text: """empty message
  
  Revision ID: 90c05db34e87
  Revises: b0bcd51a05ee
  Create Date: 2019-03-22 00:12:04.865402
  
  """
  from alembic import op
  import sqlalchemy as sa
  
  
  # revision identifiers, used by Alembic.
  revision = '90c05db34e87'
  down_revision = 'b0bcd51a05ee'
  branch_labels = None
  depends_on = None
  
  
  def upgrade():
      # ### commands auto generated by Alembic - please adjust! ###
      op.add_column('post', sa.Column('url', sa.VARCHAR(255), nullable=True))
      # ### end Alembic commands ###
  
  
  def downgrade():
      # ### commands auto generated by Alembic - please adjust! ###
      op.drop_column('post', 'url')
      # ### end Alembic commands ###
  