Phase 7: OCI delete path for manifests and blobs

Manifest delete (DELETE /v2/<name>/manifests/<digest>): rejects tag
references with 405 UNSUPPORTED per OCI spec, cascades to tags and
manifest_blobs via ON DELETE CASCADE, returns 202 Accepted.

Blob delete (DELETE /v2/<name>/blobs/<digest>): removes manifest_blobs
associations only — blob row and file are preserved for GC to handle,
since other repos may reference the same content-addressed blob.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

PROGRESS.md

@@ -6,7 +6,7 @@ See `PROJECT_PLAN.md` for the implementation roadmap and
 
 ## Current State
 
-**Phase:** 6 complete, ready for Phase 7
+**Phase:** 7 complete, ready for Phase 9
 **Last updated:** 2026-03-19
 
 ### Completed
@@ -18,6 +18,7 @@ See `PROJECT_PLAN.md` for the implementation roadmap and
 - Phase 4: Policy engine (all 4 steps)
 - Phase 5: OCI pull path (all 5 steps)
 - Phase 6: OCI push path (all 3 steps)
+- Phase 7: OCI delete path (all 2 steps)
 - Phase 8: Admin REST API (all 5 steps)
 - `ARCHITECTURE.md` — Full design specification (18 sections)
 - `CLAUDE.md` — AI development guidance
@@ -26,14 +27,51 @@ See `PROJECT_PLAN.md` for the implementation roadmap and
 
 ### Next Steps
 
-1. Phase 7 (OCI delete)
-2. After Phase 7, Phase 9 (garbage collection)
-3. Phase 10 (gRPC admin API)
+1. Phase 9 (garbage collection)
+2. Phase 10 (gRPC admin API)
 
 ---
 
 ## Log
 
+### 2026-03-19 — Phase 7: OCI delete path
+
+**Task:** Implement manifest and blob deletion per OCI Distribution Spec.
+
+**Changes:**
+
+Step 7.1 — Manifest delete:
+- `db/delete.go`: `DeleteManifest(repoID, digest)` — deletes manifest
+  row; ON DELETE CASCADE handles manifest_blobs and tags
+- `oci/delete.go`: `handleManifestDelete()` — policy check
+  (registry:delete), rejects deletion by tag (405 UNSUPPORTED per OCI
+  spec), returns 202 Accepted, writes `manifest_deleted` audit event
+- Updated `oci/routes.go` dispatch to handle DELETE on manifests
+
+Step 7.2 — Blob delete:
+- `db/delete.go`: `DeleteBlobFromRepo(repoID, digest)` — removes
+  manifest_blobs associations only; does NOT delete the blob row or
+  file (GC's responsibility, since other repos may reference it)
+- `oci/delete.go`: `handleBlobDelete()` — policy check, returns 202,
+  writes `blob_deleted` audit event
+- Updated `oci/routes.go` dispatch to handle DELETE on blobs
+- Extended `DBQuerier` interface with delete methods
+
+**Verification:**
+- `make all` passes: vet clean, lint 0 issues, all tests passing,
+  all 3 binaries built
+- DB delete tests (5 new): delete manifest (verify cascade to tags and
+  manifest_blobs, blob row preserved), manifest not found, delete blob
+  from repo (manifest_blobs removed, blob row preserved, manifest
+  preserved), blob not found, blob exists globally but not in repo
+- OCI delete tests (8 new): manifest delete by digest (202), delete by
+  tag (405 UNSUPPORTED), manifest not found (404 MANIFEST_UNKNOWN),
+  repo not found (404 NAME_UNKNOWN), cascading tag deletion verified,
+  blob delete (202), blob not in repo (404 BLOB_UNKNOWN), blob delete
+  repo not found
+
+---
+
 ### 2026-03-19 — Phase 6: OCI push path
 
