[FEAT]: Field-Level Traceability Engine

[Aryama-srivastav]

---

name: 🚀 Feature Request
about: Field-Level Traceability Engine
title: "[FEAT]: Field-Level Traceability Engine"
labels: enhancement
assignees: ''

---

📝 Description

Currently, form filling has no source showing:

• Which source provided each field?
• Which extraction method was used?
• What was the confidence level?
• Were multiple sources considered?

💡 Rationale

This violates explainability requirements and prevents downstream conflict detection. Auditors cannot trace decisions back to evidence sources.

🛠️ Proposed Solution

Implement minimal evidence chain capture during form filling:

• Track source_id, method, and confidence for each field
• Store in new FieldTraceRecord data model
• Return mapping report with evidence metadata
• Evidence captured automatically during batch and single-form operations

✅ Acceptance Criteria

• Evidence chain captures: source_id, method, confidence for every populated field
• Mapping report includes evidence metadata for each matched field
• Unit tests: evidence capture accuracy (3 scenarios)
• Integration tests: batch endpoint returns evidence metadata
• No breaking changes to existing APIs (all new fields are additive)