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Regarding migration tooling, I think that's given with flyway. Regarding seeding, you could just write a small gradle task that uses https://github.com/daviddenton/databob.kotlin which is often used in testing and save it to the db. I don't ever used seed files, so I don't know how/why they are better than my suggestion :)
Ktor is officially supported by open api, the last time I tried it (years ago?) it had some problems but worked okay overall. https://github.com/OpenAPITools/openapi-generator We preferred to just use annotations and generated the documentation. Regarding graphql, there is https://opensource.expediagroup.com/graphql-kotlin/docs/ which became sort of the de facto standard in the kotlin world. So I think support is sufficiently given, but there might be things you are still missing?
Their client framework officially supports ktor client https://github.com/ExpediaGroup/graphql-kotlin/tree/master/clients/graphql-kotlin-ktor-client while their schema generator seems to be just framework-independent jvm library https://github.com/ExpediaGroup/graphql-kotlin/tree/master/generator/graphql-kotlin-schema-generator And you could use their gradle plugin as described here https://github.com/ExpediaGroup/graphql-kotlin/tree/master/plugins/graphql-kotlin-gradle-plugin which would make the whole thing a breeze I guess :)