text: """upgrade db by adding mdb_type to table mdb
  
  Revision ID: b6f7320709a8
  Revises: 2666ea9618d7
  Create Date: 2018-06-13 11:38:25.109055
  
  """
  from alembic import op
  import sqlalchemy as sa
  
  
  # revision identifiers, used by Alembic.
  revision = 'b6f7320709a8'
  down_revision = '2666ea9618d7'
  branch_labels = None
  depends_on = None
  
  
  def upgrade():
      # ### commands auto generated by Alembic - please adjust! ###
      op.add_column('mdb', sa.Column('mdb_type', sa.String(length=128), nullable=True))
      # ### end Alembic commands ###
  
  
  def downgrade():
      # ### commands auto generated by Alembic - please adjust! ###
      op.drop_column('mdb', 'mdb_type')
      # ### end Alembic commands ###
  