text: """empty message
  
  Revision ID: b918ad5e06c9
  Revises: 33807a950b50
  Create Date: 2021-07-20 05:30:52.761419
  
  """
  from alembic import op
  import sqlalchemy as sa
  from sqlalchemy.dialects import mysql
  
  # revision identifiers, used by Alembic.
  revision = 'b918ad5e06c9'
  down_revision = '33807a950b50'
  branch_labels = None
  depends_on = None
  
  
  def upgrade():
      # ### commands auto generated by Alembic - please adjust! ###
      op.drop_index('sys_name', table_name='postboard')
      op.drop_column('postboard', 'sys_name')
      # ### end Alembic commands ###
  
  
  def downgrade():
      # ### commands auto generated by Alembic - please adjust! ###
      op.add_column('postboard', sa.Column('sys_name', mysql.VARCHAR(collation='utf8mb4_bin', length=255), nullable=False))
      op.create_index('sys_name', 'postboard', ['sys_name'], unique=False)
      # ### end Alembic commands ###
  