modal')) closeModal(); });
   document.addEventListener('keydown', e => { if (e.key === 'Escape') closeModal(); });
 
-  viewTo = new Date();
+  // Load anchor settings
-  viewFrom = new Date(viewTo);
+  try {
-  viewFrom.setDate(viewFrom.getDate() - ZOOM_LEVELS[0].days);
+    const settings = await api('/api/settings');
+    if (settings.anchorDay != null) ANCHOR_DAY = settings.anchorDay;
+    if (settings.anchorHour != null) ANCHOR_HOUR = settings.anchorHour;
+  } catch {}
+
   zoomIndex = 0;
+  const range = getAnchoredRange(zoomIndex);
+  viewFrom = range.from;
+  viewTo = range.to;
 
   restoreFromHash();
   await loadView();
@@ -110,6 +156,9 @@ function renderBucketChart(buckets, bucketMinutes) {
   const maxCost = Math.max(...buckets.map(b => b.cost), 0.001);
   const isMaxZoom = zoomIndex >= ZOOM_LEVELS.length - 1;
 
+  // Determine week boundaries for grouping
+  let lastWeekId = null;
+
   for (let i = 0; i < BAR_COUNT; i++) {
     const b = bucketMap[i];
     const cost = b ? b.cost : 0;
@@ -119,6 +168,17 @@ function renderBucketChart(buckets, bucketMinutes) {
     const bucketStart = new Date(viewFrom.getTime() + i * bucketMinutes * 60000);
     const bucketEnd   = new Date(viewFrom.getTime() + (i + 1) * bucketMinutes * 60000);
 
+    // Check if this bucket crosses into a new week
+    const weekAnchor = getLastAnchor(bucketStart);
+    const weekId = weekAnchor.getTime();
+    if (lastWeekId !== null && weekId !== lastWeekId) {
+      const spacer = document.createElement('div');
+      spacer.className = 'bar-spacer';
+      chart.appendChild(spacer);
+      labels.appendChild(Object.assign(document.createElement('div'), { className: 'chart-label bar-spacer' }));
+    }
+    lastWeekId = weekId;
+
     const wrapper = document.createElement('div');
     wrapper.className = 'bar-wrapper';
     wrapper.innerHTML = `
@@ -171,7 +231,7 @@ function renderEntryChart(entries) {
 
     if (ci > 0) {
       const spacer = document.createElement('div');
-      spacer.className = 'bar-spacer';
+      spacer.className = 'bar-spacer chain-spacer';
       chart.appendChild(spacer);
       labels.appendChild(Object.assign(document.createElement('div'), { className: 'chart-label bar-spacer' }));
     }
@@ -309,9 +369,21 @@ function zoomInto(clickStart, clickEnd) {
   zoomStack.push({ from: new Date(viewFrom), to: new Date(viewTo), zoom: zoomIndex, entry: false });
   const nextLevel = ZOOM_LEVELS[zoomIndex + 1];
   const clickMid = new Date((clickStart.getTime() + clickEnd.getTime()) / 2);
-  const halfMs = (nextLevel.days * 86400000) / 2;
+
-  viewFrom = new Date(clickMid.getTime() - halfMs);
+  if (nextLevel.weeks) {
-  viewTo   = new Date(clickMid.getTime() + halfMs);
+    // Anchor-based: find the week-aligned range containing clickMid
+    const anchor = getLastAnchor(clickMid);
+    viewFrom = anchor;
+    viewTo = new Date(anchor.getTime() + nextLevel.weeks * 7 * 86400000);
+  } else {
+    // Day/hour slots within the parent range
+    const slotMs = nextLevel.days * 86400000;
+    const elapsed = clickMid - viewFrom;
+    const slotIndex = Math.floor(elapsed / slotMs);
+    viewFrom = new Date(viewFrom.getTime() + slotIndex * slotMs);
+    viewTo = new Date(viewFrom.getTime() + slotMs);
+  }
+
   zoomIndex++;
   entryMode = false;
   loadView();
@@ -334,11 +406,11 @@ function zoomOut() {
     entryMode = prev.entry;
   } else {
     // Reset to default view
-    viewTo = new Date();
-    viewFrom = new Date(viewTo);
-    viewFrom.setDate(viewFrom.getDate() - ZOOM_LEVELS[0].days);
     zoomIndex = 0;
     entryMode = false;
+    const range = getAnchoredRange(zoomIndex);
+    viewFrom = range.from;
+    viewTo = range.to;
   }
   loadView();
 }

wwwroot/style.css

@@ -119,7 +119,22 @@ header h1 { font-size: 1.1rem; font-weight: 600; color: var(--accent); }
 }
 
 .bar-in-chain { gap: 0; }
-.bar-spacer { width: 10px; min-width: 10px; flex: 0 0 10px; }
+.bar-spacer {
+  width: 12px; min-width: 12px; flex: 0 0 12px;
+  position: relative;
+  align-self: stretch;
+}
+.bar-spacer::before {
+  content: '';
+  position: absolute;
+  left: 50%;
+  top: 0;
+  bottom: 0;
+  width: 1px;
+  background: var(--muted);
+}
+#chart-labels .bar-spacer { display: none; }
+.bar-spacer.chain-spacer::before { display: none; }
 
 .bar {
   width: 100%;