Allow functions as models #668

Job	Run time
Python 3.8, Database sqlite	1m 32s
Python 3.8, Database postgres	1m 32s
Python 3.9, Database sqlite	1m 45s
Python 3.9, Database postgres	1m 30s
Python 3.10, Database sqlite	2m 30s
Python 3.10, Database postgres	2m 27s
Python 3.11, Database sqlite	1m 55s
Python 3.11, Database postgres	1m 46s
Python 3.12, Database sqlite	1m 40s
Python 3.12, Database postgres	1m 46s
Python pypy-3.9, Database sqlite	3m 28s
Python pypy-3.9, Database postgres	2m 40s
Python pypy-3.10, Database sqlite	3m 33s
Python pypy-3.10, Database postgres	3m 1s
	31m 5s

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