feat: add option to control leaderboard visibility during contests

backend/alembic/versions/005_add_leaderboard_visibility.py

@@ -0,0 +1,25 @@
+"""Add show_leaderboard_during_contest to contests
+
+Revision ID: 005
+Revises: 004
+Create Date: 2025-11-30
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+
+
+revision: str = '005'
+down_revision: Union[str, None] = '004'
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    op.add_column('contests', sa.Column('show_leaderboard_during_contest', sa.Boolean(), nullable=False, server_default='false'))
+
+
+def downgrade() -> None:
+    op.drop_column('contests', 'show_leaderboard_during_contest')