Test

Add missing generic on `Factory` subclasses #642

Job	Run time
Python 3.8, Database sqlite	1m 18s
Python 3.8, Database postgres	1m 11s
Python 3.9, Database sqlite	1m 40s
Python 3.9, Database postgres	1m 29s
Python 3.10, Database sqlite	2m 20s
Python 3.10, Database postgres	2m 11s
Python 3.11, Database sqlite	1m 47s
Python 3.11, Database postgres	1m 43s
Python 3.12, Database sqlite	1m 26s
Python 3.12, Database postgres	1m 29s
Python pypy-3.9, Database sqlite	3m 21s
Python pypy-3.9, Database postgres	2m 28s
Python pypy-3.10, Database sqlite	3m 18s
Python pypy-3.10, Database postgres	2m 34s
	28m 15s

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