실험: 2025-12-earned-impression-api-call-experiment (user)

디스코드 데이터 마이닝 실험 삭제됨: 2025-12-earned-impression-api-call-experiment. 처리군: Variant 0, Variant 1, Variant 2, Variant 3, Variant 4, Variant 5, Variant 6.