diff --git a/apps/api/internal/httpapi/handlers.go b/apps/api/internal/httpapi/handlers.go
index 03dbae9..4d510f3 100644
--- a/apps/api/internal/httpapi/handlers.go
+++ b/apps/api/internal/httpapi/handlers.go
@@ -931,6 +931,10 @@ func (s *Server) estimatePricing(w http.ResponseWriter, r *http.Request) {
 			writeErrorWithDetails(w, statusFromRunError(err), runErrorMessage(err), runErrorDetails(err), store.ModelCandidateErrorCode(err))
 			return
 		}
+		if code := clients.ErrorCode(err); code == "bad_request" || code == "invalid_parameter" {
+			writeErrorWithDetails(w, http.StatusBadRequest, runErrorMessage(err), runErrorDetails(err), code)
+			return
+		}
 		s.logger.Error("estimate pricing failed", "error", err)
 		writeError(w, http.StatusInternalServerError, "estimate pricing failed")
 		return
diff --git a/apps/api/internal/httpapi/pricing_handlers.go b/apps/api/internal/httpapi/pricing_handlers.go
index a0b8572..bc99e1c 100644
--- a/apps/api/internal/httpapi/pricing_handlers.go
+++ b/apps/api/internal/httpapi/pricing_handlers.go
@@ -165,6 +165,13 @@ func validPricingRuleSetInput(input store.PricingRuleSetInput) bool {
 		default:
 			return false
 		}
+		calculator := strings.TrimSpace(rule.CalculatorType)
+		if calculator == "" {
+			calculator = store.DefaultEffectivePricingCalculator(rule.ResourceType)
+		}
+		if store.ValidateEffectivePricingRuleShape(strings.TrimSpace(rule.ResourceType), store.NormalizeEffectivePricingRuleUnit(rule.ResourceType, rule.Unit), calculator) != nil {
+			return false
+		}
 		effectiveFrom, fromOK := pricingEffectiveTime(rule.EffectiveFrom)
 		effectiveTo, toOK := pricingEffectiveTime(rule.EffectiveTo)
 		if !fromOK || !toOK || (!effectiveFrom.IsZero() && !effectiveTo.IsZero() && !effectiveFrom.Before(effectiveTo)) {
diff --git a/apps/api/internal/runner/execution_lease.go b/apps/api/internal/runner/execution_lease.go
index 58e21de..6fa8aab 100644
--- a/apps/api/internal/runner/execution_lease.go
+++ b/apps/api/internal/runner/execution_lease.go
@@ -2,7 +2,10 @@ package runner
 
 import (
 	"context"
+	"errors"
 	"time"
+
+	"github.com/easyai/easyai-ai-gateway/apps/api/internal/store"
 )
 
 const (
@@ -19,6 +22,9 @@ func (s *Service) renewTaskExecutionLease(ctx context.Context, cancel context.Ca
 			return
 		case <-ticker.C:
 			if err := s.store.RenewTaskExecutionLease(ctx, taskID, executionToken, taskExecutionLeaseTTL); err != nil {
+				if errors.Is(err, store.ErrTaskExecutionFinished) {
+					return
+				}
 				s.logger.Warn("task execution lease lost", "taskID", taskID, "error_category", "task_execution_lease_lost")
 				cancel()
 				return
diff --git a/apps/api/internal/runner/pricing.go b/apps/api/internal/runner/pricing.go
index fb166d5..6366df2 100644
--- a/apps/api/internal/runner/pricing.go
+++ b/apps/api/internal/runner/pricing.go
@@ -38,8 +38,11 @@ func (s *Service) Estimate(ctx context.Context, kind string, model string, body
 	}
 	estimates := make([]candidateEstimate, 0, len(candidates))
 	for _, candidate := range candidates {
-		candidateBody := preprocessRequest(kind, cloneMap(body), candidate)
-		estimate, candidateErr := s.estimateCandidateV2(ctx, user, kind, candidateBody, candidate)
+		preprocessing := s.preprocessRequestWithScripts(ctx, kind, body, candidate)
+		if preprocessing.Err != nil {
+			return EstimateResult{}, parameterPreprocessClientError(preprocessing.Err)
+		}
+		estimate, candidateErr := s.estimateCandidateV2(ctx, user, kind, preprocessing.Body, candidate)
 		if candidateErr != nil {
 			return EstimateResult{}, candidateErr
 		}
diff --git a/apps/api/internal/runner/pricing_v2.go b/apps/api/internal/runner/pricing_v2.go
index 95c42db..53c32db 100644
--- a/apps/api/internal/runner/pricing_v2.go
+++ b/apps/api/internal/runner/pricing_v2.go
@@ -20,9 +20,11 @@ import (
 const (
 	pricingVersionV2 = "effective-pricing-v2"
 	fixedScale       = int64(1_000_000_000)
+	maxFixedAmount   = fixedAmount(math.MaxInt64)
 )
 
