Test

Allow functions as models #691

Job	Run time
Python 3.8, Database sqlite	1m 8s
Python 3.8, Database postgres	1m 5s
Python 3.9, Database sqlite	1m 9s
Python 3.9, Database postgres	1m 6s
Python 3.10, Database sqlite	1m 53s
Python 3.10, Database postgres	1m 52s
Python 3.11, Database sqlite	1m 27s
Python 3.11, Database postgres	1m 23s
Python 3.12, Database sqlite	1m 21s
Python 3.12, Database postgres	1m 18s
Python pypy-3.9, Database sqlite	2m 50s
Python pypy-3.9, Database postgres	2m 6s
Python pypy-3.10, Database sqlite	2m 34s
Python pypy-3.10, Database postgres	2m 5s
	23m 17s

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