No, we don't, and we don't on purpose. We thought about doing that way back when we first start ed syncing calendars (whether or not to check periodically to make sure that the booking was still there) and decided against it.
There were several reasons but the biggest is we want our calendar syncs to "do no harm" first and foremost.
If you change your calendars manually, we don't want our syncs coming long and changing them back to something you don't want. Our system should only add, update or delete bookings from third-party calendars the FIRST time and then leave it at that.
There are some updates we're going to be making so you can get more transparency into the sync process, but the "do no harm" rule will still apply.