 **Task:** Implement blob uploads (monolithic and chunked) and manifest

PROJECT_PLAN.md

@@ -16,7 +16,7 @@ design specification.
 | 4 | Policy engine | **Complete** |
 | 5 | OCI API — pull path | **Complete** |
 | 6 | OCI API — push path | **Complete** |
-| 7 | OCI API — delete path | Not started |
+| 7 | OCI API — delete path | **Complete** |
 | 8 | Admin REST API | **Complete** |
 | 9 | Garbage collection | Not started |
 | 10 | gRPC admin API | Not started |

internal/db/delete.go

@@ -0,0 +1,62 @@
+package db
+
+import (
+	"database/sql"
+	"errors"
+	"fmt"
+)
+
+// DeleteManifest deletes the manifest with the given digest from a repository.
+// ON DELETE CASCADE handles manifest_blobs and tags rows.
+func (d *DB) DeleteManifest(repoID int64, digest string) error {
+	result, err := d.Exec(
+		`DELETE FROM manifests WHERE repository_id = ? AND digest = ?`,
+		repoID, digest,
+	)
+	if err != nil {
+		return fmt.Errorf("db: delete manifest: %w", err)
+	}
+	n, err := result.RowsAffected()
+	if err != nil {
+		return fmt.Errorf("db: delete manifest rows affected: %w", err)
+	}
+	if n == 0 {
+		return ErrManifestNotFound
+	}
+	return nil
+}
+
+// DeleteBlobFromRepo removes the manifest_blobs associations for a blob
+// in the given repository. It does NOT delete the blob row or file — that
+// is GC's job, since other repositories may reference the same blob.
+// Returns ErrBlobNotFound if the blob is not referenced in this repo.
+func (d *DB) DeleteBlobFromRepo(repoID int64, digest string) error {
+	// First check that the blob exists and is in this repo.
+	var blobID int64
+	err := d.QueryRow(`SELECT id FROM blobs WHERE digest = ?`, digest).Scan(&blobID)
+	if err != nil {
+		if errors.Is(err, sql.ErrNoRows) {
+			return ErrBlobNotFound
+		}
+		return fmt.Errorf("db: find blob: %w", err)
+	}
+
+	result, err := d.Exec(
+		`DELETE FROM manifest_blobs
+		 WHERE blob_id = ? AND manifest_id IN (
+		     SELECT id FROM manifests WHERE repository_id = ?
+		 )`,
+		blobID, repoID,
+	)
+	if err != nil {
+		return fmt.Errorf("db: delete blob from repo: %w", err)
+	}
+	n, err := result.RowsAffected()
+	if err != nil {
+		return fmt.Errorf("db: delete blob from repo rows affected: %w", err)
+	}
+	if n == 0 {
+		return ErrBlobNotFound
+	}
+	return nil
+}

