NoSQL CRUD Query Development -- 2

I’m refining a backend that runs on a document-oriented NoSQL database and I need concise, efficient queries that handle everyday CRUD work as well as richer aggregation pipelines for reporting dashboards. The emphasis is on correctness, performance, and clarity—every query should be easy for another developer to understand and extend.

Deliverables
• Query snippets covering Create, Read, Update, Delete, plus aggregation routines suitable for large datasets
• Clear inline comments or a short Markdown file noting index use, expected input/output, and performance tips
• A lightweight test or validation script proving each query returns the intended results against a sample dataset

I’ll provide a staging instance and example collections so you can iterate freely. Please keep solutions idiomatic to standard NoSQL drivers; once the queries are finalized I’ll wire them into the existing Node.js service layer. If you enjoy tuning document stores for speed and accuracy, I’m ready to collaborate right away.