Add .migrated directory for migrated json files

cmd/server/migrate_json.go

@@ -13,6 +13,7 @@ import (
 
 // migrateFromJSON migrates instances from JSON files to SQLite database
 // This is a one-time migration that runs on first startup with existing JSON files.
+// Migrated files are moved to a .migrated subdirectory to avoid re-importing.
 func migrateFromJSON(cfg *config.AppConfig, db database.InstanceStore) error {
 	instancesDir := cfg.Instances.InstancesDir
 	if instancesDir == "" {
@@ -24,16 +25,6 @@ func migrateFromJSON(cfg *config.AppConfig, db database.InstanceStore) error {
 		return nil // No instances directory, nothing to migrate
 	}
 
-	// Check if database is empty (no instances)
-	existing, err := db.LoadAll()
-	if err != nil {
-		return fmt.Errorf("failed to check existing instances: %w", err)
-	}
-
-	if len(existing) > 0 {
-		return nil // Database already has instances, skip migration
-	}
-
 	// Find all JSON files
 	files, err := filepath.Glob(filepath.Join(instancesDir, "*.json"))
 	if err != nil {
@@ -46,6 +37,12 @@ func migrateFromJSON(cfg *config.AppConfig, db database.InstanceStore) error {
 
 	log.Printf("Migrating %d instances from JSON to SQLite...", len(files))
 
+	// Create migrated directory
+	migratedDir := filepath.Join(instancesDir, ".migrated")
+	if err := os.MkdirAll(migratedDir, 0755); err != nil {
+		return fmt.Errorf("failed to create migrated directory: %w", err)
+	}
+
 	// Migrate each JSON file
 	var migrated int
 	for _, file := range files {
@@ -53,6 +50,14 @@ func migrateFromJSON(cfg *config.AppConfig, db database.InstanceStore) error {
 			log.Printf("Failed to migrate %s: %v", file, err)
 			continue
 		}
+
+		// Move the file to the migrated directory
+		destPath := filepath.Join(migratedDir, filepath.Base(file))
+		if err := os.Rename(file, destPath); err != nil {
+			log.Printf("Warning: Failed to move %s to migrated directory: %v", file, err)
+			// Don't fail the migration if we can't move the file
+		}
+
 		migrated++
 	}