feat: enhance logging and performance metrics for migration processes

cmd/go_migrate/transformer.go

@@ -7,8 +7,12 @@ import (
 )
 
 func transformRowsMssql(columns []ColumnType, in <-chan []UnknownRowValues, out chan<- []UnknownRowValues) {
+	chunkCount := 0
+	totalRowsTransformed := 0
+
 	for rows := range in {
-		log.Debugf("Chunk received, transforming...")
+		chunkStartTime := time.Now()
+		log.Debugf("Chunk #%d received, transforming %d rows...", chunkCount+1, len(rows))
 
 		for _, rowValues := range rows {
 			for i, col := range columns {
@@ -29,6 +33,13 @@ func transformRowsMssql(columns []ColumnType, in <-chan []UnknownRowValues, out
 			}
 		}
 
+		chunkCount++
+		totalRowsTransformed += len(rows)
+		chunkDuration := time.Since(chunkStartTime)
+		rowsPerSec := float64(len(rows)) / chunkDuration.Seconds()
+		log.Infof("Transformed chunk #%d: %d rows in %v (%.0f rows/sec) - Total: %d rows",
+			chunkCount, len(rows), chunkDuration, rowsPerSec, totalRowsTransformed)
+
 		out <- rows
 	}
 }