fix: auto-generate ID+timestamps in storage layer on save

pkg/storage/json_storage.go

@@ -7,6 +7,9 @@ import (
 	"os"
 	"path/filepath"
 	"sync"
+	"time"
+
+	"github.com/google/uuid"
 
 	"git.tukangketik.id/swanadiva/hostkeeper/internal/models"
 )
@@ -100,6 +103,14 @@ func (s *JSONStorage) SaveHost(ctx context.Context, host *models.Host) error {
 	s.mu.Lock()
 	defer s.mu.Unlock()
 
+	if host.ID == "" {
+		host.ID = uuid.New().String()
+	}
+	if host.CreatedAt.IsZero() {
+		host.CreatedAt = time.Now()
+	}
+	host.UpdatedAt = time.Now()
+
 	hosts, err := s.listHostsInternal()
 	if err != nil {
 		return err
@@ -202,6 +213,14 @@ func (s *JSONStorage) SaveKeyPair(ctx context.Context, keyPair *models.KeyPair)
 	s.mu.Lock()
 	defer s.mu.Unlock()
 
+	if keyPair.ID == "" {
+		keyPair.ID = uuid.New().String()
+	}
+	if keyPair.CreatedAt.IsZero() {
+		keyPair.CreatedAt = time.Now()
+	}
+	keyPair.UpdatedAt = time.Now()
+
 	keys, err := s.listKeyPairsInternal()
 	if err != nil {
 		return err
@@ -304,6 +323,14 @@ func (s *JSONStorage) SaveSnippet(ctx context.Context, snippet *models.Snippet)
 	s.mu.Lock()
 	defer s.mu.Unlock()
 
+	if snippet.ID == "" {
+		snippet.ID = uuid.New().String()
+	}
+	if snippet.CreatedAt.IsZero() {
+		snippet.CreatedAt = time.Now()
+	}
+	snippet.UpdatedAt = time.Now()
+
 	snippets, err := s.listSnippetsInternal()
 	if err != nil {
 		return err