feat(database): add write operation capabilities

[QuintinWillison]

I'm sponsoring this pull request because @dhruvxvaishnav is unable to create pull requests in this repository.

Closes #113

---

🤖 Supabase process notes:
At merge: keep the auto-added Co-authored-by: dhruvxvaishnav <dhruvvaishnav687@gmail.com> trailer in the squash message (that is what carries their contribution credit under squash), re-verify the head SHA is the one reviewed, and approve workflow runs per push after reading the diff.

[coderabbitai]

Important

• 🔍 Trigger review

This repository does not receive automatic reviews because it has fewer than 10 stars.

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Advanced

Run ID: d5f807de-5dc6-4202-b01e-26efd19925ed

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands.}

[QuintinWillison]

Bit awkward that I can only comment rather than request changes as the "author" of the PR, but this seemed to be the best mechanism for me to sponsor this change in...

[dhruvxvaishnav]

Thanks @QuintinWillison for sponsoring this PR and taking the time to review it. Both suggestions make sense. I'll correct the bulk-payload prerequisite and move the capability below insert, then run the package checks before pushing the update.

[dhruvxvaishnav]

Both review suggestions are addressed and pushed in c054913. On Linux with Node 22, all 214 tests passed, along with typechecking, matrix validation, report generation, and site generation. I also checked the generated links for the three new capabilities and their related specs. The Windows suite hit path-specific failures in unchanged Python/Swift parser tests, so the full suite was run on Linux rather than modifying those tests. The working tree is clean.