Mondo Diaz c184272cec Upload workflow enhancements: S3 verification, timing, client checksum support (#19) ...

- Add S3 object verification after upload (size validation before DB commit)
- Add cleanup of S3 objects if DB commit fails
- Record upload duration_ms and user_agent
- Support X-Checksum-SHA256 header for client-side checksum verification
- Add already_existed flag to StorageResult for deduplication tracking
- Add status, error_message, client_checksum columns to Upload model
- Add UploadLock model for future 409 conflict detection
- Add consistency-check admin endpoint for detecting orphaned S3 objects
- Add migration 005_upload_enhancements.sql

2026-01-06 15:31:59 -06:00

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