I needed to rename columns that were in every table to switch from Rails to Sails.js.

bulk_rename_column.sql

CREATE OR REPLACE FUNCTION bulk_rename_column(old_name text, new_name text) RETURNS SETOF text AS $$
DECLARE
    r RECORD;
BEGIN
    FOR r IN SELECT table_schema, table_name, column_name
      FROM information_schema.columns As c
      WHERE c.table_schema NOT IN('information_schema', 'pg_catalog')
        AND c.column_name = old_name
      ORDER BY c.table_schema, c.table_name, c.column_name
    LOOP
      EXECUTE 'ALTER TABLE ' || quote_ident(r.table_schema) || '.' || quote_ident(r.table_name) || ' RENAME "' || r.column_name || '" TO ' || quote_ident(new_name) || ';';
      RETURN NEXT format('%s.%s %s', r.table_schema, r.table_name, r.column_name);
    END LOOP;
    RETURN;
END;
$$ LANGUAGE plpgsql;

select * from bulk_rename_column('updated_at', 'updatedAt');
select * from bulk_rename_column('created_at', 'createdAt');