DRAFT: Add model attr type enum #2996

Job	Run time
poetry	24s
generate-lockfile	54s
djlint	25s
yamllint	20s
check-docs-build	27s
ruff-lint	20s
markdownlint	21s
ruff-format	22s
changelog	26s
check-in-docker (3.10, 3.0.0)	7m 49s
unittest (3.10, postgresql, stable)	15m 59s
unittest_report (3.13, postgresql, stable)	20m 29s
unittest (3.13, mysql, stable)	14m 46s
unittest (3.10, postgresql, 3.0.0)	10m 18s
	1h 13m 20s

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