DRAFT: Add model attr type enum #2993

Job	Run time
poetry	26s
generate-lockfile	40s
markdownlint	22s
djlint	20s
ruff-format	19s
ruff-lint	18s
yamllint	24s
check-docs-build	28s
changelog	21s
check-in-docker (3.10, 3.0.0)	7m 9s
unittest_report (3.13, postgresql, stable)	22m 52s
unittest (3.10, postgresql, stable)	18m 10s
unittest (3.10, postgresql, 3.0.0)	17m 49s
unittest (3.13, mysql, stable)	14m 38s
	1h 24m 16s

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