feat: add validation feature for row count comparison

Add a validate command that compares row counts between source and target tables after a migration.

cmd/go_migrate/main.go

@@ -19,8 +19,10 @@ import (
 
 func main() {
 	configureLog()
+	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 {
@@ -55,6 +57,7 @@ func main() {
 			return err
 		}
 
+		log.Info("Successfully connected to sourceDb")
 		return nil
 	})
 
@@ -65,6 +68,7 @@ func main() {
 			return err
 		}
 
+		log.Info("Successfully connected to targetDb")
 		return nil
 	})
 
@@ -75,6 +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 ===")