 var ErrPricingUnavailable = errors.New("pricing unavailable")
+var errFixedAmountOverflow = errors.New("fixed amount overflow")
 
 type PricingUnavailableError struct {
 	Reason       string
@@ -129,11 +131,11 @@ func fixedAmountFromAny(value any) (fixedAmount, error) {
 	case json.Number:
 		return parseFixedAmount(typed.String())
 	case int:
-		return fixedAmount(int64(typed) * fixedScale), nil
+		return parseFixedAmount(strconv.FormatInt(int64(typed), 10))
 	case int64:
-		return fixedAmount(typed * fixedScale), nil
+		return parseFixedAmount(strconv.FormatInt(typed, 10))
 	case int32:
-		return fixedAmount(int64(typed) * fixedScale), nil
+		return parseFixedAmount(strconv.FormatInt(int64(typed), 10))
 	case float64:
 		if math.IsNaN(typed) || math.IsInf(typed, 0) {
 			return 0, fmt.Errorf("non-finite decimal")
@@ -159,26 +161,37 @@ func (a fixedAmount) String() string {
 func (a fixedAmount) Float64() float64 { return float64(a) / float64(fixedScale) }
 func (a fixedAmount) IsZero() bool     { return a == 0 }
 
-func (a fixedAmount) Add(other fixedAmount) fixedAmount { return a + other }
-
-func (a fixedAmount) MulInt(multiplier int) fixedAmount {
-	return fixedAmount(int64(a) * int64(multiplier))
+func addFixedAmounts(left fixedAmount, right fixedAmount) (fixedAmount, error) {
+	value := new(big.Int).Add(big.NewInt(int64(left)), big.NewInt(int64(right)))
+	return fixedAmountFromBigInt(value)
 }
 
-func (a fixedAmount) Mul(other fixedAmount) fixedAmount {
-	product := new(big.Int).Mul(big.NewInt(int64(a)), big.NewInt(int64(other)))
-	return fixedAmount(roundBigIntRatio(product, big.NewInt(fixedScale)))
+func multiplyFixedAmountByInt(amount fixedAmount, multiplier int) (fixedAmount, error) {
+	value := new(big.Int).Mul(big.NewInt(int64(amount)), big.NewInt(int64(multiplier)))
+	return fixedAmountFromBigInt(value)
 }
 
-func (a fixedAmount) MulRatio(numerator int, denominator int) fixedAmount {
+func multiplyFixedAmounts(left fixedAmount, right fixedAmount) (fixedAmount, error) {
+	product := new(big.Int).Mul(big.NewInt(int64(left)), big.NewInt(int64(right)))
+	return fixedAmountFromBigInt(roundBigIntRatio(product, big.NewInt(fixedScale)))
+}
+
+func multiplyFixedAmountRatio(amount fixedAmount, numerator int, denominator int) (fixedAmount, error) {
 	if denominator == 0 {
-		return 0
+		return 0, fmt.Errorf("division by zero")
 	}
-	product := new(big.Int).Mul(big.NewInt(int64(a)), big.NewInt(int64(numerator)))
-	return fixedAmount(roundBigIntRatio(product, big.NewInt(int64(denominator))))
+	product := new(big.Int).Mul(big.NewInt(int64(amount)), big.NewInt(int64(numerator)))
+	return fixedAmountFromBigInt(roundBigIntRatio(product, big.NewInt(int64(denominator))))
 }
 
-func roundBigIntRatio(numerator *big.Int, denominator *big.Int) int64 {
+func fixedAmountFromBigInt(value *big.Int) (fixedAmount, error) {
+	if value == nil || !value.IsInt64() {
+		return 0, errFixedAmountOverflow
+	}
+	return fixedAmount(value.Int64()), nil
+}
+
+func roundBigIntRatio(numerator *big.Int, denominator *big.Int) *big.Int {
 	negative := numerator.Sign() < 0
 	absolute := new(big.Int).Abs(new(big.Int).Set(numerator))
 	quotient, remainder := new(big.Int), new(big.Int)
@@ -189,7 +202,7 @@ func roundBigIntRatio(numerator *big.Int, denominator *big.Int) int64 {
 	if negative {
 		quotient.Neg(quotient)
 	}
-	return quotient.Int64()
+	return quotient
 }
 
 type resolvedPricing struct {
@@ -248,6 +261,105 @@ func (pricing resolvedPricing) price(resource string, keys ...string) (fixedAmou
 	return 0, false, nil
 }
 
