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This is the right change for the stated problem. Uploading to storage backends that cannot produce signed URLs — especially the native Cloudflare R2 binding — needs a same-origin streaming fallback, and the PR adds that path without breaking the S3-style signed-URL flow. The atomic publish-via-upload-attempt table, the cleanup ordering (DB row deleted before storage object), and the size/MIME/hash guards are all sound and well covered by tests.

I reviewed the full diff, the changed routes, the repository/Clean-up code, the admin client, the migration, the OpenAPI updates, and the regression tests. No blocking logic bug, regression, security issue, or AGENTS.md convention violation stood out. The only things I noticed are two comment blocks that drift into PR-style narrative rather than code explanations — worth tightening before merge, but not blockers.

Findings

• [suggestion] packages/core/src/astro/routes/api/media/[id]/confirm.ts:187-194

  This comment block narrates the PR’s rationale ("the signed-URL flow uploads directly to storage, so this confirm is the only point at which the server sees the bytes", "buffering a large original into a Worker heap to compute a 32px blurhash would OOM"). It repeats design trade-offs that belong in the PR description rather than the code. Per AGENTS.md, comments should explain non-obvious invariants, not re-state the change proposal.

  		// LQIP is best-effort; oversized images skip server-side placeholders.
  

• [suggestion] packages/admin/src/lib/api/media.ts:16-19

  The constant name already says what it is; the surrounding JSDoc justifies it by pointing at a remote schema and asks readers to "keep in sync". Cross-file notes that require manual synchronization age quickly and violate the comment-discipline rule against justification/narrative. If both sides need the same limit, export it from a shared package; otherwise the name is enough.

  export const MEDIA_SEARCH_MAX_LENGTH = 200;
  

This is the right change for the stated problem and the latest revision is clean. The same-origin streaming fallback lets native R2/local storage work without signed URLs, while the S3 signed-URL flow is preserved. The atomic publishPendingStorageKey update, the upload-attempt cleanup table, and the delete-before-storage cleanup ordering all prevent the races this PR targets. MIME-type/size guards on deduplication, optional client hashing, and the 8 MiB LQIP cap are sensible.

I re-read the full diff plus the changed routes, repository, cleanup code, admin client, migration, OpenAPI document, and regression tests. Both comment-style findings from the previous review are fixed: confirm.ts now has only the concise LQIP invariant, and the stale cross-file JSDoc on MEDIA_SEARCH_MAX_LENGTH is gone.

No new blocking logic bug, regression, security issue, or AGENTS.md convention violation stands out. The OpenAPI schema for POST /media/upload-url correctly models the union of upload-target and existing-media responses, the migration indexes follow naming conventions, authorization uses the existing media:upload/media:edit_any permissions, and the extensive concurrency/race test coverage exercises the publication, retry, cleanup, and deletion paths.

Re-review: no new blockers

This is the right change for the stated problem. The same-origin streaming fallback lets native R2/local storage work without signed URLs, while the S3 signed-URL flow is preserved. The atomic publishPendingStorageKey update, the upload-attempt cleanup table, and the delete-before-storage cleanup ordering all prevent the races this PR targets. MIME-type/size guards on deduplication, optional client hashing, and the 8 MiB LQIP cap remain sensible.

I re-read the full diff plus the changed routes, repository, cleanup code, admin client, migration, OpenAPI document, and regression tests. Both comment-style findings from the previous review are still fixed: confirm.ts has only the concise LQIP invariant, and the stale cross-file JSDoc on MEDIA_SEARCH_MAX_LENGTH is gone.

No new blocking logic bug, regression, security issue, or AGENTS.md convention violation stands out in this revision. The OpenAPI schema for POST /media/upload-url continues to model the union of upload-target and existing-media responses correctly, migration indexes follow naming conventions, authorization uses the existing media:upload/media:edit_any permissions, and the concurrency/race test coverage exercises the publication, retry, cleanup, and deletion paths.

LGTM.