refactor: improve user cache management and password migration

admin/user.go

@@ -113,19 +113,40 @@ func getUsersForm(db *sql.DB, page int64, search string) PaginationForm {
 	}
 }
 
+// clearUserCache clears all cache keys starting with nio:user:
+func clearUserCache(cache *redis.Client) error {
+	ctx := context.Background()
+	iter := cache.Scan(ctx, 0, "nio:user:*", 100).Iterator()
+	for iter.Next(ctx) {
+		if err := cache.Del(ctx, iter.Val()).Err(); err != nil {
+			return fmt.Errorf("failed to delete cache key %s: %v", iter.Val(), err)
+		}
+	}
+	return iter.Err()
+}
+
 func passwordMigration(db *sql.DB, cache *redis.Client, id int64, password string) error {
 	password = strings.TrimSpace(password)
 	if len(password) < 6 || len(password) > 36 {
 		return fmt.Errorf("password length must be between 6 and 36")
 	}
+	hash_passwd := utils.Sha2Encrypt(password)
 
+	// Update password in database
 	_, err := globals.ExecDb(db, `
 		UPDATE auth SET password = ? WHERE id = ?
-	`, utils.Sha2Encrypt(password), id)
+	`, hash_passwd, id)
 
-	cache.Del(context.Background(), fmt.Sprint("nio:user:root"))
+	if err != nil {
+		return err
+	}
 
-	return err
+	// Clear all user related cache
+	if err := clearUserCache(cache); err != nil {
+		return fmt.Errorf("failed to clear user cache: %v", err)
+	}
+
+	return nil
 }
 
 func emailMigration(db *sql.DB, id int64, email string) error {
@@ -228,7 +249,10 @@ func UpdateRootPassword(db *sql.DB, cache *redis.Client, password string) error
 		return err
 	}
 
-	cache.Del(context.Background(), fmt.Sprint("nio:user:root"))
+	// Clear all user related cache
+	if err := clearUserCache(cache); err != nil {
+		return fmt.Errorf("failed to clear user cache: %v", err)
+	}
 
 	return nil
 }