실시간 차트 오류 수정

frontend/src/utils/ChartManager.ts

@@ -356,16 +356,19 @@ export class ChartManager {
 
     this._reapplyAllPatternMarkers();
 
-    // 이전 timeScale visible range를 완전히 리셋 후 fitContent
-    // setVisibleRange → 이전 zoom 상태를 무시하고 새 데이터 범위로 명시 초기화
+    // 이전 timeScale visible range를 완전히 리셋
     const ts = this.chart.timeScale();
     if (bars.length >= 2) {
-      ts.setVisibleRange({
-        from: bars[0].time as Time,
-        to:   bars[bars.length - 1].time as Time,
-      });
+      if (bars.length < 20) {
+        ts.setVisibleLogicalRange({ from: bars.length - 200, to: bars.length + 5 });
+      } else {
+        ts.setVisibleRange({
+          from: bars[0].time as Time,
+          to:   bars[bars.length - 1].time as Time,
+        });
+        ts.fitContent();
+      }
     }
-    ts.fitContent();
   }
 
   private _createMainSeries(chartType: ChartType, t: ThemeTokens): ISeriesApi<SeriesType> {
@@ -2389,7 +2392,11 @@ export class ChartManager {
     const ts = this.chart.timeScale();
 
     if (bars.length <= displayCount && extendFutureBars === 0) {
-      ts.fitContent();
+      if (bars.length < 20) {
+        ts.setVisibleLogicalRange({ from: bars.length - displayCount, to: bars.length + 5 });
+      } else {
+        ts.fitContent();
+      }
       return;
     }