diff --git a/src/lib/backend/errors.test.ts b/src/lib/backend/errors.test.ts
index 0dea3609..c0144908 100644
--- a/src/lib/backend/errors.test.ts
+++ b/src/lib/backend/errors.test.ts
@@ -12,7 +12,6 @@ import {
   InternalError,
   BackendError,
   normalizeBackendError,
-  HTTP_ERROR_CODES,
 } from './errors';
 import { ERROR_CODE_REGISTRY } from './errorCodes';
 
@@ -123,24 +122,17 @@ describe('Other error classes — no retryAfter', () => {
   });
 });
 
-describe('HTTP_ERROR_CODES', () => {
-  it('should include 429 with TOO_MANY_REQUESTS', () => {
-    expect(HTTP_ERROR_CODES[429]).toBe('TOO_MANY_REQUESTS');
-  });
+describe('HTTP_ERROR_CODES removal', () => {
+  it('no longer exports the deprecated HTTP status map', async () => {
+    const errorsModule = await import('./errors');
 
-  it('should include 503 with SERVICE_UNAVAILABLE', () => {
-    expect(HTTP_ERROR_CODES[503]).toBe('SERVICE_UNAVAILABLE');
+    expect('HTTP_ERROR_CODES' in errorsModule).toBe(false);
   });
 
-  it('should include all standard error codes', () => {
-    expect(HTTP_ERROR_CODES[400]).toBe('BAD_REQUEST');
-    expect(HTTP_ERROR_CODES[401]).toBe('UNAUTHORIZED');
-    expect(HTTP_ERROR_CODES[403]).toBe('FORBIDDEN');
-    expect(HTTP_ERROR_CODES[404]).toBe('NOT_FOUND');
-    expect(HTTP_ERROR_CODES[409]).toBe('CONFLICT');
-    expect(HTTP_ERROR_CODES[500]).toBe('INTERNAL_ERROR');
-    expect(HTTP_ERROR_CODES[502]).toBe('BAD_GATEWAY');
-    expect(HTTP_ERROR_CODES[504]).toBe('GATEWAY_TIMEOUT');
+  it('keeps ERROR_CODE_REGISTRY as the single error-code source of truth', async () => {
+    const errorsModule = await import('./errors');
+
+    expect(errorsModule.ERROR_CODE_REGISTRY).toBe(ERROR_CODE_REGISTRY);
   });
 });
 
diff --git a/src/lib/backend/errors.ts b/src/lib/backend/errors.ts
index 62a617b9..1d1b2798 100644
--- a/src/lib/backend/errors.ts
+++ b/src/lib/backend/errors.ts
@@ -122,31 +122,6 @@ export class InternalError extends ApiError {
   }
 }
 
-// ─── HTTP status → error code mapping ───────────────────────────────────────
-
-/**
- * Map of HTTP status codes to their canonical error code strings.
- *
- * @deprecated Use ERROR_CODE_REGISTRY from errorCodes.ts for detailed error
- * documentation including meaning, client handling, and retriable status.
- *
- * @see ERROR_CODE_REGISTRY
- */
-export const HTTP_ERROR_CODES: Record<number, string> = {
-  400: 'BAD_REQUEST',
-  401: 'UNAUTHORIZED',
-  403: 'FORBIDDEN',
-  404: 'NOT_FOUND',
-  409: 'CONFLICT',
-  413: 'PAYLOAD_TOO_LARGE',
-  422: 'UNPROCESSABLE_ENTITY',
-  429: 'TOO_MANY_REQUESTS',
-  500: 'INTERNAL_ERROR',
-  502: 'BAD_GATEWAY',
-  503: 'SERVICE_UNAVAILABLE',
-  504: 'GATEWAY_TIMEOUT',
-};
-
 // ─── Legacy BackendError (kept for backward compatibility) ────────────────────
 
 export type BackendErrorCode =