Function cleanupDistributedDraftThumbnails

cleanupDistributedDraftThumbnails(
    jobId: string,
    userId: string,
    draftId: string,
    platformUploads: PlatformUpload[],
    metadataByPlatformId: Map<string, PlatformUploadMetadata>,
): Promise<void>
Clears distributed draft thumbnail keys from the draft document and deletes the R2 objects. Uses the metadata snapshot from this distribution attempt so thumbnails replaced mid-upload are not removed. Clears shared thumbnailR2Key with null and per-platform overrides with '' so platforms do not fall back to a shared thumbnail that was not distributed.
Parameters
- jobId: string
  Upload job id (for logging).
- userId: string
  Draft owner.
- draftId: string
  Draft whose thumbnails were distributed.
- platformUploads: PlatformUpload[]
  Platform upload rows included in this distribution attempt.
- metadataByPlatformId: Map<string, PlatformUploadMetadata>
  Metadata snapshot keyed by platform upload id.
Returns Promise<void>
- Defined in lib/api/distribute.ts:783