Fix migrations

backend/alembic/versions/002_marathon_settings.py

@@ -9,6 +9,7 @@ from typing import Sequence, Union
 
 from alembic import op
 import sqlalchemy as sa
+from sqlalchemy import inspect
 
 # revision identifiers, used by Alembic.
 revision: str = '002_marathon_settings'
@@ -17,16 +18,27 @@ branch_labels: Union[str, Sequence[str], None] = None
 depends_on: Union[str, Sequence[str], None] = None
 
 
+def column_exists(table_name: str, column_name: str) -> bool:
+    bind = op.get_bind()
+    inspector = inspect(bind)
+    columns = [col['name'] for col in inspector.get_columns(table_name)]
+    return column_name in columns
+
+
 def upgrade() -> None:
     # Add is_public column to marathons table (default False = private)
-    op.add_column('marathons', sa.Column('is_public', sa.Boolean(), nullable=False, server_default='false'))
+    if not column_exists('marathons', 'is_public'):
+        op.add_column('marathons', sa.Column('is_public', sa.Boolean(), nullable=False, server_default='false'))
 
     # Add game_proposal_mode column to marathons table
     # 'all_participants' - anyone can propose games (with moderation)
     # 'organizer_only' - only organizers can add games
-    op.add_column('marathons', sa.Column('game_proposal_mode', sa.String(20), nullable=False, server_default='all_participants'))
+    if not column_exists('marathons', 'game_proposal_mode'):
+        op.add_column('marathons', sa.Column('game_proposal_mode', sa.String(20), nullable=False, server_default='all_participants'))
 
 
 def downgrade() -> None:
-    op.drop_column('marathons', 'game_proposal_mode')
-    op.drop_column('marathons', 'is_public')
+    if column_exists('marathons', 'game_proposal_mode'):
+        op.drop_column('marathons', 'game_proposal_mode')
+    if column_exists('marathons', 'is_public'):
+        op.drop_column('marathons', 'is_public')