The salient part: 'revision_parent Key (parent_id, child_id)=(138484, 140958) already exists.'

× { error: insert into "bookbrainz"."revision_parent" ("child_id", "parent_id") values ($1, $2) - duplicate key value violates unique constraint "revision_parent_pkey"
    at Parser.parseErrorMessage (/home/bookbrainz/bookbrainz-site/node_modules/pg-protocol/dist/parser.js:287:98)
    at Parser.handlePacket (/home/bookbrainz/bookbrainz-site/node_modules/pg-protocol/dist/parser.js:126:29)
    at Parser.parse (/home/bookbrainz/bookbrainz-site/node_modules/pg-protocol/dist/parser.js:39:38)
    at Socket.<anonymous> (/home/bookbrainz/bookbrainz-site/node_modules/pg-protocol/dist/index.js:11:42)
    at Socket.emit (node:events:527:28)
    at addChunk (node:internal/streams/readable:315:12)
    at readableAddChunk (node:internal/streams/readable:289:9)
    at Socket.Readable.push (node:internal/streams/readable:228:10)
    at TCP.onStreamRead (node:internal/stream_base_commons:190:23)
  length: 244,
  severity: 'ERROR',
  code: '23505',
  detail: 'Key (parent_id, child_id)=(138484, 140958) already exists.',
  hint: undefined,
  position: undefined,
  internalPosition: undefined,
  internalQuery: undefined,
  where: undefined,
  schema: 'bookbrainz',
  table: 'revision_parent',
  column: undefined,
  dataType: undefined,
  constraint: 'revision_parent_pkey',
  file: 'nbtinsert.c',
  line: '570',
  routine: '_bt_check_unique' }