new_contents: """
  
  Revision ID: 0161_email_branding
  Revises: 0160_another_letter_org
  Create Date: 2018-01-30 15:35:12.016574
  
  """
  from alembic import op
  import sqlalchemy as sa
  from sqlalchemy.dialects import postgresql
  
  revision = '0161_email_branding'
  down_revision = '0160_another_letter_org'
  
  
  def upgrade():
      op.create_table('email_branding',
          sa.Column('id', postgresql.UUID(as_uuid=True), nullable=False),
          sa.Column('colour', sa.String(length=7), nullable=True),
          sa.Column('logo', sa.String(length=255), nullable=True),
          sa.Column('name', sa.String(length=255), nullable=True),
          sa.PrimaryKeyConstraint('id')
      )
      op.create_table('service_email_branding',
          sa.Column('service_id', postgresql.UUID(as_uuid=True), nullable=True),
          sa.Column('email_branding_id', postgresql.UUID(as_uuid=True), nullable=True),
          sa.ForeignKeyConstraint(['email_branding_id'], ['email_branding.id'], ),
          sa.ForeignKeyConstraint(['service_id'], ['services.id'], ),
          sa.UniqueConstraint('service_id', name='uix_service_email_branding_one_per_service'),
          sa.PrimaryKeyConstraint('service_id')
      )
      op.execute("""
          INSERT INTO email_branding (id, colour, logo, name)
          SELECT id, colour, logo, name
          FROM organisation
      """)
      op.execute("""
          INSERT INTO service_email_branding (service_id, email_branding_id)
          SELECT id, organisation_id
          FROM services where organisation_id is not null
      """)
  
  
  def downgrade():
      op.drop_table('service_email_branding')
      op.drop_table('email_branding')
  
subject: add email branding mapping table