Reduce API call when fetching new candles

src/Managing.Application/Grains/PriceFetcherGrain.cs

@@ -70,9 +70,6 @@ public class PriceFetcherGrain : Grain, IPriceFetcherGrain, IRemindable
             dueTime,
             TimeSpan.FromMinutes(intervalMinutes));
 
-        // Optional immediate kick-off to avoid waiting until next boundary
-        _ = FetchAndPublishPricesAsync();
-
         await base.OnActivateAsync(cancellationToken);
     }
 
@@ -134,6 +131,15 @@ public class PriceFetcherGrain : Grain, IPriceFetcherGrain, IRemindable
 
             var isFirstCall = !existingCandles.Any();
 
+            // Check if the next expected candle is available yet
+            var nextExpectedCandleTime = CandleHelpers.GetNextExpectedCandleTime(timeframe);
+            if (nextExpectedCandleTime > DateTime.UtcNow)
+            {
+                _logger.LogDebug("Next candle for {Exchange}-{Ticker}-{Timeframe} not available yet. Expected at {NextCandleTime}, current time: {CurrentTime}",
+                    exchange, ticker, timeframe, nextExpectedCandleTime, DateTime.UtcNow);
+                return; // Skip this fetch as the new candle won't be available
+            }
+
             var startDate = !isFirstCall
                 ? existingCandles.Last().Date
                 : new DateTime(2017, 1, 1);