docs: Document database exceptions

[loopassembly]

Summary

• Add a database exceptions page that documents the public Serverpod database exception types.
• Cover query exception metadata, row-level operation exceptions, and SQLite foreign key integrity checks.
• Link the CRUD updateById docs to the new exceptions page.

Verification

• npx --yes --cache ./.npm-cache markdownlint-cli docs/06-concepts/06-database/15-exceptions.md docs/06-concepts/06-database/05-crud.md
• git diff --check

I did not run a docs build because serverpod_docs/AGENTS.md says not to run build commands locally.

Closes serverpod/serverpod#3281

[Copilot]

Pull request overview

Note

Copilot was unable to run its full agentic suite in this review.

Adds documentation covering Serverpod database exception types and how to handle them, and links the CRUD guide to this new reference.

Changes:

• Added a new “Database exceptions” concept page with exception taxonomy and examples.
• Linked the CRUD updateById section to the new exceptions documentation.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
docs/06-concepts/06-database/15-exceptions.md	Introduces a new page documenting database exception behavior and types.
docs/06-concepts/06-database/05-crud.md	Adds a cross-link from CRUD docs to the new exceptions page.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[loopassembly]

Thanks for the review notes. I pushed a small follow-up commit (6c60511) to make the database-exception client serialization wording clearer.

I also checked the table and link comments. The table is using normal single-pipe Markdown syntax, and ./exceptions matches the Docusaurus slug for the numbered 15-exceptions.md page. The latest title, markdown-lint, and Docusaurus test-build checks are all green now.

[Swiftaxe]

A solid concept page! Nice!

Commented on a couple of minor things.

Thank you!

[Swiftaxe]

A convention we just started following is to add a frontmatter description to new pages for SEO.

Suggested change

	# Database exceptions
	---
	description: Serverpod wraps database failures in typed exceptions. Learn when each exception is thrown and how to handle query errors, row-level failures, and SQLite integrity checks.
	---
	# Database exceptions

[Swiftaxe]

Every line hard-wraps at 72 characters. Remove to match the rest of the docs.