Duplicate sequences created #44
Description
Duplicate sequences are created e.g. classifiertype_classifiertypepk_seq and classifiertype_classifiertypepk_seq1.
This is because there is SQL to explicitly (CREATE SEQUENCE ..) and implicitly (colname SERIAL) create the sequences in https://github.com/ONSdigital/rm-survey-service/blob/master/db-migrations/1_create_schema.up.sql