+create unique index concurrently raw_extrinsic_metadata_pkey on raw_extrinsic_metadata(id);
+alter table raw_extrinsic_metadata add primary key using index raw_extrinsic_metadata_pkey;
+
create unique index concurrently raw_extrinsic_metadata_content_authority_date_fetcher on raw_extrinsic_metadata(target, authority_id, discovery_date, fetcher_id);