Reduce API call when fetching new candles

src/Managing.Domain/Candles/CandleHelpers.cs

@@ -107,17 +107,33 @@ public static class CandleHelpers
     public static TimeSpan GetDueTimeForTimeframe(Timeframe timeframe, DateTime now)
     {
         var intervalMinutes = GetBaseIntervalInSeconds(timeframe) / 60;
-        
+
         // Calculate the next candle boundary
         var nextBoundary = GetNextCandleBoundary(now, intervalMinutes);
-        
+
         // Add 1 second to ensure we're after the candle closes
         var targetTime = nextBoundary.AddSeconds(1);
-        
+
         // Return the time difference
         return targetTime - now;
     }
-    
+
+    /// <summary>
+    /// Gets the next expected candle time for the given timeframe.
+    /// This is useful to determine if a new candle should be available yet.
+    /// </summary>
+    /// <param name="timeframe">The timeframe to calculate for</param>
+    /// <param name="now">The current time (defaults to DateTime.UtcNow)</param>
+    /// <returns>The next expected candle time</returns>
+    public static DateTime GetNextExpectedCandleTime(Timeframe timeframe, DateTime? now = null)
+    {
+        var currentTime = now ?? DateTime.UtcNow;
+        var intervalMinutes = GetBaseIntervalInSeconds(timeframe) / 60;
+
+        // Calculate the next candle boundary
+        return GetNextCandleBoundary(currentTime, intervalMinutes).AddSeconds(-1);
+    }
+
     private static DateTime GetNextCandleBoundary(DateTime now, double intervalMinutes)
     {
         // For different timeframes, we need to align to different boundaries
@@ -159,7 +175,7 @@ public static class CandleHelpers
             var boundary = new DateTime(now.Year, now.Month, now.Day, 0, 0, 0);
             return boundary.AddDays(1);
         }
-        
+
         // Fallback to 5-minute intervals
         var fallbackMinute = (now.Minute / 5) * 5;
         var fallbackBoundary = new DateTime(now.Year, now.Month, now.Day, now.Hour, fallbackMinute, 0);