Add Evidence Versioning

[dDevAhmed]

📚 Overview

Support multiple versions of evidence for a claim.

Users may update evidence over time.

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🎯 Objectives

• Preserve history
• Allow latest pointer
• Enable audit trail

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🧠 Scope

DB Table:

• evidence_versions
• id
• evidence_id
• version
• cid
• created_at

Logic:

• Increment version automatically
• Fetch latest version

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✅ Acceptance Criteria

• Version history stored
• Latest version returned
• No overwrites

---

⏳ Complexity

High

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[ummarig]

@ummarig has applied to work on this issue as part of the Stellar Wave Program's 2nd wave.

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Congratulations, @ummarig! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on February 26, 2026.

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