Implement Server-Side Evidence Uniqueness Validation #381
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Implement Server-Side Evidence Uniqueness Validation
Original Task
Implement Server-Side Evidence Uniqueness Validation
Summary of Changes
This pull request adds comprehensive server-side validation to ensure evidence uniqueness, preventing duplicate submissions and improving system integrity.
Acceptance Criteria
Create a uniqueness validation method that checks against existing evidence records
Implement a caching layer to quickly reject duplicate submissions
Log all duplicate submission attempts with detailed error information
Return a 409 Conflict HTTP status for duplicate submissions
100% unit test coverage for uniqueness validation logic
Uniqueness check completes in less than 50ms
Tests