internal/db/delete_test.go

@@ -0,0 +1,203 @@
+package db
+
+import (
+	"errors"
+	"testing"
+)
+
+func TestDeleteManifest(t *testing.T) {
+	d := openTestDB(t)
+	if err := d.Migrate(); err != nil {
+		t.Fatalf("Migrate: %v", err)
+	}
+
+	// Set up repo, manifest, tag, blob, manifest_blob.
+	_, err := d.Exec(`INSERT INTO repositories (name) VALUES ('testrepo')`)
+	if err != nil {
+		t.Fatalf("insert repo: %v", err)
+	}
+	_, err = d.Exec(`INSERT INTO manifests (repository_id, digest, media_type, content, size)
+		VALUES (1, 'sha256:m1', 'application/vnd.oci.image.manifest.v1+json', '{}', 2)`)
+	if err != nil {
+		t.Fatalf("insert manifest: %v", err)
+	}
+	_, err = d.Exec(`INSERT INTO tags (repository_id, name, manifest_id) VALUES (1, 'latest', 1)`)
+	if err != nil {
+		t.Fatalf("insert tag: %v", err)
+	}
+	_, err = d.Exec(`INSERT INTO blobs (digest, size) VALUES ('sha256:b1', 100)`)
+	if err != nil {
+		t.Fatalf("insert blob: %v", err)
+	}
+	_, err = d.Exec(`INSERT INTO manifest_blobs (manifest_id, blob_id) VALUES (1, 1)`)
+	if err != nil {
+		t.Fatalf("insert manifest_blob: %v", err)
+	}
+
+	// Delete the manifest.
+	if err := d.DeleteManifest(1, "sha256:m1"); err != nil {
+		t.Fatalf("DeleteManifest: %v", err)
+	}
+
+	// Verify manifest is gone.
+	_, err = d.GetManifestByDigest(1, "sha256:m1")
+	if !errors.Is(err, ErrManifestNotFound) {
+		t.Fatalf("expected ErrManifestNotFound, got %v", err)
+	}
+
+	// Verify tag was cascaded.
+	var tagCount int
+	if err := d.QueryRow(`SELECT COUNT(*) FROM tags`).Scan(&tagCount); err != nil {
+		t.Fatalf("count tags: %v", err)
+	}
+	if tagCount != 0 {
+		t.Fatalf("tag count: got %d, want 0", tagCount)
+	}
+
+	// Verify manifest_blobs was cascaded.
+	var mbCount int
+	if err := d.QueryRow(`SELECT COUNT(*) FROM manifest_blobs`).Scan(&mbCount); err != nil {
+		t.Fatalf("count manifest_blobs: %v", err)
+	}
+	if mbCount != 0 {
+		t.Fatalf("manifest_blobs count: got %d, want 0", mbCount)
+	}
+
+	// Verify blob row still exists (GC handles file cleanup).
+	var blobCount int
+	if err := d.QueryRow(`SELECT COUNT(*) FROM blobs`).Scan(&blobCount); err != nil {
+		t.Fatalf("count blobs: %v", err)
+	}
+	if blobCount != 1 {
+		t.Fatalf("blob count: got %d, want 1 (should not be deleted)", blobCount)
+	}
+}
+
+func TestDeleteManifestNotFound(t *testing.T) {
+	d := openTestDB(t)
+	if err := d.Migrate(); err != nil {
+		t.Fatalf("Migrate: %v", err)
+	}
+
+	_, err := d.Exec(`INSERT INTO repositories (name) VALUES ('testrepo')`)
+	if err != nil {
+		t.Fatalf("insert repo: %v", err)
+	}
+
+	err = d.DeleteManifest(1, "sha256:nonexistent")
+	if !errors.Is(err, ErrManifestNotFound) {
+		t.Fatalf("expected ErrManifestNotFound, got %v", err)
+	}
+}
+
+func TestDeleteBlobFromRepo(t *testing.T) {
+	d := openTestDB(t)
+	if err := d.Migrate(); err != nil {
+		t.Fatalf("Migrate: %v", err)
+	}
+
+	// Set up: repo, manifest, blob, manifest_blob.
+	_, err := d.Exec(`INSERT INTO repositories (name) VALUES ('testrepo')`)
+	if err != nil {
+		t.Fatalf("insert repo: %v", err)
+	}
+	_, err = d.Exec(`INSERT INTO manifests (repository_id, digest, media_type, content, size)
