Keep a unique field where update needs it, and a buffer a buffer

[SerhiyGreench]

What does this PR do?

Two defects in the query extensions, both silent.

accessScope nested the caller's where inside AND when it added its filters. That is correct for findMany and fatal for update, delete and findUnique: those take a WhereUniqueInput, and Prisma requires a unique field at its top level, so moving id one level down left the argument with no unique field and Prisma refused the call rather than scoping it. Every scoped update in every service using this failed — in scope or out — and a service that logs rather than rethrows reported it to its caller as a save that succeeded and changed nothing.

The caller's own conditions now stay at the top level and only ours go into AND, with their AND conjoined rather than overwritten. Top-level conditions and AND conjoin, so a caller supplying their own value for a scope column still gets ours and cannot widen past it.

isoDates rebuilt every object through Object.entries, so a Buffer came back as { "0": 137, "1": 80, … } — one key per byte, fifty times the size, and no longer anything Buffer.isBuffer recognises. A Bytes column read through the extension arrived unusable and the failure looked like the row not existing. Typed arrays and ArrayBuffer are now returned as they came; none of them can hold a Date, so there was never anything in them to walk for.

toIsoDates is exported so it can be tested without a database, as accessWhere already is.

Type of change

• Bug fix
• New feature
• Documentation
• Refactor / internal
• Other:

Checklist

• I have read the Contributing guide.
• Tests added or updated, and the full suite passes locally (npm test).
• Docs / doc-blocks updated where relevant.
• The PR is focused on a single logical change.

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  commercially, royalty-free, my contribution stays available under
  GPL-3.0, I keep my copyright, and I understand I will receive no fee for
  it. If I did not agree, I would not be submitting this contribution.

https://claude.ai/code/session_017BfLMdWM8zt8y3QzJxKods

[github-actions]

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[SerhiyGreench]

I have read the CLA Document and I hereby sign the CLA