Test

Allow functions as models #690

Job	Run time
Python 3.8, Database sqlite	1m 23s
Python 3.8, Database postgres	1m 18s
Python 3.9, Database sqlite	1m 27s
Python 3.9, Database postgres	1m 24s
Python 3.10, Database sqlite	2m 16s
Python 3.10, Database postgres	2m 3s
Python 3.11, Database sqlite	1m 39s
Python 3.11, Database postgres	1m 37s
Python 3.12, Database sqlite	1m 42s
Python 3.12, Database postgres	1m 32s
Python pypy-3.9, Database sqlite	3m 39s
Python pypy-3.9, Database postgres	2m 19s
Python pypy-3.10, Database sqlite	3m 8s
Python pypy-3.10, Database postgres	2m 34s
	28m 1s

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