diff --git a/app/database.py b/app/database.py
index 43f552a..6878171 100644
--- a/app/database.py
+++ b/app/database.py
@@ -62,7 +62,7 @@ class TrackedSeries(Base):
     rating = Column(String, nullable=True)           # MangaBaka aggregated
     mu_rating = Column(Float, nullable=True)         # MangaUpdates bayesian rating (0-10)
     mu_rating_votes = Column(Integer, nullable=True)
-    user_rating = Column(Float, nullable=True)       # User's personal rating (0-10, integers)
+    user_rating = Column(Float, nullable=True)       # User's personal rating (0-10, 0.5 increments)
 
     # ── Chapter / release tracking ────────────────────────────────────
     total_chapters = Column(String, nullable=True)       # MB chapter count — unreliable per dev; last-resort fallback only
diff --git a/app/main.py b/app/main.py
index 7331eba..445b205 100644
--- a/app/main.py
+++ b/app/main.py
@@ -430,9 +430,14 @@ def komga_import(req: KomgaImportRequest, background_tasks: BackgroundTasks):
 
 @app.get("/api/komga/import/progress")
 def komga_import_progress():
-    """Poll this endpoint during a Komga import to show live progress."""
-    with _komga_import_lock:
-        return dict(_komga_import_progress)
+    """Poll this endpoint during a Komga import to show live progress.
+
+    Deliberately does NOT acquire _komga_import_lock — the running import holds
+    that lock for its full duration, so taking it here would block every poll
+    until the import finished, defeating live progress. Reading the plain dict
+    is atomic enough for progress display.
+    """
+    return dict(_komga_import_progress)
 
 
 def _schedule_mu_lookup(background_tasks: BackgroundTasks, series_id: int, title: str):
@@ -482,7 +487,7 @@ def _do_lookup():
                 series.genres = json.dumps(merged)
 
             # Authors
-            mu_authors = [a.get("name") for a in mu_data.get("authors", []) if a.get("name")]
+            mu_authors = [a.get("author_name") for a in mu_data.get("authors", []) if a.get("author_name")]
             if mu_authors and not series.authors:
                 series.authors = json.dumps(mu_authors)
 
diff --git a/app/scheduler.py b/app/scheduler.py
index 0d24bc3..34f563e 100644
--- a/app/scheduler.py
+++ b/app/scheduler.py
@@ -339,7 +339,7 @@ def _maybe_notify_poll_failure(db: "Session", series: TrackedSeries):
         return
     # Only fire at exact powers of 2 of the threshold to avoid spamming
     ratio = failures // threshold
-    if ratio & (ratio - 1) != 0:
+    if (ratio & (ratio - 1)) != 0:
         return
     user_key, app_token, pushover_enabled = get_pushover_creds(db)
     if not pushover_enabled or not user_key or not app_token:
@@ -1496,15 +1496,15 @@ def _poll_komga(db: Session, series_list: list[TrackedSeries]):
 
         except KomgaAuthError:
             logger.error("Komga: API key is invalid — check Settings")
-            # Mark all remaining Komga series as failed before breaking
-            for s in series_list:
-                _mark_poll_failure(s, "API key invalid", db)
+            # Global failure — mark only the current series; don't taint series
+            # already polled successfully this run. The rest are simply left for
+            # the next cycle rather than recorded as failures they never hit.
+            _mark_poll_failure(series, "API key invalid", db)
             db.commit()
             break
         except KomgaConnectionError as e:
             logger.error(f"Komga: server unreachable — {e}")
-            for s in series_list:
-                _mark_poll_failure(s, f"Server unreachable: {e}", db)
+            _mark_poll_failure(series, f"Server unreachable: {e}", db)
             db.commit()
             break
         except KomgaNotFound: