text: """empty message
  
  Revision ID: 0019 add articles
  Revises: 0018 add duration and venue_id
  Create Date: 2018-11-24 14:54:09.364415
  
  """
  
  # revision identifiers, used by Alembic.
  revision = '0019 add articles'
  down_revision = '0018 add duration and venue_id'
  
  from alembic import op
  import sqlalchemy as sa
  from sqlalchemy.dialects import postgresql
  
  def upgrade():
      # ### commands auto generated by Alembic - please adjust! ###
      op.create_table('articles',
      sa.Column('id', postgresql.UUID(as_uuid=True), nullable=False),
      sa.Column('old_id', sa.Integer(), nullable=True),
      sa.Column('title', sa.String(length=255), nullable=True),
      sa.Column('author', sa.String(length=255), nullable=True),
      sa.Column('content', sa.Text(), nullable=True),
      sa.Column('created_at', sa.DateTime(), nullable=True),
      sa.PrimaryKeyConstraint('id')
      )
      op.alter_column(u'event_dates', 'venue_id',
                 existing_type=postgresql.UUID(),
                 nullable=True)
      # ### end Alembic commands ###
  
  
  def downgrade():
      # ### commands auto generated by Alembic - please adjust! ###
      op.alter_column(u'event_dates', 'venue_id',
                 existing_type=postgresql.UUID(),
                 nullable=False)
      op.drop_table('articles')
      # ### end Alembic commands ###
  