+		VALUES (1, 'sha256:m1', 'application/vnd.oci.image.manifest.v1+json', '{}', 2)`)
+	if err != nil {
+		t.Fatalf("insert manifest: %v", err)
+	}
+	_, err = d.Exec(`INSERT INTO blobs (digest, size) VALUES ('sha256:b1', 100)`)
+	if err != nil {
+		t.Fatalf("insert blob: %v", err)
+	}
+	_, err = d.Exec(`INSERT INTO manifest_blobs (manifest_id, blob_id) VALUES (1, 1)`)
+	if err != nil {
+		t.Fatalf("insert manifest_blob: %v", err)
+	}
+
+	// Delete blob from repo.
+	if err := d.DeleteBlobFromRepo(1, "sha256:b1"); err != nil {
+		t.Fatalf("DeleteBlobFromRepo: %v", err)
+	}
+
+	// Verify manifest_blobs is gone.
+	var mbCount int
+	if err := d.QueryRow(`SELECT COUNT(*) FROM manifest_blobs`).Scan(&mbCount); err != nil {
+		t.Fatalf("count manifest_blobs: %v", err)
+	}
+	if mbCount != 0 {
+		t.Fatalf("manifest_blobs count: got %d, want 0", mbCount)
+	}
+
+	// Verify blob row still exists (GC responsibility).
+	var blobCount int
+	if err := d.QueryRow(`SELECT COUNT(*) FROM blobs`).Scan(&blobCount); err != nil {
+		t.Fatalf("count blobs: %v", err)
+	}
+	if blobCount != 1 {
+		t.Fatalf("blob count: got %d, want 1", blobCount)
+	}
+
+	// Verify manifest still exists.
+	var mCount int
+	if err := d.QueryRow(`SELECT COUNT(*) FROM manifests`).Scan(&mCount); err != nil {
+		t.Fatalf("count manifests: %v", err)
+	}
+	if mCount != 1 {
+		t.Fatalf("manifest count: got %d, want 1", mCount)
+	}
+}
+
+func TestDeleteBlobFromRepoNotFound(t *testing.T) {
+	d := openTestDB(t)
+	if err := d.Migrate(); err != nil {
+		t.Fatalf("Migrate: %v", err)
+	}
+
+	_, err := d.Exec(`INSERT INTO repositories (name) VALUES ('testrepo')`)
+	if err != nil {
+		t.Fatalf("insert repo: %v", err)
+	}
+
+	// Blob doesn't exist at all.
+	err = d.DeleteBlobFromRepo(1, "sha256:nonexistent")
+	if !errors.Is(err, ErrBlobNotFound) {
+		t.Fatalf("expected ErrBlobNotFound, got %v", err)
+	}
+}
+
+func TestDeleteBlobFromRepoExistsGloballyButNotInRepo(t *testing.T) {
+	d := openTestDB(t)
+	if err := d.Migrate(); err != nil {
+		t.Fatalf("Migrate: %v", err)
+	}
+
+	// Two repos: blob only referenced in repo 2.
+	_, err := d.Exec(`INSERT INTO repositories (name) VALUES ('repo1')`)
+	if err != nil {
+		t.Fatalf("insert repo1: %v", err)
+	}
+	_, err = d.Exec(`INSERT INTO repositories (name) VALUES ('repo2')`)
+	if err != nil {
+		t.Fatalf("insert repo2: %v", err)
+	}
+	_, err = d.Exec(`INSERT INTO manifests (repository_id, digest, media_type, content, size)
+		VALUES (2, 'sha256:m2', 'application/vnd.oci.image.manifest.v1+json', '{}', 2)`)
+	if err != nil {
+		t.Fatalf("insert manifest: %v", err)
+	}
+	_, err = d.Exec(`INSERT INTO blobs (digest, size) VALUES ('sha256:shared', 500)`)
+	if err != nil {
+		t.Fatalf("insert blob: %v", err)
+	}
+	_, err = d.Exec(`INSERT INTO manifest_blobs (manifest_id, blob_id) VALUES (1, 1)`)
+	if err != nil {
+		t.Fatalf("insert manifest_blob: %v", err)
+	}
+
+	// Try to delete from repo1 — blob exists globally but not in repo1.
+	err = d.DeleteBlobFromRepo(1, "sha256:shared")
+	if !errors.Is(err, ErrBlobNotFound) {
+		t.Fatalf("expected ErrBlobNotFound for blob not in repo1, got %v", err)
+	}
+}

