diff --git a/backend/internal/service/openai_account_runtime_block_fastpath.go b/backend/internal/service/openai_account_runtime_block_fastpath.go
index 7b59c28fd47c..482a7cad880f 100644
--- a/backend/internal/service/openai_account_runtime_block_fastpath.go
+++ b/backend/internal/service/openai_account_runtime_block_fastpath.go
@@ -469,8 +469,94 @@ func (s *OpenAIGatewayService) isOpenAIAccountModelRuntimeBlocked(account *Accou
 	return state.isBlocked(account.ID, openAIAccountModelTransientModel(canonicalModel), time.Now())
 }
 
+func accountPersistedSchedulingCooldownActive(account *Account) bool {
+	if account == nil {
+		return false
+	}
+	now := time.Now()
+	if account.TempUnschedulableUntil != nil && now.Before(*account.TempUnschedulableUntil) {
+		return true
+	}
+	if account.RateLimitResetAt != nil && now.Before(*account.RateLimitResetAt) {
+		return true
+	}
+	if account.OverloadUntil != nil && now.Before(*account.OverloadUntil) {
+		return true
+	}
+	return false
+}
+
+type openAIAccountRuntimeBlockSnapshot struct {
+	until      time.Time
+	generation uint64
+	blocked    bool
+}
+
+func (s *OpenAIGatewayService) peekOpenAIAccountRuntimeBlock(account *Account) openAIAccountRuntimeBlockSnapshot {
+	if s == nil || !isOpenAIAccount(account) {
+		return openAIAccountRuntimeBlockSnapshot{}
+	}
+	mu := s.openAIAccountRuntimeBlockLock(account.ID)
+	mu.Lock()
+	defer mu.Unlock()
+	value, ok := s.openaiAccountRuntimeBlockUntil.Load(account.ID)
+	if !ok {
+		return openAIAccountRuntimeBlockSnapshot{}
+	}
+	until, isTime := value.(time.Time)
+	if !isTime || until.IsZero() || !time.Now().Before(until) {
+		s.openaiAccountRuntimeBlockUntil.Delete(account.ID)
+		s.openaiOAuth429RetryStartedAt.Delete(account.ID)
+		s.openaiAccountRuntimeBlockGeneration.Store(account.ID, s.openaiAccountRuntimeBlockSequence.Add(1))
+		return openAIAccountRuntimeBlockSnapshot{}
+	}
+	generation, _ := s.openaiAccountRuntimeBlockGeneration.Load(account.ID)
+	gen, _ := generation.(uint64)
+	return openAIAccountRuntimeBlockSnapshot{until: until, generation: gen, blocked: true}
+}
+
+// clearOpenAIAccountRuntimeBlockIfUnchanged deletes the in-process account block
+// only when generation and deadline are unchanged. A newer block installed after
+// peek must be kept even if its deadline happens to match.
+func (s *OpenAIGatewayService) clearOpenAIAccountRuntimeBlockIfUnchanged(accountID int64, snapshot openAIAccountRuntimeBlockSnapshot) {
+	if s == nil || accountID <= 0 || !snapshot.blocked {
+		return
+	}
+	mu := s.openAIAccountRuntimeBlockLock(accountID)
+	mu.Lock()
+	defer mu.Unlock()
+	generation, ok := s.openaiAccountRuntimeBlockGeneration.Load(accountID)
+	if !ok || generation != snapshot.generation {
+		return
+	}
+	current, ok := s.openaiAccountRuntimeBlockUntil.Load(accountID)
+	currentUntil, isTime := current.(time.Time)
+	if !ok || !isTime || !currentUntil.Equal(snapshot.until) {
+		return
+	}
+	s.openaiAccountRuntimeBlockUntil.Delete(accountID)
+	s.openaiOAuth429RetryStartedAt.Delete(accountID)
+	s.openaiAccountRuntimeBlockGeneration.Store(accountID, s.openaiAccountRuntimeBlockSequence.Add(1))
+}
+
+// isOpenAIAccountRequestRuntimeBlocked treats persisted cooldown fields on the
+// scheduling Account as source of truth. When TempUnschedulableUntil,
+// RateLimitResetAt, and OverloadUntil are all inactive, a stale local account
+// block is dropped with generation+deadline CAS. Model-scoped transient blocks
+// are left alone. This is fail-open if a DB write failed or the snapshot has
+// not caught up yet: empty cooldown fields drop the local account-level block.
 func (s *OpenAIGatewayService) isOpenAIAccountRequestRuntimeBlocked(account *Account, requestedModel string) bool {
-	return s != nil && (s.isOpenAIAccountRuntimeBlocked(account) || s.isOpenAIAccountModelRuntimeBlocked(account, requestedModel))
+	if s == nil {
+		return false
+	}
+	snapshot := s.peekOpenAIAccountRuntimeBlock(account)
+	if snapshot.blocked {
+		if accountPersistedSchedulingCooldownActive(account) {
+			return true
+		}
+		s.clearOpenAIAccountRuntimeBlockIfUnchanged(account.ID, snapshot)
+	}
+	return s.isOpenAIAccountModelRuntimeBlocked(account, requestedModel)
 }
 
 func (s *OpenAIGatewayService) recordOpenAIOAuth429() {
diff --git a/backend/internal/service/openai_account_runtime_block_fastpath_test.go b/backend/internal/service/openai_account_runtime_block_fastpath_test.go
index 89d8c5b5ec44..7446be26fd20 100644
--- a/backend/internal/service/openai_account_runtime_block_fastpath_test.go
+++ b/backend/internal/service/openai_account_runtime_block_fastpath_test.go
@@ -545,6 +545,45 @@ func TestOpenAIRuntimeBlock_ClearAccountSchedulingBlock(t *testing.T) {
 	require.False(t, svc.isOpenAIAccountRuntimeBlocked(account))
 }
 
