Private State
Plugin state lives inside the encrypted .postsnail Shell and must never enter the public Website ZIP.
Missing Plugins
If a Shell contains state for a plugin that is not installed, PostSnail returns a warning and preserves the state untouched.
Unknown Fields
Unknown plugin fields and future schema data are preserved without interpretation whenever possible.
Future Migrations
Future official plugins can add deterministic migrations through declared hooks and PSEP-reviewed compatibility rules.