sync errors

sync.py

@@ -81,6 +81,7 @@ def run_sync(limit: int | None = None) -> None:
                     books = extractor.extract(local_zip, work_dir / "extracted")
                     log.info("Extract done in %.1fs — %d book(s)", time.monotonic() - t1, len(books))
 
+                    books_errored_this_zip = 0
                     for book in books:
                         t2 = time.monotonic()
                         status = client.upload(book, zip_source=remote_zip.remote_path)
@@ -91,6 +92,11 @@ def run_sync(limit: int | None = None) -> None:
                             counters["books_skipped"] += 1
                         else:
                             counters["books_errored"] += 1
+                            books_errored_this_zip += 1
+
+                    if books_errored_this_zip:
+                        zip_status = "error"
+                        zip_error = f"{books_errored_this_zip} book upload(s) failed — will retry next sync"
 
                     extractor.cleanup(work_dir / "extracted" / local_zip.stem)
                 except Exception as e: