DRAFT: Add model attr type enum #2974

Job	Run time
poetry	21s
generate-lockfile	54s
check-docs-build	28s
djlint	23s
ruff-format	24s
ruff-lint	22s
yamllint	26s
changelog	31s
markdownlint	20s
check-in-docker (3.10, 3.0.0)	6m 25s
unittest_report (3.13, postgresql, stable)	23m 53s
unittest (3.10, postgresql, stable)	19m 50s
unittest (3.13, mysql, stable)	14m 37s
unittest (3.10, postgresql, 3.0.0)	17m 36s
	1h 26m 30s

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