Reversal Repository

[hayesZach]

Closes CSF-772

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Note

Adds a production-ready public repository for reversals with validation, pagination, and soft-deletes.

• Implement public.ReversalRepository with Create, BulkCreate, Read, Update (via dto.ReversalUpdates), Delete (soft-delete), and List (filters: steam_id, marketplace_slug, cursor, limit)
• Wire into publicRepository.Reversal() and migrate models.Reversal; create unique index on (steam_id, marketplace_slug) excluding soft-deleted rows
• Introduce dto.ReversalUpdates (validation, ToFields) and list options; comprehensive unit tests for DTO and repository
• Simplify dto.Cursor/proto to only include id; update generated cursor.pb.go
• Enhance models: add soft-delete to Model, export Epoch, refactor ValidateSourceAndRelatedID, add Source.String()
• Consolidate test DB setup (testutil.NewTestDB) and add util.Ptr helper

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[linear]

CSF-772 Reversal Repository

[cursor]

Cursor Bugbot has reviewed your changes and found 2 potential issues.

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