`generate_base_model` should work with seeds

[elyobo]

Describe the feature

Wrapping a base model around a seed is frequently useful, but generate_base_model expects sources onlyl.

Describe alternatives you've considered

• Faking up my seed as a source so that I can run the codegen.
• Building up base models manually.
• Manually modifying seeds to clean up column names, data.

Additional context

Not database specific, but I have seeds that are static extracts from other systems that just spit out CSV. I'd rather keep processing of the CSVs to a minimum to make updating them as simple as possible (reexport, reseed, rebuild) and so want to use a base model to e.g. rename unfriendly columns, clean up and retype data etc.

This would also benefit generate_source; a seed is a type of source and the same needs to document and wrap in base models exist.

Who will this benefit?

Users of seeds and base models.

Are you interested in contributing this feature?

Yes, but need guidance.

[elyobo]

Maybe just double documenting these as sources is a reasonable approach, seems to work.

Noted also that using seeds for data is frowned upon and so perhaps the lack of support is deliberate.

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[github-actions[bot]]

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