Apply ruff fixes

alembic/versions/627d4460a94f_add_iso_threads_table.py

@@ -6,16 +6,15 @@ Create Date: 2026-06-24 21:50:05.340235
 """
 
 from collections.abc import Sequence
-from typing import Union
 
 import sqlalchemy as sa
 
 from alembic import op
 
 revision: str = "627d4460a94f"
-down_revision: Union[str, None] = "0001_initial"
-branch_labels: Union[str, Sequence[str], None] = None
-depends_on: Union[str, Sequence[str], None] = None
+down_revision: str | None = "0001_initial"
+branch_labels: str | Sequence[str] | None = None
+depends_on: str | Sequence[str] | None = None
 
 
 def upgrade() -> None: