sync errors

sync.py

@@ -1,5 +1,6 @@
 import logging
 import threading
+import time
 from pathlib import Path
 
 import config
@@ -72,11 +73,18 @@ def run_sync(limit: int | None = None) -> None:
                 zip_error = None
                 local_zip = None
                 try:
+                    t0 = time.monotonic()
                     local_zip = sftp_module.download(cfg.sftp, remote_zip, str(work_dir / "downloads"))
+                    log.info("Download done in %.1fs (%.1f MB)", time.monotonic() - t0, local_zip.stat().st_size / 1_048_576)
+
+                    t1 = time.monotonic()
                     books = extractor.extract(local_zip, work_dir / "extracted")
+                    log.info("Extract done in %.1fs — %d book(s)", time.monotonic() - t1, len(books))
 
                     for book in books:
+                        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)
                         if status == "uploaded":
                             counters["books_uploaded"] += 1
                         elif status == "skipped_duplicate":