@mib2berlin Thank you, I tried to use this trigger in manual mode and realized that in my case it works only in manual mode, no automatic update is performed.
But still, the synchronization of deleted history works weirdly.
To speed up the tests, I decided to use different profiles in the same browser on the same device.
Authorized in empty new profiles 1 and 2
Deleted all history, pressed the GetUpdates trigger
Logged into profile 2, waited 1+ hour, nothing changed, all the history was still there, checked the synchronization tab in the settings, the synchronization time was updated, so the changes should have been downloaded, but it didn't happen. After that, I manually pressed the GetUpdates trigger, and only then did the history from profile 2 disappear.
Next, I opened 10 random sites in profile 1, clicked GetUpdates, switched to profile 2, clicked GetUpdates - the history of 10 links appeared in profile 2.
In profile 1, I deleted the last 5 entries in the history, GetUpdates, switched to profile 2, GetUpdates - the history has been updated, 5 links remain - correct.
I checked the local history sqlite files in both profiles - there are only 5 links in the history - correct
The most interesting thing. I created a new profile 3, logged in, and 10 records were displayed in the history again, instead of 5. I additionally manually clicked GetUpdates in profiles 1, 2 and then in 3, but no changes: profile 1 - 5 records in the history, profile 2 - 5 records, profile 3 - 10 records.
I will continue testing, maybe I can figure it out.
Vivaldi 6.7.3329.41 (Stable channel) stable (64-bit) Linux ARM64