[BUG]: Saving the last active schedule does not work for more than one ThermoZone #800
Description
Describe the bug.
The last active schedule based on the last used datetime will be incorrectly used for all ThermoZones that don't have a schedule selected, instead of for the Zone that had it set last as the active schedule.
The present code does save the last active schedule name per Zone when an schedule has been set. This data is reset/lost at a HA restart or Integration-reload.
Expected behavior
We would need to cache the active schedule-name per Zone which would result in this data to be still available after a HA restart.
What version of Home Assistant Core has the issue?
core-2025.10.2
What type of installation are you running?
Home Assistant Supervised
How and which version of the integration do you have installed?
Manually installed custom_component
What kind of Plugwise device is having issues?
Smile: Adam (including Lisa, Tom, Floor)
What firmware version is your Plugwise product at?
3.9.0
Home Assistant Logging (optional)
No response
Diagnostics information
No response
Additional information
No response