Remove 12h timeframe and stabilize chart wheel zoom.

Drop 12h from market chart options and storage, and avoid left-pan reload and tail refresh from resetting the viewport while zooming.

Co-authored-by: Cursor <cursoragent@cursor.com>

manual_trading_hub/static/chart.js

@@ -14,7 +14,6 @@
     "1h": 200,
     "2h": 200,
     "4h": 200,
-    "12h": 200,
     "1d": 200,
     "1w": 150,
   };
@@ -25,7 +24,6 @@
     "1h": 300,
     "2h": 300,
     "4h": 300,
-    "12h": 200,
     "1d": 200,
     "1w": 150,
   };
@@ -36,7 +34,6 @@
     "1h": 1000,
     "2h": 1000,
     "4h": 1000,
-    "12h": 1000,
     "1d": 1000,
     "1w": 500,
   };
@@ -56,7 +53,6 @@
     "1h": 60 * 60_000,
     "2h": 2 * 60 * 60_000,
     "4h": 4 * 60 * 60_000,
-    "12h": 12 * 60 * 60_000,
     "1d": 24 * 60 * 60_000,
     "1w": 7 * 24 * 60 * 60_000,
   };
@@ -67,7 +63,6 @@
     "60": "1h",
     "120": "2h",
     "240": "4h",
-    "720": "12h",
     "1440": "1d",
     "10080": "1w",
   };
@@ -81,7 +76,6 @@
     "1h": "1小时",
     "2h": "2小时",
     "4h": "4小时",
-    "12h": "12小时",
     "1d": "日线",
     "1w": "周线",
   };
@@ -179,6 +173,8 @@
   let loadingLeft = false;
   let chartDataLoading = false;
   let chartViewEpoch = 0;
+  let rangeUiTimer = null;
+  let loadOlderTimer = null;
   let priceTagTimer = null;
   let tfDigitBuf = "";
   let tfDigitTimer = null;
@@ -1954,8 +1950,7 @@
     });
 
     chart.timeScale().subscribeVisibleLogicalRangeChange(function (range) {
-      updateVisibleRangeMarkers();
-      updatePriceTag();
+      scheduleRangeUiUpdate();
       if (
         !range ||
         chartDataLoading ||
@@ -1967,9 +1962,7 @@
         return;
       }
       if (currentChartViewKey() !== lastViewKey) return;
-      if (range.from < CHART_LOAD_LEFT_THRESHOLD) {
-        void loadOlderCandles();
-      }
+      scheduleLoadOlderOnRange(range);
     });
 
     window.addEventListener("resize", function () {
@@ -2032,6 +2025,37 @@
     return range.to >= maxTo - 24;
   }
 
+  function shouldLoadOlderOnRange(range) {
+    if (!range || !lastCandles.length) return false;
+    const n = lastCandles.length;
+    const maxTo = n - 1 + RIGHT_OFFSET_BARS;
+    if (range.from >= CHART_LOAD_LEFT_THRESHOLD) return false;
+    // 缩小图表时 from 会变小，但 to 仍靠近最新 — 不应触发左拖补历史
+    if (range.to >= maxTo - 30) return false;
+    return true;
+  }
+
+  function scheduleRangeUiUpdate() {
+    if (rangeUiTimer) clearTimeout(rangeUiTimer);
+    rangeUiTimer = setTimeout(function () {
+      rangeUiTimer = null;
+      updateVisibleRangeMarkers();
+      updatePriceTag();
+    }, 120);
+  }
+
+  function scheduleLoadOlderOnRange(range) {
+    if (!shouldLoadOlderOnRange(range)) return;
+    if (loadOlderTimer) clearTimeout(loadOlderTimer);
+    loadOlderTimer = setTimeout(function () {
+      loadOlderTimer = null;
+      if (!chart) return;
+      const cur = chart.timeScale().getVisibleLogicalRange();
+      if (!shouldLoadOlderOnRange(cur)) return;
+      void loadOlderCandles();
+    }, 280);
+  }
+
   function tailVisibleLogicalRange(candleCount) {
     const n = Math.max(0, Number(candleCount) || 0);
     if (n <= 0) return null;
@@ -2196,20 +2220,18 @@
       if (epochAtStart !== chartViewEpoch) return;
       const n = lastCandles.length;
       const curRange = chart && chart.timeScale().getVisibleLogicalRange();
-      if (wasViewingTail) {
-        const tailRange = tailVisibleLogicalRange(n);
-        if (tailRange) chart.timeScale().setVisibleLogicalRange(tailRange);
-      } else if (
+      const minorTailUpdate = Math.abs(n - candleCountBefore) <= 5;
+      if (
         savedRange &&
         isVisibleRangeValidForCandles(savedRange, n) &&
-        Math.abs(n - candleCountBefore) < chartChunkLimit(tf)
+        (minorTailUpdate || !wasViewingTail)
       ) {
         chart.timeScale().setVisibleLogicalRange(savedRange);
       } else if (!isVisibleRangeValidForCandles(curRange, n)) {
         const tailRange = tailVisibleLogicalRange(n);
         if (tailRange) chart.timeScale().setVisibleLogicalRange(tailRange);
       }
-      updateVisibleRangeMarkers();
+      scheduleRangeUiUpdate();
       if (posContext) {
         updateLivePosPnl();
         refreshPosPnlFromBoard();

manual_trading_hub/static/index.html

@@ -93,7 +93,6 @@
             <option value="1h">1h</option>
             <option value="2h">2h</option>
             <option value="4h">4h</option>
-            <option value="12h">12h</option>
             <option value="1d" selected>1d</option>
             <option value="1w">1w</option>
           </select>
@@ -150,7 +149,6 @@
                 <option value="1h">1h</option>
                 <option value="2h">2h</option>
                 <option value="4h">4h</option>
-                <option value="12h">12h</option>
                 <option value="1d">1d</option>
                 <option value="1w">1w</option>
               </select>