+func (pricing resolvedPricing) weight(resource string, key string, name string) (fixedAmount, error) {
+	if strings.TrimSpace(name) == "" {
+		return fixedAmount(fixedScale), nil
+	}
+	keys := weightKeyAliases(key)
+	names := weightValueAliases(key, name)
+	value, found := pricingWeightValue(pricing.Config, resource, keys, names)
+	if !found {
+		return fixedAmount(fixedScale), nil
+	}
+	weight, err := fixedAmountFromAny(value)
+	if err != nil || weight <= 0 {
+		reason := fmt.Sprintf("invalid %s weight for %s", key, name)
+		if err != nil {
+			reason += ": " + err.Error()
+		}
+		return 0, &PricingUnavailableError{Reason: reason, ResourceType: resource, RuleSetID: pricing.RuleSetID}
+	}
+	return weight, nil
+}
+
+func (pricing resolvedPricing) calculate(resource string, base fixedAmount, integerFactors []int, fixedFactors ...fixedAmount) (fixedAmount, error) {
+	amount := base
+	var err error
+	for _, factor := range integerFactors {
+		amount, err = multiplyFixedAmountByInt(amount, factor)
+		if err != nil {
+			return 0, pricing.calculationError(resource, err)
+		}
+	}
+	for _, factor := range fixedFactors {
+		amount, err = multiplyFixedAmounts(amount, factor)
+		if err != nil {
+			return 0, pricing.calculationError(resource, err)
+		}
+	}
+	return amount, nil
+}
+
+func (pricing resolvedPricing) calculateRatio(resource string, base fixedAmount, numerator int, denominator int, fixedFactors ...fixedAmount) (fixedAmount, error) {
+	amount, err := multiplyFixedAmountRatio(base, numerator, denominator)
+	if err != nil {
+		return 0, pricing.calculationError(resource, err)
+	}
+	return pricing.calculate(resource, amount, nil, fixedFactors...)
+}
+
+func (pricing resolvedPricing) add(resource string, left fixedAmount, right fixedAmount) (fixedAmount, error) {
+	amount, err := addFixedAmounts(left, right)
+	if err != nil {
+		return 0, pricing.calculationError(resource, err)
+	}
+	return amount, nil
+}
+
+func (pricing resolvedPricing) calculationError(resource string, err error) error {
+	return &PricingUnavailableError{Reason: "pricing calculation failed: " + err.Error(), ResourceType: resource, RuleSetID: pricing.RuleSetID}
+}
+
+func pricingWeightValue(config map[string]any, resource string, keys []string, names []string) (any, bool) {
+	if value, ok := pricingWeightValueFromConfig(config, keys, names); ok {
+		return value, true
+	}
+	resourceConfig, _ := config[resource].(map[string]any)
+	if len(resourceConfig) == 0 && resource == "image_edit" {
+		resourceConfig, _ = config["image"].(map[string]any)
+	}
+	return pricingWeightValueFromConfig(resourceConfig, keys, names)
+}
+
+func pricingWeightValueFromConfig(config map[string]any, keys []string, names []string) (any, bool) {
+	if len(config) == 0 {
+		return nil, false
+	}
+	for _, key := range keys {
+		weights, _ := config[key].(map[string]any)
+		for _, name := range names {
+			if value, ok := weights[name]; ok {
+				return value, true
+			}
+		}
+	}
+	dynamic, _ := config["dynamicWeight"].(map[string]any)
+	for _, name := range names {
+		if value, ok := dynamic[name]; ok {
+			return value, true
+		}
+	}
+	for _, key := range keys {
+		weights, _ := dynamic[key].(map[string]any)
+		for _, name := range names {
+			if value, ok := weights[name]; ok {
+				return value, true
+			}
+		}
+	}
+	return nil, false
+}
+
 type candidateEstimate struct {
 	Items    []any
 	Amount   fixedAmount
@@ -474,8 +586,14 @@ func (s *Service) billingsWithResolvedPricingV2(
 		items := make([]any, 0, 3)
 		total := fixedAmount(0)
 		if uncachedInputTokens > 0 || cachedInputTokens == 0 {
-			amount := inputPrice.MulRatio(uncachedInputTokens, 1000).Mul(discount)
-			total = total.Add(amount)
+			amount, calculationErr := pricing.calculateRatio("text_input", inputPrice, uncachedInputTokens, 1000, discount)
+			if calculationErr != nil {
+				return nil, 0, resolvedPricing{}, calculationErr
+			}
+			total, calculationErr = pricing.add("text", total, amount)
+			if calculationErr != nil {
+				return nil, 0, resolvedPricing{}, calculationErr
+			}
 			items = append(items, buildLine("text_input", "1k_tokens", uncachedInputTokens, amount, map[string]any{
 				"inputTokens": inputTokens, "uncachedInputTokens": uncachedInputTokens,
 				"cachedInputTokens": cachedInputTokens, "pricePer1k": inputPrice.Float64(),
@@ -486,8 +604,14 @@ func (s *Service) billingsWithResolvedPricingV2(
 			if priceErr != nil {
 				return nil, 0, resolvedPricing{}, priceErr
 			}
-			amount := cachedPrice.MulRatio(cachedInputTokens, 1000).Mul(discount)
-			total = total.Add(amount)
+			amount, calculationErr := pricing.calculateRatio("text_cached_input", cachedPrice, cachedInputTokens, 1000, discount)
+			if calculationErr != nil {
+				return nil, 0, resolvedPricing{}, calculationErr
+			}
+			total, calculationErr = pricing.add("text", total, amount)
+			if calculationErr != nil {
+				return nil, 0, resolvedPricing{}, calculationErr
+			}
