/// Generic interface for plugin-accessible key-value storage.
/// The host implements this using the central `santui.db` `user_data` table.
pubtraitDbAccess: Send {/// Read a value stored by a plugin for a specific user.
/// Returns `None` if the key does not exist.
fnget_value(&self, plugin:&str, user_id:&str, key:&str)->Option<String>;/// Write a value (insert or update) for a plugin/user/key tuple.
fnset_value(&mutself, plugin:&str, user_id:&str, key:&str, value:&str);}