content: """add last_user_activity [3dcc5d20e82f].
  
  Revision ID: 3dcc5d20e82f
  Revises: 909550c7c4da
  Create Date: 2024-08-07 14:49:07.623500
  
  """
  
  import sqlalchemy as sa
  import sqlmodel
  from alembic import op
  
  from zenml.utils.time_utils import utc_now
  
  # revision identifiers, used by Alembic.
  revision = "3dcc5d20e82f"
  down_revision = "026d4577b6a0"
  branch_labels = None
  depends_on = None
  
  
  def upgrade() -> None:
      """Upgrade database schema and/or data, creating a new revision."""
      bind = op.get_bind()
      session = sqlmodel.Session(bind=bind)
  
      with op.batch_alter_table("server_settings", schema=None) as batch_op:
          batch_op.add_column(
              sa.Column("last_user_activity", sa.DateTime(), nullable=True)
          )
  
      session.execute(
          sa.text(
              """
              UPDATE server_settings
              SET last_user_activity = :last_user_activity
              """
          ),
          params=(dict(last_user_activity=utc_now())),
      )
  
      with op.batch_alter_table("server_settings", schema=None) as batch_op:
          batch_op.alter_column(
              "last_user_activity", existing_type=sa.DateTime(), nullable=False
          )
  
  
  def downgrade() -> None:
      """Downgrade database schema and/or data back to the previous revision."""
      with op.batch_alter_table("server_settings", schema=None) as batch_op:
          batch_op.drop_column("last_user_activity")
  