internal/oci/delete.go

@@ -0,0 +1,84 @@
+package oci
+
+import (
+	"errors"
+	"fmt"
+	"net/http"
+
+	"git.wntrmute.dev/kyle/mcr/internal/db"
+	"git.wntrmute.dev/kyle/mcr/internal/policy"
+)
+
+// handleManifestDelete handles DELETE /v2/<name>/manifests/<digest>.
+// Per OCI spec, deletion by tag is not supported — only by digest.
+func (h *Handler) handleManifestDelete(w http.ResponseWriter, r *http.Request, repo, reference string) {
+	if !h.checkPolicy(w, r, policy.ActionDelete, repo) {
+		return
+	}
+
+	// Reference must be a digest, not a tag.
+	if !isDigest(reference) {
+		writeOCIError(w, "UNSUPPORTED", http.StatusMethodNotAllowed,
+			"manifest deletion by tag is not supported; use digest")
+		return
+	}
+
+	repoID, err := h.db.GetRepositoryByName(repo)
+	if err != nil {
+		if errors.Is(err, db.ErrRepoNotFound) {
+			writeOCIError(w, "NAME_UNKNOWN", http.StatusNotFound,
+				fmt.Sprintf("repository %q not found", repo))
+			return
+		}
+		writeOCIError(w, "UNKNOWN", http.StatusInternalServerError, "internal error")
+		return
+	}
+
+	if err := h.db.DeleteManifest(repoID, reference); err != nil {
+		if errors.Is(err, db.ErrManifestNotFound) {
+			writeOCIError(w, "MANIFEST_UNKNOWN", http.StatusNotFound,
+				fmt.Sprintf("manifest %q not found", reference))
+			return
+		}
+		writeOCIError(w, "UNKNOWN", http.StatusInternalServerError, "internal error")
+		return
+	}
+
+	h.audit(r, "manifest_deleted", repo, reference)
+
+	w.WriteHeader(http.StatusAccepted)
+}
+
+// handleBlobDelete handles DELETE /v2/<name>/blobs/<digest>.
+// Removes manifest_blobs associations for this repo only. Does not delete
+// the blob row or file — that is GC's responsibility.
+func (h *Handler) handleBlobDelete(w http.ResponseWriter, r *http.Request, repo, digest string) {
+	if !h.checkPolicy(w, r, policy.ActionDelete, repo) {
+		return
+	}
+
+	repoID, err := h.db.GetRepositoryByName(repo)
+	if err != nil {
+		if errors.Is(err, db.ErrRepoNotFound) {
+			writeOCIError(w, "NAME_UNKNOWN", http.StatusNotFound,
+				fmt.Sprintf("repository %q not found", repo))
+			return
+		}
+		writeOCIError(w, "UNKNOWN", http.StatusInternalServerError, "internal error")
+		return
+	}
+
+	if err := h.db.DeleteBlobFromRepo(repoID, digest); err != nil {
+		if errors.Is(err, db.ErrBlobNotFound) {
+			writeOCIError(w, "BLOB_UNKNOWN", http.StatusNotFound,
+				fmt.Sprintf("blob %q not found in repository", digest))
+			return
+		}
+		writeOCIError(w, "UNKNOWN", http.StatusInternalServerError, "internal error")
+		return
+	}
+
+	h.audit(r, "blob_deleted", repo, digest)
+
+	w.WriteHeader(http.StatusAccepted)
+}

