Defer Django and sqlalchemy imports #667

Job	Run time
Python 3.8, Database sqlite	1m 31s
Python 3.8, Database postgres	1m 25s
Python 3.9, Database sqlite	1m 37s
Python 3.9, Database postgres	1m 28s
Python 3.10, Database sqlite	2m 15s
Python 3.10, Database postgres	2m 16s
Python 3.11, Database sqlite	1m 50s
Python 3.11, Database postgres	1m 42s
Python 3.12, Database sqlite	1m 31s
Python 3.12, Database postgres	1m 24s
Python pypy-3.9, Database sqlite	3m 15s
Python pypy-3.9, Database postgres	2m 40s
Python pypy-3.10, Database sqlite	3m 32s
Python pypy-3.10, Database postgres	2m 50s
	29m 16s

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