sync errors

sync.py

@@ -7,7 +7,7 @@ import config
 import db
 import extractor
 import sftp as sftp_module
-from uploader import CalibreClient
+from uploader import CalibreClient, CalibreUnavailableError
 
 log = logging.getLogger(__name__)
 
@@ -86,6 +86,7 @@ def run_sync(limit: int | None = None) -> None:
                         t2 = time.monotonic()
                         status = client.upload(book, zip_source=remote_zip.remote_path)
                         log.info("Upload '%s' → %s (%.1fs)", book.name, status, time.monotonic() - t2)
+                        time.sleep(2)
                         if status == "uploaded":
                             counters["books_uploaded"] += 1
                         elif status == "skipped_duplicate":
@@ -99,6 +100,11 @@ def run_sync(limit: int | None = None) -> None:
                         zip_error = f"{books_errored_this_zip} book upload(s) failed — will retry next sync"
 
                     extractor.cleanup(work_dir / "extracted" / local_zip.stem)
+                except CalibreUnavailableError as e:
+                    log.error("Calibre-Web unavailable — aborting sync run: %s", e)
+                    db.mark_zip_processed(remote_zip.remote_path, remote_zip.file_size, "error", str(e))
+                    db.finish_sync_run(run_id, status="error", error_msg=str(e), **counters)
+                    return
                 except Exception as e:
                     log.error("Error processing %s: %s", remote_zip.remote_path, e)
                     zip_status = "error"