## Add Source-Agnostic Artifact Backfill Service ### Summary Add an `ingestion` service method that links existing source artifacts to another `projectId` without re-ingesting or duplicating artifacts. ### Acceptance Criteria - [ ] Service method exists in `ingestion` to backfill a `projectId` onto existing artifacts for a source. - [ ] Backfill adds the `projectId` idempotently. - [ ] No duplicate artifact rows are created. - [ ] Empty source matches complete without error.
Add Source-Agnostic Artifact Backfill Service
Summary
Add an
ingestionservice method that links existing source artifacts to anotherprojectIdwithout re-ingesting or duplicating artifacts.Acceptance Criteria
ingestionto backfill aprojectIdonto existing artifacts for a source.projectIdidempotently.