Caldav & Laraval

[PinterMilan]

Hi, I have a Laravel 9.* project with PHP 8.2, which functions as a calendar.
I have already installed and configured the Caldav server, so it is working. When i create an event in Thunderbird cal, then that event is stored in db.

I would like to synchronize the Thunderbird calendar with my Laravel calendar. My plan is that when the Thunderbird client requests events from the Caldav server, the Caldav server will send the stored events from the SabreDAV database, including the events stored by my Laravel Calendar in another database (MySQL).

I plan to convert the details of the events stored in my Laravel calendar into iCalendar format and merge the two event lists together. This way, Thunderbird will receive all corresponding events.

My question is: where can I find the code that manages event handling? When a synchronization request for events comes in, which code snippet is responsible for querying the database and sending the events to the Thunderbird client? I believe I should edit that snippet to merge and send the events.

Furthermore, when a user creates an event in their Thunderbird Calendar, Caldav will store it in the database. Which code snippet is responsible for storing the events in the database?

Thanks for your help in advance.