content: """Dynamic pipelines [af27025fe19c].
  
  Revision ID: af27025fe19c
  Revises: 0.91.0
  Create Date: 2025-10-27 13:23:40.442485
  
  """
  
  import sqlalchemy as sa
  import sqlmodel
  from alembic import op
  
  # revision identifiers, used by Alembic.
  revision = "af27025fe19c"
  down_revision = "0.91.0"
  branch_labels = None
  depends_on = None
  
  
  def upgrade() -> None:
      """Upgrade database schema and/or data, creating a new revision."""
      # ### commands auto generated by Alembic - please adjust! ###
      with op.batch_alter_table("pipeline_snapshot", schema=None) as batch_op:
          batch_op.add_column(
              sa.Column("is_dynamic", sa.Boolean(), nullable=True)
          )
  
      op.execute(
          "UPDATE pipeline_snapshot SET is_dynamic = FALSE WHERE is_dynamic IS NULL"
      )
      with op.batch_alter_table("pipeline_snapshot", schema=None) as batch_op:
          batch_op.alter_column(
              "is_dynamic", existing_type=sa.Boolean(), nullable=False
          )
  
      with op.batch_alter_table("step_configuration", schema=None) as batch_op:
          batch_op.add_column(
              sa.Column(
                  "step_run_id", sqlmodel.sql.sqltypes.GUID(), nullable=True
              )
          )
          batch_op.alter_column(
              "snapshot_id", existing_type=sa.CHAR(length=32), nullable=True
          )
          batch_op.create_unique_constraint(
              "unique_step_configuration_for_snapshot_or_step_run",
              ["snapshot_id", "step_run_id", "name"],
          )
          batch_op.drop_constraint(
              "unique_step_name_for_snapshot", type_="unique"
          )
          batch_op.create_foreign_key(
              "fk_step_configuration_step_run_id_step_run",
              "step_run",
              ["step_run_id"],
              ["id"],
              ondelete="CASCADE",
          )
  
          batch_op.create_check_constraint(
              "ck_step_configuration_snapshot_step_run_exclusivity",
              "((snapshot_id IS NULL AND step_run_id IS NOT NULL) OR "
              "(snapshot_id IS NOT NULL AND step_run_id IS NULL))",
          )
  
      # ### end Alembic commands ###
  
  
  def downgrade() -> None:
      """Downgrade database schema and/or data back to the previous revision."""
      # ### commands auto generated by Alembic - please adjust! ###
      op.drop_constraint(
          "ck_step_configuration_snapshot_step_run_exclusivity",
          "step_configuration",
          type_="check",
      )
      with op.batch_alter_table("step_configuration", schema=None) as batch_op:
          batch_op.drop_constraint(
              "fk_step_configuration_step_run_id_step_run", type_="foreignkey"
          )
          batch_op.drop_constraint(
              "unique_step_name_for_snapshot", type_="unique"
          )
          batch_op.create_unique_constraint(
              "unique_step_name_for_snapshot", ["snapshot_id", "name"]
          )
          batch_op.alter_column(
              "snapshot_id", existing_type=sa.CHAR(length=32), nullable=False
          )
          batch_op.drop_column("step_run_id")
  
      with op.batch_alter_table("pipeline_snapshot", schema=None) as batch_op:
          batch_op.drop_column("is_dynamic")
  
      # ### end Alembic commands ###
  