fix(mcp): уточнить переключение маршрутов и хранение операций

backend/src/modules/mcp/routing-model.ts

@@ -51,36 +51,47 @@ export function rankRoutingCandidates(profile: RouteAiProfile, observations: Rou
 }
 
 export interface PathHealth { id: string; candidateId: string; status: "passed" | "failed" | "unknown"; observedAt: string }
-export interface ControllerState { pendingCandidateId?: string; consecutive?: number; observationKey?: string; lastSwitchAt?: string; switches?: string[]; operationId?: string; pausedReason?: string; failureCount?: number; failureKey?: string; failingCandidateId?: string }
+export interface ControllerState { pendingCandidateId?: string; consecutive?: number; observationKey?: string; lastSwitchAt?: string; switches?: string[]; operationId?: string; pausedReason?: string; failureCount?: number; failureKey?: string; failureObservedAt?: string; failingCandidateId?: string }
+const pathHealthFreshnessSec = 90
 export function decideRoutingSwitch(profile: RouteAiProfile, state: ControllerState, ranking: ReturnType<typeof rankRoutingCandidates>, currentCandidateId: string | null, now = Date.now(), health: PathHealth[] = [], chargedSwitchesPerHour?: number) {
   const next: ControllerState = { ...state, switches: (state.switches ?? []).filter(at => now - Date.parse(at) < 3600000) }
   if (chargedSwitchesPerHour !== undefined && (!Number.isSafeInteger(chargedSwitchesPerHour) || chargedSwitchesPerHour < next.switches!.length || chargedSwitchesPerHour > 4096)) throw Error("Invalid common routing charge count")
   const switchCount = chargedSwitchesPerHour ?? next.switches!.length
   const best = ranking.find(candidate => candidate.eligible), current = ranking.find(candidate => candidate.candidate.id === currentCandidateId)
-  const currentHealth = health.find(value => value.candidateId === currentCandidateId && fresh(value.observedAt, 90, now))
+  const currentHealth = health.find(value => value.candidateId === currentCandidateId && fresh(value.observedAt, pathHealthFreshnessSec, now))
   if (currentHealth?.status === "failed" && currentCandidateId && !state.pausedReason) {
-    if (state.failureKey !== currentHealth.id) {
-      next.failureCount = state.failingCandidateId === currentCandidateId ? (state.failureCount ?? 0) + 1 : 1
-      next.failureKey = currentHealth.id; next.failingCandidateId = currentCandidateId
+    const observed = Date.parse(currentHealth.observedAt), previous = Date.parse(state.failureObservedAt ?? "")
+    const sameCandidate = state.failingCandidateId === currentCandidateId
+    if (state.failureKey === currentHealth.id) {
+      if (!sameCandidate || observed !== previous) return { state: next, switchTo: null, reason: "Ожидание новой проверки отказа" }
+    } else {
+      if (observed <= previous) return { state: next, switchTo: null, reason: "Ожидание новой проверки отказа" }
+      const continues = sameCandidate && fresh(state.failureObservedAt ?? null, pathHealthFreshnessSec, observed)
+      next.failureCount = continues ? (state.failureCount ?? 0) + 1 : 1
+      next.failureKey = currentHealth.id; next.failureObservedAt = currentHealth.observedAt; next.failingCandidateId = currentCandidateId
     }
-    const reserve = ranking.find(value => value.eligible && value.candidate.id !== currentCandidateId && health.some(check => check.candidateId === value.candidate.id && check.status === "passed" && fresh(check.observedAt, 90, now)))
+    const reserve = ranking.find(value => value.eligible && value.candidate.id !== currentCandidateId && health.some(check => check.candidateId === value.candidate.id && check.status === "passed" && fresh(check.observedAt, pathHealthFreshnessSec, now)))
     if ((next.failureCount ?? 0) < 3 || !reserve) return { state: next, switchTo: null, reason: "Failover ожидает три отдельных отказа и подтверждённый резерв" }
     if (switchCount >= profile.maxSwitchesPerHour) return { state: { ...next, pausedReason: "Лимит переключений" }, switchTo: null, reason: "Исчерпан часовой бюджет, включая failover" }
     if (next.lastSwitchAt && now - Date.parse(next.lastSwitchAt) < profile.cooldownSec * 1000) return { state: next, switchTo: null, reason: "Failover ожидает окончания cooldown" }
     return { state: { ...next, failureCount: 0 }, switchTo: reserve.candidate.id, reason: "Failover: три подтверждённых отказа и проверенный резерв" }
   }
-  next.failureCount = 0; next.failureKey = undefined; next.failingCandidateId = undefined
+  next.failureCount = 0; next.failureKey = undefined; next.failureObservedAt = undefined; next.failingCandidateId = undefined
   if (state.pausedReason || !currentCandidateId || !best || best.candidate.id === currentCandidateId) return { state: { ...next, pendingCandidateId: undefined, consecutive: 0 }, switchTo: null, reason: "Нет подтверждённого улучшения или текущего пути" }
   if (!current?.eligible || current.score === null) return { state: next, switchTo: null, reason: "Состояние текущего пути неизвестно; failover требует отдельных подтверждённых проверок отказа" }
   const gain = best.score! - current.score
   if (gain < Math.max(0, profile.switchThreshold - profile.hysteresis)) return { state: { ...next, consecutive: 0, pendingCandidateId: undefined }, switchTo: null, reason: "Сработал гистерезис" }
-  if (gain < profile.switchThreshold && next.pendingCandidateId !== best.candidate.id) return { state: next, switchTo: null, reason: "Порог улучшения не достигнут" }
+  if (gain < profile.switchThreshold) return { state: next, switchTo: null, reason: "Порог улучшения не достигнут" }
   const observationKey = [...best.observationIds, ...current.observationIds].sort().join(":")
+  if (next.pendingCandidateId !== undefined && next.pendingCandidateId !== best.candidate.id) {
+    next.pendingCandidateId = best.candidate.id
+    next.consecutive = 0
+  }
   if (observationKey !== next.observationKey) {
     next.consecutive = next.pendingCandidateId === best.candidate.id ? (next.consecutive ?? 0) + 1 : 1
     next.pendingCandidateId = best.candidate.id; next.observationKey = observationKey
   }
-  if ((next.consecutive ?? 0) < profile.confirmationSamples) return { state: next, switchTo: null, reason: "Ожидание новых измерений" }
+  if (next.pendingCandidateId !== best.candidate.id || (next.consecutive ?? 0) < profile.confirmationSamples) return { state: next, switchTo: null, reason: "Ожидание новых измерений" }
   if (next.lastSwitchAt && now - Date.parse(next.lastSwitchAt) < profile.cooldownSec * 1000) return { state: next, switchTo: null, reason: "Cooldown" }
   if (switchCount >= profile.maxSwitchesPerHour) return { state: { ...next, pausedReason: "Лимит переключений" }, switchTo: null, reason: "Исчерпан часовой бюджет переключений" }
   return { state: next, switchTo: best.candidate.id, reason: "Улучшение подтверждено свежими наблюдениями" }