refactor: add validation feature to compare row counts between source and target databases

cmd/go_migrate/main.go

@@ -22,6 +22,7 @@ func main() {
 	checkExpiry()
 
 	configPath := flag.String("config", "", "path to migration config file")
+	validate := flag.Bool("validate", false, "count rows in source and target per job and compare")
 	flag.Parse()
 
 	if flag.NArg() > 1 {
@@ -78,6 +79,12 @@ func main() {
 	defer sourceDb.Close()
 	defer targetDb.Close()
 
+	if *validate {
+		validationResults := validateJobs(ctx, sourceDb, targetDb, migrationConfig.Jobs, migrationConfig.MaxParallelWorkers)
+		printValidationReport(validationResults)
+		return
+	}
+
 	results := processMigrationJobs(ctx, sourceDb, targetDb, migrationConfig.Jobs, migrationConfig.MaxParallelWorkers)
 
 	log.Info("=== RESUMEN DE MIGRACIÓN ===")