The GNSS systems do of course know when leap seconds occur, one of their
purposes is to communicate accurately UTC. But unlike system clocks of
computers which often are halted during leap seconds or slowed down before
them, to avoid complications, the satellites will transmit their codes
strictly also over leap seconds, and orbital information like elevation is
available in these. Therefore my advice to use on the Sqlite level a day
segmented two column time stamp in this particular case. It is also handy
if queries are for certain dates or date intervals, perhaps the performance
for such queries even increases compared to a single column time unit
counter?

The GNSS systems use internally their own time, one of them is GPS time. To
the consumer normally UTC is provided, which I assume is also here the
case.
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