this looks like some kind of race condition where we are attempting to compact a PageStore which has not been properly opened yet.
Various places in Database are touching the pageStore without being synchronized, so fix those and lets see if that helps

Error handling improvements

Forbid incorrect nesting of aggregates and window functions

Parse GENERATED * AS IDENTITY correctly

Fix subtraction of timestamps

close file/release lock on failures

Assorted minor changes in window processing code

Fix some window aggregates and reduce amount of collecting implementations

Separate aggregate and window code in some places