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Each tenant monitor owns its own IncidentStore, but incident and incident-event IDs came from package-level int64 counters bumped with ++ under nothing but the calling store's mutex. Two tenants recording alerts at once raced on them: go test -race failed TestLeavingMockModeClearsEveryRunningTenantMonitor on PR 2698 at incidents.go:1753. The remediation record counter had the same shape, and remediation logs are created per org. All six internal/ai/memory ID generators now mint through one atomic helper. The numeric suffix also stops wrapping at 1000: even with atomic counters, one generator minting more than a thousand IDs in a wall-clock second repeated an ID, and incident notes find their incident by ID. The prefix and timestamp layout is unchanged, and intToString lost its last callers. ids_test.go mints 2,400 IDs from every generator on 16 goroutines and records alerts into two tenant stores concurrently. Against the old files it reports DATA RACE at incidents.go:1753/1760 and remediation.go:355, and every generator mints duplicate or wrapped IDs.