YunoHost app settings system and Debian timezone changes: who propagates the new zone to app databases?

Context

On a YunoHost server (assume the current stable release on its supported Debian base), the host timezone is set at the OS level, while each installed application keeps its own timezone value in its config file or internal database. YunoHost's app system pushes administrator-defined variables into app config files through its centralized settings mechanism, and its configure scripts can rewrite those files during upgrades.

Goal

I want a single, reliable way to change the server timezone once and have every installed app reflect it, without fighting the configuration scripts that may overwrite manual edits during app updates.

Uncertainty

It is unclear whether the app settings system exposes a standard mechanism for syncing the system timezone into per-app configuration, or whether each community-maintained package handles this differently in its install/configure scripts. The behavior may also vary between apps that read the OS timezone at runtime and apps that store a fixed value in their database at install time.

Questions

• Does YunoHost provide a documented hook or setting that propagates a system timezone change to installed applications?
• If not, is the supported approach to update each app's own setting and let its configure script regenerate the config, rather than editing files manually?
• How can I verify per-app which apps actually picked up the new zone after a change?