If you're writing C#, you could take a look into Source Generators. They're supported directly by Roslyn I believe, and are pure C# instead of t4's syntax. They're often used with attributes to augment types, but I believe they can be used to generate sources on their own, and even read from a config file if you want to (or maybe even query the DB, if that's something you want to do at build time for some reason, though I've never tried this).
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