Quoting msg400205 by Petr in bpo-42064:
I think the module could use a more comprehensive review for GIL handling, rather than doing it piecewise in individual PRs. I recommend that any function passed to SQLite (and only those) should
  - be named `*_callback`, for clarity
  - acquire the GIL at the very start
  - release the GIL at the very end

I'd like to propose further enhancements:
  - use intermingled declarations in the affected functions; this will make GIL acquisition stand more out, and it also improves readability and makes it easier to trace refs
  - take the naming step further: I'd like to normalise PyObject * callback variable names, the extremely long function_pinboard_* names, and also drop the C callback prefixes ('_' and 'pysqlite_')

If you agree, I'll create separate PR's for those; one for each refactor. I think it will enhance readability a lot.

The general policy is to only improve style for code you touch for some other reasons. You're changing lots of the callback code in bpo-42064, so I reckon making things more readable is fine.

Obviously, this case could be code churn(we don't accept normally), but if other core-dev agree with the changes. I am fine.

We'll do the changes Petr proposed first, and then I'll see how invasive the other changes will be. If the diffs end up being concise, I'll put them up for review :)

New changeset 001ef4600f5ab2e1d7825ddbc0f253377c234d7e by Erlend Egeberg Aasland in branch 'main':
bpo-44991: Make GIL handling more explicit in `sqlite3` callbacks (GH-27934)
https://github.com/python/cpython/commit/001ef4600f5ab2e1d7825ddbc0f253377c234d7e

New changeset 0474d06008f8c9eba660ed20d336ffdc5c4db121 by Erlend Egeberg Aasland in branch 'main':
bpo-44991: Normalise `sqlite3` callback naming (GH-28088)
https://github.com/python/cpython/commit/0474d06008f8c9eba660ed20d336ffdc5c4db121

The remaining function_pinboard_* renames are part of PR-27940.

New changeset cfb1df3b71501a80ed57739181ec2ed30012c491 by Erlend Egeberg Aasland in branch 'main':
bpo-44991: Normalise function and collation callback naming (GH-28209)
https://github.com/python/cpython/commit/cfb1df3b71501a80ed57739181ec2ed30012c491