[IDLE-587] 채팅 메시지에 Sequence 추가 #179
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1. 🔥 변경된 내용
2. 💡 알게된 부분
서버에서는 isRead와 같은 FullScan Column을 지울 수 있으므로, 서버딴에서 join이 하나 사라지는 것이라 쿼리 성능이 상승할 수 있음