title: Sequelize addColumn migration always referring public schema
body: <p>I have an Express application with <strong>Sequelize</strong> as ORM and <strong>PostgreSQL</strong> as database.
  Database is setup in such a manner where every tenants in my application will have different schemas.The migration files which exists in my application contains addColumn/removeColumn migrations.
  But when i am running npx sequelize-cli db:migrate command, i am getting the following error.</p>
  
  <p>ERROR: relation "public.table_name" does not exist</p>
  
  <p>The above error is throwing only for the migration files that contains either addColumn/removeColumn migrations.
  Also  i am nowhere referring to public schema(even deleted the public schema from db).
  Is there a way to run the migrations against a particular schema(say test_schema) in Sequelize without hardcoding the schema name in the migration files? </p>
  
  <p>Update #2</p>
  
  <pre><code>'use strict';
  
  module.exports = {
    up: async(queryInterface, Sequelize) =&gt; {
      try {
        await queryInterface.addColumn('table_name', 'new_field_name', {
          type: Sequelize.INTEGER
        });
        return Promise.resolve();
      } catch (e) {
        return Promise.reject(e);
      }
    },
  
    down: async(queryInterface, Sequelize) =&gt; {
      try {
        await queryInterface.removeColumn('table_name','new_field_name');
        return Promise.resolve();
      } catch (e) {
        return Promise.reject(e);
      }
    }
  };
  </code></pre>
  
  <hr>
  
  <p>Above is the code for addColumn migration .</p>