Add covers

backend/alembic/versions/019_add_marathon_cover.py

@@ -0,0 +1,36 @@
+"""Add marathon cover_url field
+
+Revision ID: 019_add_marathon_cover
+Revises: 018_seed_static_content
+Create Date: 2024-12-21
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+from sqlalchemy import inspect
+
+
+# revision identifiers, used by Alembic.
+revision: str = '019_add_marathon_cover'
+down_revision: Union[str, None] = '018_seed_static_content'
+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:
+    if not column_exists('marathons', 'cover_url'):
+        op.add_column('marathons', sa.Column('cover_url', sa.String(500), nullable=True))
+
+
+def downgrade() -> None:
+    if column_exists('marathons', 'cover_url'):
+        op.drop_column('marathons', 'cover_url')