Apply ruff fixes

app/models/unc_thread.py

@@ -6,7 +6,7 @@ from sqlalchemy.orm import Mapped, mapped_column
 from app.core.database import Base
 
 
-class UncSeries(str, enum.Enum):
+class UncSeries(enum.StrEnum):
     UNC = "UNC"
     UNF = "UNF"
     UNEF = "UNEF"