content: """Add model version producer run unique constraint [a1237ba94fd8].
  
  Revision ID: a1237ba94fd8
  Revises: 26351d482b9e
  Create Date: 2024-12-13 10:28:55.432414
  
  """
  
  import sqlalchemy as sa
  import sqlmodel
  from alembic import op
  
  # revision identifiers, used by Alembic.
  revision = "a1237ba94fd8"
  down_revision = "26351d482b9e"
  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("model_version", schema=None) as batch_op:
          batch_op.add_column(
              sa.Column(
                  "producer_run_id_if_numeric",
                  sqlmodel.sql.sqltypes.GUID(),
                  nullable=True,
              )
          )
  
      # Set the producer_run_id_if_numeric column to the model version ID for
      # existing rows
      connection = op.get_bind()
      metadata = sa.MetaData()
      metadata.reflect(only=("model_version",), bind=connection)
      model_version_table = sa.Table("model_version", metadata)
  
      connection.execute(
          model_version_table.update().values(
              producer_run_id_if_numeric=model_version_table.c.id
          )
      )
  
      with op.batch_alter_table("model_version", schema=None) as batch_op:
          batch_op.alter_column(
              "producer_run_id_if_numeric",
              existing_type=sqlmodel.sql.sqltypes.GUID(),
              nullable=False,
          )
          batch_op.create_unique_constraint(
              "unique_numeric_version_for_pipeline_run",
              ["model_id", "producer_run_id_if_numeric"],
          )
  
      # ### end Alembic commands ###
  
  
  def downgrade() -> None:
      """Downgrade database schema and/or data back to the previous revision."""
      # ### commands auto generated by Alembic - please adjust! ###
      with op.batch_alter_table("model_version", schema=None) as batch_op:
          batch_op.drop_constraint(
              "unique_numeric_version_for_pipeline_run", type_="unique"
          )
          batch_op.drop_column("producer_run_id_if_numeric")
  
      # ### end Alembic commands ###
  