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[v1][P1] HA failover + Lease election 라이브 drill 완료 #248

@KeiaiLab-PHIL

Description

@KeiaiLab-PHIL

목표

Gate G1의 HA election/failover 잔여 live evidence를 닫는다.

작업

  • operator manager 2 replicas 이상 배포
  • failover lease와 manager lease 분리 확인
  • leader pod kill 후 lease holder handoff 확인
  • primary kill/delete 후 standby promotion 확인
  • 새 primary에서 pg_is_in_recovery()=false 확인
  • RTO 측정값을 runbook 또는 release evidence에 기록

완료 기준

  • ha_lease_election live drill PASS
  • split-brain 없음 증거 첨부
  • make lint test validate PASS

참고: docs/ROADMAP.md Gate G1, docs/rfcs/0006-higher-level-database-5r.md

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