fix(backend): delete child notes when their parent note is deleted (fix #134)

[Pratyush-Panda-2006]

Description

This pull request prevents child notes from being orphaned in the database when a parent note or stack container is deleted. Previously, when deleteNote was invoked, the parent note was deleted via findOneAndDelete but its child notes (associated via parentId) remained in MongoDB, bloating the database with unreachable records.

Changes

• Updated the deleteNote controller in backend/src/controllers/notesController.js to execute Note.deleteMany({ parentId: id, userId: req.user._id }) after the parent note is successfully deleted.

Fixes #134

Summary by CodeRabbit

• Bug Fixes

  • Deleting a note now also removes any associated child notes owned by the same user, preventing leftover notes from appearing after a parent note is removed.

• Documentation

  • Added a new reference document listing high-priority product and platform issues, including suggested fixes and issue links.

[coderabbitai]

Caution

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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