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- Wrap DELETE + INSERTs in a database transaction via new ReplaceEnvVarsByAppID() to prevent silent data loss on partial insert failure. Rollback on any error; return 500 instead of 200. - Add server-side validation rejecting entries with empty keys (returns 400 with error message). - Add frontend error handling for non-2xx responses with user-visible alert messages. - Remove stale //nolint:dupl directives (files no longer duplicate).