SECRET_KEY ("Titkosítási kulcs") is a data-encrypting key — regenerating it on
restore would render stored data unreadable. data_key:true makes the controller
recover it from the guest's own app.yaml (live/PBS) and fail closed if it can't,
rather than ever regenerating. Pairs with controller v0.53.0.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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