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Issue #30 Implementation Doc Stub

1. Issue reference

  • GitHub issue: #30
  • Issue title: [Backend][Retrieval] User-profile-aware reranking (grade/subject/tier)
  • Issue type: feature
  • Milestone: Backend RAG M3 - Retrieval & Chat Quality

2. Summary

  • What this issue changed: TBD
  • Why the change was needed: improve result quality by using profile context during reranking.

3. Initial repo state

  • Relevant behavior before implementation: the hybrid retrieval plan already calls out context-aware reranking as part of the target architecture.
  • Known constraints or gaps at start: user-profile signals and reranker behavior must remain aligned with the plan and actual profile data availability.

4. Plan doc referenced

  • Plan doc path: docs/plans/2026-02-21-global-retrieval-hybrid-rrf-implementation.md
  • Plan status at implementation start: Draft / For Review
  • Was the plan updated during implementation?: TBD
  • If yes, what changed in the plan?: TBD

5. Decisions taken

Decision Reason Alternative rejected
Stub only Reserve a dedicated implementation record for reranking changes. Folding reranking notes into unrelated retrieval docs.

6. Files changed

File Change summary
docs/implementation/issue-30-user-profile-aware-reranking.md Created implementation doc stub.

7. Migrations / schema changes

  • Migration files: none yet
  • Schema changes: none yet
  • Data backfill or manual steps: none yet
  • Rollback notes: not applicable yet

8. API changes

Surface Change Compatibility impact
None yet No implementation details recorded yet. None

9. Tests added or updated

Test file or suite Change
None yet No implementation work has started.

10. Risks / caveats

  • Reranking can silently bias or suppress results if profile data or prompt assumptions are wrong.

11. Follow-up work

  • Keep the plan doc current if reranking signals or score composition change.
  • Record validation cases for grade, subject, and tier behavior once implementation starts.

12. Final repo state

  • Relevant behavior after implementation: not implemented yet; stub created to reserve the issue record.
  • Remaining limitations: reranking implementation and validation are pending.

13. Docs updated

Doc path Update summary
docs/implementation/issue-30-user-profile-aware-reranking.md Added initial implementation doc stub.