internal/oci/delete_test.go

@@ -0,0 +1,193 @@
+package oci
+
+import (
+	"encoding/json"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+)
+
+func TestManifestDeleteByDigest(t *testing.T) {
+	fdb := newFakeDB()
+	fdb.addRepo("myrepo", 1)
+	content := []byte(`{"schemaVersion":2}`)
+	fdb.addManifest(1, "latest", "sha256:aaaa", "application/vnd.oci.image.manifest.v1+json", content)
+
+	h := NewHandler(fdb, newFakeBlobs(), allowAll(), nil)
+	router := testRouter(h)
+
+	req := authedRequest("DELETE", "/v2/myrepo/manifests/sha256:aaaa", nil)
+	rr := httptest.NewRecorder()
+	router.ServeHTTP(rr, req)
+
+	if rr.Code != http.StatusAccepted {
+		t.Fatalf("status: got %d, want %d", rr.Code, http.StatusAccepted)
+	}
+
+	// Verify manifest was deleted from fakeDB.
+	_, err := fdb.GetManifestByDigest(1, "sha256:aaaa")
+	if err == nil {
+		t.Fatal("manifest should have been deleted")
+	}
+}
+
+func TestManifestDeleteByTagUnsupported(t *testing.T) {
+	fdb := newFakeDB()
+	fdb.addRepo("myrepo", 1)
+	content := []byte(`{"schemaVersion":2}`)
+	fdb.addManifest(1, "latest", "sha256:aaaa", "application/vnd.oci.image.manifest.v1+json", content)
+
+	h := NewHandler(fdb, newFakeBlobs(), allowAll(), nil)
+	router := testRouter(h)
+
+	req := authedRequest("DELETE", "/v2/myrepo/manifests/latest", nil)
+	rr := httptest.NewRecorder()
+	router.ServeHTTP(rr, req)
+
+	if rr.Code != http.StatusMethodNotAllowed {
+		t.Fatalf("status: got %d, want %d", rr.Code, http.StatusMethodNotAllowed)
+	}
+
+	var body ociErrorResponse
+	if err := json.NewDecoder(rr.Body).Decode(&body); err != nil {
+		t.Fatalf("decode error: %v", err)
+	}
+	if len(body.Errors) != 1 || body.Errors[0].Code != "UNSUPPORTED" {
+		t.Fatalf("error code: got %+v, want UNSUPPORTED", body.Errors)
+	}
+}
+
+func TestManifestDeleteNotFound(t *testing.T) {
+	fdb := newFakeDB()
+	fdb.addRepo("myrepo", 1)
+	// No manifests added.
+
+	h := NewHandler(fdb, newFakeBlobs(), allowAll(), nil)
+	router := testRouter(h)
+
+	req := authedRequest("DELETE", "/v2/myrepo/manifests/sha256:nonexistent", nil)
+	rr := httptest.NewRecorder()
+	router.ServeHTTP(rr, req)
+
+	if rr.Code != http.StatusNotFound {
+		t.Fatalf("status: got %d, want %d", rr.Code, http.StatusNotFound)
+	}
+
+	var body ociErrorResponse
+	if err := json.NewDecoder(rr.Body).Decode(&body); err != nil {
+		t.Fatalf("decode error: %v", err)
+	}
+	if len(body.Errors) != 1 || body.Errors[0].Code != "MANIFEST_UNKNOWN" {
+		t.Fatalf("error code: got %+v, want MANIFEST_UNKNOWN", body.Errors)
+	}
+}
+
+func TestManifestDeleteRepoNotFound(t *testing.T) {
+	fdb := newFakeDB()
+
+	h := NewHandler(fdb, newFakeBlobs(), allowAll(), nil)
+	router := testRouter(h)
+
+	req := authedRequest("DELETE", "/v2/nosuchrepo/manifests/sha256:aaaa", nil)
+	rr := httptest.NewRecorder()
+	router.ServeHTTP(rr, req)
+
+	if rr.Code != http.StatusNotFound {
+		t.Fatalf("status: got %d, want %d", rr.Code, http.StatusNotFound)
+	}
+
+	var body ociErrorResponse
+	if err := json.NewDecoder(rr.Body).Decode(&body); err != nil {
+		t.Fatalf("decode error: %v", err)
+	}
+	if len(body.Errors) != 1 || body.Errors[0].Code != "NAME_UNKNOWN" {
+		t.Fatalf("error code: got %+v, want NAME_UNKNOWN", body.Errors)
+	}
+}
+
+func TestManifestDeleteCascadesTag(t *testing.T) {
+	fdb := newFakeDB()
+	fdb.addRepo("myrepo", 1)
+	content := []byte(`{"schemaVersion":2}`)
+	fdb.addManifest(1, "latest", "sha256:aaaa", "application/vnd.oci.image.manifest.v1+json", content)
+
+	h := NewHandler(fdb, newFakeBlobs(), allowAll(), nil)
+	router := testRouter(h)
+
+	req := authedRequest("DELETE", "/v2/myrepo/manifests/sha256:aaaa", nil)
+	rr := httptest.NewRecorder()
+	router.ServeHTTP(rr, req)
+
+	if rr.Code != http.StatusAccepted {
+		t.Fatalf("status: got %d, want %d", rr.Code, http.StatusAccepted)
+	}
+
+	// The tag "latest" should also be gone (cascading delete in fakeDB).
+	_, err := fdb.GetManifestByTag(1, "latest")
+	if err == nil {
+		t.Fatal("tag 'latest' should have been cascaded on manifest delete")
+	}
+}
+
+func TestBlobDelete(t *testing.T) {
+	fdb := newFakeDB()
+	fdb.addRepo("myrepo", 1)
+	fdb.addBlob(1, "sha256:b1")
+
+	h := NewHandler(fdb, newFakeBlobs(), allowAll(), nil)
+	router := testRouter(h)
+
+	req := authedRequest("DELETE", "/v2/myrepo/blobs/sha256:b1", nil)
+	rr := httptest.NewRecorder()
+	router.ServeHTTP(rr, req)
+
+	if rr.Code != http.StatusAccepted {
+		t.Fatalf("status: got %d, want %d", rr.Code, http.StatusAccepted)
+	}
+
+	// Blob should be removed from repo in fakeDB.
+	exists, _ := fdb.BlobExistsInRepo(1, "sha256:b1")
+	if exists {
+		t.Fatal("blob should have been removed from repo")
+	}
+}
+
+func TestBlobDeleteNotInRepo(t *testing.T) {
+	fdb := newFakeDB()
+	fdb.addRepo("myrepo", 1)
+	// Blob not added to this repo.
+
+	h := NewHandler(fdb, newFakeBlobs(), allowAll(), nil)
+	router := testRouter(h)
+
+	req := authedRequest("DELETE", "/v2/myrepo/blobs/sha256:nonexistent", nil)
+	rr := httptest.NewRecorder()
+	router.ServeHTTP(rr, req)
+
+	if rr.Code != http.StatusNotFound {
+		t.Fatalf("status: got %d, want %d", rr.Code, http.StatusNotFound)
+	}
+
+	var body ociErrorResponse
+	if err := json.NewDecoder(rr.Body).Decode(&body); err != nil {
+		t.Fatalf("decode error: %v", err)
+	}
+	if len(body.Errors) != 1 || body.Errors[0].Code != "BLOB_UNKNOWN" {
+		t.Fatalf("error code: got %+v, want BLOB_UNKNOWN", body.Errors)
+	}
+}
+
+func TestBlobDeleteRepoNotFound(t *testing.T) {
+	fdb := newFakeDB()
+
+	h := NewHandler(fdb, newFakeBlobs(), allowAll(), nil)
+	router := testRouter(h)
+
+	req := authedRequest("DELETE", "/v2/nosuchrepo/blobs/sha256:b1", nil)
+	rr := httptest.NewRecorder()
+	router.ServeHTTP(rr, req)
+
+	if rr.Code != http.StatusNotFound {
+		t.Fatalf("status: got %d, want %d", rr.Code, http.StatusNotFound)
+	}
+}

