Write a Technical Specification Document

Write a technical specification document for the following feature:

Feature name: [name]
Product context: [what product this belongs to]
Author: [PM / tech lead / engineer]
Status: [draft / in review / approved]

Technical specification sections:

1. Problem statement: what user need or business problem does this address?
2. Proposed solution: high-level description of the technical approach
3. Non-goals: explicit list of what this spec does NOT cover
4. System design:
   - Architecture diagram description (describe components and how they interact)
   - Data model changes: new tables, columns, or schema changes
   - API changes: new or modified endpoints (request/response schemas)
   - Third-party integrations: any external services involved
5. Implementation plan:
   - Phases or milestones
   - Dependencies and blockers
   - Estimated effort (rough T-shirt sizing)
6. Rollout strategy: feature flags / percentage rollout / kill switch
7. Observability: metrics to monitor, alerts to set up, logging requirements
8. Testing plan: unit tests / integration tests / manual QA checklist
9. Security considerations: data handling, auth, access control
10. Open questions: decisions still to be made, who needs to decide