content: """Add heartbeat column for step runs [a5a17015b681].
  
  Revision ID: a5a17015b681
  Revises: af27025fe19c
  Create Date: 2025-10-13 12:24:12.470803
  
  """
  
  import sqlalchemy as sa
  from alembic import op
  
  # revision identifiers, used by Alembic.
  revision = "a5a17015b681"
  down_revision = "af27025fe19c"
  branch_labels = None
  depends_on = None
  
  
  def upgrade() -> None:
      """Upgrade database schema and/or data, creating a new revision."""
      with op.batch_alter_table("step_run", schema=None) as batch_op:
          batch_op.add_column(
              sa.Column("latest_heartbeat", sa.DateTime(), nullable=True)
          )
  
  
  def downgrade() -> None:
      """Downgrade database schema and/or data back to the previous revision."""
      with op.batch_alter_table("step_run", schema=None) as batch_op:
          batch_op.drop_column("latest_heartbeat")
  