text: -- +goose NO TRANSACTION
  -- +goose Up
  -- +goose StatementBegin
  CREATE UNIQUE INDEX CONCURRENTLY users_email_key ON users(email);
  -- +goose StatementEnd
  
  -- +goose Down
  -- +goose StatementBegin
  DROP INDEX CONCURRENTLY users_email_key;
  -- +goose StatementEnd
  