-- Promote the de-facto unique constraint on transcription_block_mentioned_persons to a named PK.
-- uq_tbmp_block_person (added in V57) is backed by a B-tree index identical to a PK;
-- this rename makes the naming convention explicit (pk_* vs uq_*).
ALTER TABLE transcription_block_mentioned_persons
    DROP CONSTRAINT uq_tbmp_block_person;

ALTER TABLE transcription_block_mentioned_persons
    ADD CONSTRAINT pk_tbmp PRIMARY KEY (block_id, person_id);
