최신 알림 존재 여부 및 읽기 기능 구현 #388

All 486 tests pass, 1 skipped in 29s

487 tests +2 486 ✔️ +2 29s ⏱️ -1s
156 suites ±0     1 💤 ±0
156 files ±0     0 ❌ ±0

Results for commit 8421e31. ± Comparison against earlier commit 982f08c.