 			items = append(items, buildLine("text_cached_input", "1k_tokens", cachedInputTokens, amount, map[string]any{
 				"inputTokens": inputTokens, "uncachedInputTokens": uncachedInputTokens,
 				"cachedInputTokens": cachedInputTokens, "pricePer1k": cachedPrice.Float64(),
@@ -498,8 +622,14 @@ func (s *Service) billingsWithResolvedPricingV2(
 			if priceErr != nil {
 				return nil, 0, resolvedPricing{}, priceErr
 			}
-			amount := outputPrice.MulRatio(outputTokens, 1000).Mul(discount)
-			total = total.Add(amount)
+			amount, calculationErr := pricing.calculateRatio("text_output", outputPrice, outputTokens, 1000, discount)
+			if calculationErr != nil {
+				return nil, 0, resolvedPricing{}, calculationErr
+			}
+			total, calculationErr = pricing.add("text", total, amount)
+			if calculationErr != nil {
+				return nil, 0, resolvedPricing{}, calculationErr
+			}
 			items = append(items, buildLine("text_output", "1k_tokens", outputTokens, amount, map[string]any{"pricePer1k": outputPrice.Float64()}))
 		}
 		return items, total, pricing, nil
@@ -524,12 +654,26 @@ func (s *Service) billingsWithResolvedPricingV2(
 		if priceErr != nil {
 			return nil, 0, resolvedPricing{}, priceErr
 		}
-		amount := price.MulInt(count).MulInt(durationUnits).
-			Mul(fixedWeight(resourceWeight(pricing.Config, resource, "resolutionWeights", firstNonEmptyString(stringFromMap(body, "resolution"), stringFromMap(body, "size"))))).
-			Mul(fixedWeight(resourceWeight(pricing.Config, resource, "audioWeights", boolWeightKey(audioEnabled)))).
-			Mul(fixedWeight(resourceWeight(pricing.Config, resource, "referenceVideoWeights", boolWeightKey(requestHasReferenceVideo(body))))).
-			Mul(fixedWeight(resourceWeight(pricing.Config, resource, "voiceSpecifiedWeights", boolWeightKey(requestHasVoiceID(body, audioEnabled))))).
-			Mul(discount)
+		resolutionWeight, weightErr := pricing.weight(resource, "resolutionWeights", firstNonEmptyString(stringFromMap(body, "resolution"), stringFromMap(body, "size")))
+		if weightErr != nil {
+			return nil, 0, resolvedPricing{}, weightErr
+		}
+		audioWeight, weightErr := pricing.weight(resource, "audioWeights", boolWeightKey(audioEnabled))
+		if weightErr != nil {
+			return nil, 0, resolvedPricing{}, weightErr
+		}
+		referenceVideoWeight, weightErr := pricing.weight(resource, "referenceVideoWeights", boolWeightKey(requestHasReferenceVideo(body)))
+		if weightErr != nil {
+			return nil, 0, resolvedPricing{}, weightErr
+		}
+		voiceWeight, weightErr := pricing.weight(resource, "voiceSpecifiedWeights", boolWeightKey(requestHasVoiceID(body, audioEnabled)))
+		if weightErr != nil {
+			return nil, 0, resolvedPricing{}, weightErr
+		}
+		amount, calculationErr := pricing.calculate(resource, price, []int{count, durationUnits}, resolutionWeight, audioWeight, referenceVideoWeight, voiceWeight, discount)
+		if calculationErr != nil {
+			return nil, 0, resolvedPricing{}, calculationErr
+		}
 		item := buildLine(resource, unit, count*durationUnits, amount, map[string]any{
 			"count": count, "audio": audioEnabled, "audioSource": audioSource,
 			"durationSeconds": duration, "durationSource": durationSource,
@@ -555,14 +699,32 @@ func (s *Service) billingsWithResolvedPricingV2(
 	if err != nil {
 		return nil, 0, resolvedPricing{}, err
 	}
-	amount := price.MulInt(count)
+	amount, calculationErr := pricing.calculate(resource, price, []int{count})
+	if calculationErr != nil {
+		return nil, 0, resolvedPricing{}, calculationErr
+	}
 	if resource == "image" || resource == "image_edit" {
-		amount = amount.
-			Mul(fixedWeight(resourceWeight(pricing.Config, resource, "qualityWeights", stringFromMap(body, "quality")))).
-			Mul(fixedWeight(resourceWeight(pricing.Config, resource, "sizeWeights", stringFromMap(body, "size")))).
-			Mul(fixedWeight(resourceWeight(pricing.Config, resource, "resolutionWeights", firstNonEmptyString(stringFromMap(body, "resolution"), stringFromMap(body, "size")))))
+		qualityWeight, weightErr := pricing.weight(resource, "qualityWeights", stringFromMap(body, "quality"))
+		if weightErr != nil {
+			return nil, 0, resolvedPricing{}, weightErr
+		}
+		sizeWeight, weightErr := pricing.weight(resource, "sizeWeights", stringFromMap(body, "size"))
+		if weightErr != nil {
+			return nil, 0, resolvedPricing{}, weightErr
+		}
+		resolutionWeight, weightErr := pricing.weight(resource, "resolutionWeights", firstNonEmptyString(stringFromMap(body, "resolution"), stringFromMap(body, "size")))
+		if weightErr != nil {
+			return nil, 0, resolvedPricing{}, weightErr
+		}
+		amount, calculationErr = pricing.calculate(resource, amount, nil, qualityWeight, sizeWeight, resolutionWeight)
+		if calculationErr != nil {
+			return nil, 0, resolvedPricing{}, calculationErr
+		}
+	}
+	amount, calculationErr = pricing.calculate(resource, amount, nil, discount)
+	if calculationErr != nil {
+		return nil, 0, resolvedPricing{}, calculationErr
 	}
-	amount = amount.Mul(discount)
 	return []any{buildLine(resource, unit, count, amount, nil)}, amount, pricing, nil
 }
 