+func TestRuntimeBlockHonorsClearedPersistedCooldown(t *testing.T) {
+	svc := &OpenAIGatewayService{}
+	account := &Account{ID: 92, Platform: PlatformGrok, Type: AccountTypeOAuth, Status: StatusActive, Schedulable: true}
+	svc.BlockAccountScheduling(account, time.Now().Add(30*time.Minute), "grok payment required")
+	require.False(t, svc.isOpenAIAccountRequestRuntimeBlocked(account, "grok-3"))
+	require.False(t, svc.isOpenAIAccountRuntimeBlocked(account))
+}
+
+func TestRuntimeBlockConditionalClearSkipsNewerGeneration(t *testing.T) {
+	svc := &OpenAIGatewayService{}
+	account := &Account{ID: 94, Platform: PlatformGrok, Type: AccountTypeOAuth, Status: StatusActive, Schedulable: true}
+	firstUntil := time.Now().Add(10 * time.Minute)
+	svc.BlockAccountScheduling(account, firstUntil, "stale")
+	snapshot := svc.peekOpenAIAccountRuntimeBlock(account)
+	require.True(t, snapshot.blocked)
+	newerUntil := time.Now().Add(30 * time.Minute)
+	svc.BlockAccountScheduling(account, newerUntil, "fresh")
+	svc.clearOpenAIAccountRuntimeBlockIfUnchanged(account.ID, snapshot)
+	require.True(t, svc.isOpenAIAccountRuntimeBlocked(account))
+	require.False(t, svc.isOpenAIAccountRequestRuntimeBlocked(account, "grok-3"))
+	require.False(t, svc.isOpenAIAccountRuntimeBlocked(account))
+}
+
+func TestRuntimeBlockKeepsActivePersistedCooldown(t *testing.T) {
+	svc := &OpenAIGatewayService{}
+	until := time.Now().Add(30 * time.Minute)
+	account := &Account{
+		ID:                     93,
+		Platform:               PlatformGrok,
+		Type:                   AccountTypeOAuth,
+		Status:                 StatusActive,
+		Schedulable:            true,
+		TempUnschedulableUntil: &until,
+	}
+	svc.BlockAccountScheduling(account, until, "grok payment required")
+	require.True(t, svc.isOpenAIAccountRequestRuntimeBlocked(account, "grok-3"))
+	require.True(t, svc.isOpenAIAccountRuntimeBlocked(account))
+}
+
 func TestShouldStopOpenAIOAuth429Failover_AfterBoundedFullWindows(t *testing.T) {
 	svc := &OpenAIGatewayService{}
 	account := &Account{ID: 42, Platform: PlatformOpenAI, Type: AccountTypeOAuth}
diff --git a/backend/internal/service/openai_account_runtime_transient_test.go b/backend/internal/service/openai_account_runtime_transient_test.go
index 4ba1f16a5500..b25794fe77a0 100644
--- a/backend/internal/service/openai_account_runtime_transient_test.go
+++ b/backend/internal/service/openai_account_runtime_transient_test.go
@@ -111,6 +111,8 @@ func TestHandleOpenAITransientError_HardDisableStillBlocksWholeAccount(t *testin
 
 	svc.BlockAccountScheduling(account, time.Now().Add(time.Minute), "upstream_disable")
 
-	require.True(t, svc.isOpenAIAccountRequestRuntimeBlocked(account, "gpt-5.5"))
-	require.True(t, svc.isOpenAIAccountRequestRuntimeBlocked(account, "gpt-5.6-sol"))
+	require.True(t, svc.isOpenAIAccountRuntimeBlocked(account))
+	require.False(t, svc.isOpenAIAccountRequestRuntimeBlocked(account, "gpt-5.5"))
+	require.False(t, svc.isOpenAIAccountRequestRuntimeBlocked(account, "gpt-5.6-sol"))
+	require.False(t, svc.isOpenAIAccountRuntimeBlocked(account))
 }
diff --git a/backend/internal/service/openai_upstream_transport_error.go b/backend/internal/service/openai_upstream_transport_error.go
index ed5c5f9c2330..22a1f6e6a782 100644
--- a/backend/internal/service/openai_upstream_transport_error.go
+++ b/backend/internal/service/openai_upstream_transport_error.go
@@ -163,8 +163,9 @@ func (s *OpenAIGatewayService) tempUnscheduleOpenAITransportError(ctx context.Co
 	until := time.Now().Add(openAITransportErrorTempUnschedDuration)
 	reason := "upstream transport error (proxy/network): " + safeErr
 
-	// Immediate in-memory block (honoured by the scheduler at selection time),
-	// effective even if the DB write below fails or the account cache lags.
+	// Immediate in-memory block so this process skips the account until the
+	// persisted cooldown is visible on the scheduling Account. Selection is
+	// fail-open: empty snapshot/DB cooldown fields drop a stale local block.
 	s.BlockAccountScheduling(account, until, "transport_error")
 
 	if s.accountRepo == nil {