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There are 3 types of user setting storage in In-Portal:

The "UserPersistentSessionData" table could be used an extension for "Users" table for a particular user, where unlimited number of records could be added.

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1. add protected "\SessionStorage::$defaultPersistentVars" property of "array" type
2. in the "\SessionStorage::LoadPersistentVars" method:
   1. get "DefaultSettingsUserId" system setting value with fallback to "USER_ROOT" constant value
   2. if default user isn't the same as current user, then store persistent settings of above retrieved user in the "\SessionStorage::$defaultPersistentVars" property
3. in the "\SessionStorage::RecallPersistentVar" method, when handling "$default == ALLOW_DEFAULT_SETTINGS" logic branch:
   1. if "$var_name" key exists in "\SessionStorage::$defaultPersistentVars" array, then store it's value under current user using "\SessionStorage::StorePersistentVar" call
   2. otherwise set "false" into "$this->PersistentVars[$var_name]" and "return false"
4. confirm, that these cases work & no more, than 2 SELECT happens from "UserPersistentSessionData" table:
   1. non-root user has a persistent setting
   2. non-root user doesn't have a persistent setting
   3. root user has a persistent setting
   4. root user doesn't have a persistent setting

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