code: def upgrade():
      
      op.create_table(
          'oaiserver_set',
          sa.Column('created', sa.DateTime(), nullable=False),
          sa.Column('updated', sa.DateTime(), nullable=False),
          sa.Column('id', sa.Integer(), nullable=False),
          sa.Column('spec', sa.String(length=255), nullable=False),
          sa.Column('name', sa.String(length=255), nullable=True),
          sa.Column('description', sa.Text(), nullable=True),
          sa.Column('search_pattern', sa.Text(), nullable=True),
          sa.PrimaryKeyConstraint('id'),
          sa.UniqueConstraint('spec')
      )
      op.create_index(
          op.f('ix_oaiserver_set_name'),
          'oaiserver_set',
          ['name'],
          unique=False
      )
docs: Upgrade database.