text: """empty message
  
  Revision ID: f2953f105ea4
  Revises: 7ade0ed3634b
  Create Date: 2020-08-25 16:59:02.112353
  
  """
  from alembic import op
  import sqlalchemy as sa
  
  
  # revision identifiers, used by Alembic.
  revision = 'f2953f105ea4'
  down_revision = '7ade0ed3634b'
  branch_labels = None
  depends_on = None
  
  
  def upgrade():
      # ### commands auto generated by Alembic - please adjust! ###
      op.create_unique_constraint(None, 'user', ['username'])
      # ### end Alembic commands ###
  
  
  def downgrade():
      # ### commands auto generated by Alembic - please adjust! ###
      op.drop_constraint(None, 'user', type_='unique')
      # ### end Alembic commands ###
  