感谢报告 @James_Wong 
我重新设计了点赞和表情反应的计数与同步方式，现在采用批量处理。虽然实际操作中会稍微慢一点，但绝不会阻塞任何主要数据表。
FIX: Recalculate like counters with one shared rule by ZogStriP · Pull Request #44647 · discourse/discourse · GitHub
FIX: Stop the reactions like sync from re-trashing likes every hour by ZogStriP · Pull Request #44648 · discourse/discourse · GitHub