=== 크래시 흔적 여섯 줄 ===
2026-09-17 05:34:14.944 UTC [1] LOG:  database system is ready to accept connections
2026-09-17 05:35:36.810 UTC [1] LOG:  server process (PID 39) was terminated by signal 9: Killed
2026-09-17 05:35:36.817 UTC [1] LOG:  all server processes terminated; reinitializing
2026-09-17 05:35:36.863 UTC [206] LOG:  database system was not properly shut down; automatic recovery in progress
2026-09-17 05:35:36.865 UTC [206] LOG:  redo starts at 0/1F80A00
2026-09-17 05:35:36.873 UTC [206] LOG:  redo done at 0/21D72B8 system usage: CPU: user: 0.00 s, system: 0.00 s, elapsed: 0.00 s
2026-09-17 05:35:36.909 UTC [207] LOG:  checkpoint complete: wrote 243 buffers (1.5%); 0 WAL file(s) added, 0 removed, 1 recycled; write=0.008 s, sync=0.009 s, total=0.029 s; sync files=26, longest=0.007 s, average=0.001 s; distance=2397 kB, estimate=2397 kB; lsn=0/21D8048, redo lsn=0/21D8048
2026-09-17 05:35:36.912 UTC [1] LOG:  database system is ready to accept connections
=== 관찰 ① 클라이언트 sid 목록 ===
395 /tmp/client-sids.txt
uyMM_LOM5QgdNXZPymOt_d5-
iNI2VuirdOjA-FT7iwt7F21I
01uQ99zaBSaNtNt4v5tT-ned
=== ② 총계 ===
 count 
-------
   392
(1 row)

=== ③ 값만 파일로 ===
392 /tmp/db-sids.txt
=== ④ 정렬해서 왼쪽 전용만 ===
  395 /tmp/a.txt
  392 /tmp/b.txt
  787 total
=== ⑤ 유실 건수 ===
3
=== 유실된 sid (있으면) ===
KvrWnKhKue4DlxozYc63HU4E
S1iYLwU5oASbsePYH2Q1SB_A
cUFSAEsClRh-OS-KvNnaa1Lu