internal/oci/handler.go

@@ -31,6 +31,10 @@ type DBQuerier interface {
 	GetUpload(uuid string) (*db.UploadRow, error)
 	UpdateUploadOffset(uuid string, offset int64) error
 	DeleteUpload(uuid string) error
+
+	// Delete operations
+	DeleteManifest(repoID int64, digest string) error
+	DeleteBlobFromRepo(repoID int64, digest string) error
 }
 
 // BlobStore provides read and write access to blob storage.

internal/oci/handler_test.go

@@ -207,6 +207,34 @@ func (f *fakeDB) DeleteUpload(uuid string) error {
 	return nil
 }
 
+func (f *fakeDB) DeleteManifest(repoID int64, digest string) error {
+	f.mu.Lock()
+	defer f.mu.Unlock()
+	key := manifestKey{repoID, digest}
+	if _, ok := f.manifests[key]; !ok {
+		return db.ErrManifestNotFound
+	}
+	delete(f.manifests, key)
+	// Also remove any tag entries pointing to this digest.
+	for k, m := range f.manifests {
+		if k.repoID == repoID && m.Digest == digest {
+			delete(f.manifests, k)
+		}
+	}
+	return nil
+}
+
+func (f *fakeDB) DeleteBlobFromRepo(repoID int64, digest string) error {
+	f.mu.Lock()
+	defer f.mu.Unlock()
+	digests, ok := f.blobs[repoID]
+	if !ok || !digests[digest] {
+		return db.ErrBlobNotFound
+	}
+	delete(digests, digest)
+	return nil
+}
+
 // addRepo adds a repo to the fakeDB and returns its ID.
 func (f *fakeDB) addRepo(name string, id int64) {
 	f.repos[name] = id

internal/oci/routes.go

@@ -113,8 +113,10 @@ func (h *Handler) dispatch(w http.ResponseWriter, r *http.Request) {
 			h.handleManifestHead(w, r, info.name, info.reference)
 		case http.MethodPut:
 			h.handleManifestPut(w, r, info.name, info.reference)
+		case http.MethodDelete:
+			h.handleManifestDelete(w, r, info.name, info.reference)
 		default:
-			w.Header().Set("Allow", "GET, HEAD, PUT")
+			w.Header().Set("Allow", "GET, HEAD, PUT, DELETE")
 			writeOCIError(w, "UNSUPPORTED", http.StatusMethodNotAllowed, "method not allowed")
 		}
 	case "blobs":
@@ -123,8 +125,10 @@ func (h *Handler) dispatch(w http.ResponseWriter, r *http.Request) {
 			h.handleBlobGet(w, r, info.name, info.reference)
 		case http.MethodHead:
 			h.handleBlobHead(w, r, info.name, info.reference)
+		case http.MethodDelete:
+			h.handleBlobDelete(w, r, info.name, info.reference)
 		default:
-			w.Header().Set("Allow", "GET, HEAD")
+			w.Header().Set("Allow", "GET, HEAD, DELETE")
 			writeOCIError(w, "UNSUPPORTED", http.StatusMethodNotAllowed, "method not allowed")
 		}
 	case "uploads":