Validate first key item and skip to insert items

KissMeConsole/Sources/KissConsole+DB.swift

@@ -299,6 +299,7 @@ extension KissConsole {
                     let db = try KissDB(directory: yearDbPath)
                     try db.begin()
                     
+                    var isFirstValidated = false
                     for candle in candles {
                         if trimAfterMarket {
                             guard candle.isValidInMarketTime else {
@@ -306,6 +307,16 @@ extension KissConsole {
                             }
                         }
                         let candleData = try CandleData(candle: candle)
+
+                        if !isFirstValidated {
+                            try db.selectData(key: candleData.key, into: { dataItem -> Bool in
+                                if dataItem.key == candleData.key {
+                                    isFirstValidated = true
+                                    print("Skipped by first validation: \(csvFile)")
+                                }
+                                return true
+                            })
+                        }
                         let item = KissDB.DataItem(key: candleData.key, value: candleData.data)
                         try db.insertData(item: item)