content: """polymorthic run_metadata [8ed03137cacc].
  
  Revision ID: 8ed03137cacc
  Revises: a91762e6be36
  Create Date: 2023-11-17 16:19:34.281692
  
  """
  
  import sqlalchemy as sa
  import sqlmodel
  from alembic import op
  from sqlmodel import Session
  
  # revision identifiers, used by Alembic.
  revision = "8ed03137cacc"
  down_revision = "a91762e6be36"
  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("run_metadata", schema=None) as batch_op:
          batch_op.add_column(
              sa.Column("resource_type", sa.VARCHAR(length=255), nullable=True)
          )
          batch_op.add_column(
              sa.Column(
                  "resource_id", sqlmodel.sql.sqltypes.GUID(), nullable=True
              )
          )
          batch_op.drop_constraint(
              "fk_run_metadata_step_run_id_step_run", type_="foreignkey"
          )
          batch_op.drop_constraint(
              "fk_run_metadata_artifact_version_id_artifact_version",
              type_="foreignkey",
          )
          batch_op.drop_constraint(
              "fk_run_metadata_pipeline_run_id_pipeline_run", type_="foreignkey"
          )
  
      with Session(bind=op.get_bind()) as session:
          stmt = sa.text(
              """
              UPDATE run_metadata
              SET resource_id = pipeline_run_id,
                  resource_type = 'pipeline_run'
              WHERE pipeline_run_id IS NOT NULL
              """
          )
          session.execute(stmt)
          stmt = sa.text(
              """
              UPDATE run_metadata
              SET resource_id = step_run_id,
                  resource_type = 'step_run'
              WHERE step_run_id IS NOT NULL
              """
          )
          session.execute(stmt)
          stmt = sa.text(
              """
              UPDATE run_metadata
              SET resource_id = artifact_version_id,
                  resource_type = 'artifact_version'
              WHERE artifact_version_id IS NOT NULL
              """
          )
          session.execute(stmt)
          session.commit()
  
      with op.batch_alter_table("run_metadata", schema=None) as batch_op:
          batch_op.alter_column(
              "resource_type",
              existing_type=sa.VARCHAR(length=255),
              existing_nullable=True,
              nullable=False,
          )
          batch_op.alter_column(
              "resource_id",
              existing_type=sqlmodel.sql.sqltypes.GUID(),
              existing_nullable=True,
              nullable=False,
          )
          batch_op.drop_column("step_run_id")
          batch_op.drop_column("artifact_version_id")
          batch_op.drop_column("pipeline_run_id")
  
      # ### 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("run_metadata", schema=None) as batch_op:
          batch_op.add_column(
              sa.Column("pipeline_run_id", sa.CHAR(length=32), nullable=True)
          )
          batch_op.add_column(
              sa.Column("artifact_version_id", sa.CHAR(length=32), nullable=True)
          )
          batch_op.add_column(
              sa.Column("step_run_id", sa.CHAR(length=32), nullable=True)
          )
          batch_op.create_foreign_key(
              "fk_run_metadata_pipeline_run_id_pipeline_run",
              "pipeline_run",
              ["pipeline_run_id"],
              ["id"],
              ondelete="CASCADE",
          )
          batch_op.create_foreign_key(
              "fk_run_metadata_artifact_version_id_artifact_version",
              "artifact_version",
              ["artifact_version_id"],
              ["id"],
              ondelete="CASCADE",
          )
          batch_op.create_foreign_key(
              "fk_run_metadata_step_run_id_step_run",
              "step_run",
              ["step_run_id"],
              ["id"],
              ondelete="CASCADE",
          )
  
      with Session(bind=op.get_bind()) as session:
          stmt = sa.text(
              """
              UPDATE run_metadata
              SET pipeline_run_id = resource_id
              WHERE resource_type = 'pipeline_run'
              """
          )
          session.execute(stmt)
          stmt = sa.text(
              """
              UPDATE run_metadata
              SET step_run_id = resource_id
              WHERE resource_type = 'step_run'
              """
          )
          session.execute(stmt)
          stmt = sa.text(
              """
              UPDATE run_metadata
              SET artifact_version_id = resource_id
              WHERE resource_type = 'artifact_version'
              """
          )
          session.execute(stmt)
          session.commit()
  
      with op.batch_alter_table("run_metadata", schema=None) as batch_op:
          batch_op.drop_column("resource_id")
          batch_op.drop_column("resource_type")
  
      # ### end Alembic commands ###
  