lib/db, lib/model: Create temp sorting database in config dir (fixes #3449) #3454
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Purpose
Create temp databases beside main database.
A design issue here is that the index sorter is created at a point quite far in the call stack from the closest place or even package that knows anything about disk paths. My solution takes a quite circuitous path via letting the main database know where it lives and have the model check that when it kicks of the index sending routines... I'm all open for suggestions on better ways to do this.
Testing
STTRACE=model
, the log "opened sorter" line shows the expected path.