Relax full cpu usage (99% -> 80%)

KissMeConsole/Sources/KissConsole.swift

@@ -1297,10 +1297,18 @@ extension KissConsole {
         print("Building total candle files... \(totalCsvFiles)")
         for (productNo, csvFiles) in candleFiles {
             print("Building candle db for productNo: \(productNo), csv: \(csvFiles.count)")
-            let startTime = Date.appTime
-            if buildCandleMinuteDB(productNo: productNo, csvFiles: csvFiles) {
-                print("Success candle db with elapsed time: \(Date.appTime - startTime)")
+            
+            let semaphore = DispatchSemaphore(value: 0)
+            Task {
+                let startTime = Date.appTime
+                if buildCandleMinuteDB(productNo: productNo, csvFiles: csvFiles) {
+                    print("Success candle db with elapsed time: \(Date.appTime - startTime)")
+                }
+                
+                try await Task.sleep(nanoseconds: 1_000_000_000)
+                semaphore.signal()
             }
+            semaphore.wait()
         }
     }