Function migrateUserStorage

frontend/src/utils/storage-migrate.ts:194–215

(oldEmail: string, newEmail: string)

 * Renames all keys ending with `.{oldEmail}` to end with `.{newEmail}`.
 */
export function migrateUserStorage(oldEmail: string, newEmail: string) {
  if (!oldEmail || !newEmail || oldEmail === newEmail) return;

  const suffix = `.${oldEmail}`;
  const keysToMigrate: string[] = [];

  for (let i = 0; i < localStorage.length; i++) {
    const key = localStorage.key(i);
    if (key?.endsWith(suffix)) {
      keysToMigrate.push(key);
    }
  }

  for (const key of keysToMigrate) {
    const newKey = key.slice(0, -suffix.length) + `.${newEmail}`;
    const value = localStorage.getItem(key);
    if (value !== null) {
      localStorage.setItem(newKey, value);
      localStorage.removeItem(key);
    }
  }
}