text: ------------------------------------------------------
  -- table: oa_distances. indexes
  ------------------------------------------------------
  
  -- index: cuix_oadistances_oalocationtravel
  -- drop index cuix_oadistances_oalocationtravel;
  create unique index cuix_oadistances_oalocationtravel on oa_distances using btree (oa_code, travel_id, location_id);
  alter table oa_distances cluster on cuix_oadistances_oalocationtravel;
  
  -- index: ix_oadistances_oacode
  -- drop index ix_oadistances_oacode;
  create index ix_oadistances_oacode on oa_distances using btree (oa_code);