ai-persistence/build-cloudflare-artifact-store

Cloudflare Artifact + Blob Store

withGenerationPersistence(persistence) needs only stores.generationRuns to track a generation's lifecycle. Add stores.artifacts (metadata) and stores.blobs (the bytes) — both, or neither — and the middleware also persists the generated media: image/audio/TTS/video/transcription bytes land at blob key artifacts/<runId>/<artifactId>, with an ArtifactRecord row describing each.

The deliverable is one file in the Worker — e.g. src/lib/generation-persistence.ts — exporting a factory that builds an AIPersistence from the request's R2 + D1 bindings, plus a GET route that serves artifact bytes with retrieveArtifact / retrieveBlob.

Read the sibling ai-persistence/build-cloudflare-adapter skill for the per-request-binding rule, wrangler config shape, D1 migration workflow, and the chat (generation-run/message) side. This skill covers only the two byte-storage stores and how to compose them.

The two contracts

Both come from @tanstack/ai-persistence. defineBlobStore / defineArtifactStore type an object literal inline (autocomplete + contract checking, no separate annotation).

// BlobStore — the byte layer. R2 backs it.
interface BlobStore {
  put: (
    key: string,
    body: BlobBody,
    options?: BlobPutOptions,
  ) => Promise<BlobRecord>
  // metadata + byte accessors; `options.range` reads one slice (for `206`s)
  get: (key: string, options?: BlobGetOptions) => Promise<BlobObject | null>
  head: (key: string) => Promise<BlobRecord | null> // metadata only
  delete: (key: string) => Promise<void> // no-op if absent
  list: (options?: BlobListOptions) => Promise<BlobListPage>
}

// ArtifactStore — the metadata layer. D1 backs it.
interface ArtifactStore {
  save: (record: ArtifactRecord) => Promise<void> // insert or overwrite
  get: (artifactId: string) => Promise<ArtifactRecord | null>
  list: (runId: string) => Promise<Array<ArtifactRecord>> // [] when none
  listForThread: (threadId: string) => Promise<Array<ArtifactRecord>>
  delete: (artifactId: string) => Promise<void>
  deleteForRun: (runId: string) => Promise<void>
}