MODSOURMAN-632 Create a script to delete duplicate mapping rules for each record type

Script to delete duplicated mapping rules by record type:

Delete duplicated mapping rules

DELETE FROM
diku_mod_source_record_manager.mapping_rules a
USING diku_mod_source_record_manager.mapping_rules b
WHERE a.id < b.id AND a.record_type = b.record_type
RETURNING a.id, a.record_type;