INSERT INTO "CandidateSkill"
          ("candidateId", "skillId", "seniority")
          VALUES ($1, $2, $3),($4, $5, $6)
          ON CONFLICT ("candidateId", "skillId") DO UPDATE
          SET "seniority"=EXCLUDED."seniority"

Raw query failed. Code:

22021

. Message: `db error: ERROR: invalid byte sequence for encoding “UTF8”: 0x00