[question] squashing migrations into one file (as a dev process)

## I'm submitting a...

- [ ] Bug report
- [ ] Feature request
- [x] Question

## Current behavior

After some time I want would want to squash all migrations into one file, let alone for searching experience because old migrations become less of interest.

The process would be similar to e.g. `pg_dump`-ing a new migration and just remove all files. However, pg_dump is vastly environment specific and adds boilerplate only relevant to `pg_dump`.

Ideally just all files get concatenated and will also not be run on **next** mig.

Q: Is there any functionality already existing? Or any procedure like this known?