@@ -580,14 +742,6 @@ func (pricing resolvedPricing) requiredTextPrice(resource string, keys ...string
 	return 0, &PricingUnavailableError{Reason: "missing, invalid, or not explicitly free", ResourceType: resource, RuleSetID: pricing.RuleSetID}
 }
 
-func fixedWeight(value float64) fixedAmount {
-	weight, err := fixedAmountFromAny(value)
-	if err != nil || weight <= 0 {
-		return fixedAmount(fixedScale)
-	}
-	return weight
-}
-
 func maximumCandidateEstimate(estimates []candidateEstimate) (candidateEstimate, error) {
 	if len(estimates) == 0 {
 		return candidateEstimate{}, &PricingUnavailableError{Reason: "no candidate has effective pricing"}
diff --git a/apps/api/internal/runner/pricing_v2_test.go b/apps/api/internal/runner/pricing_v2_test.go
index ea16827..dd2acad 100644
--- a/apps/api/internal/runner/pricing_v2_test.go
+++ b/apps/api/internal/runner/pricing_v2_test.go
@@ -1,6 +1,8 @@
 package runner
 
 import (
+	"errors"
+	"math"
 	"testing"
 
 	"github.com/easyai/easyai-ai-gateway/apps/api/internal/store"
@@ -16,11 +18,29 @@ func TestFixedAmountPreservesNineDecimalPlaces(t *testing.T) {
 	}
 
 	price := mustFixedAmount(t, "0.000000001")
-	if got, want := price.MulInt(3).String(), "0.000000003"; got != want {
+	product, err := multiplyFixedAmountByInt(price, 3)
+	if err != nil {
+		t.Fatalf("multiply fixed amount: %v", err)
+	}
+	if got, want := product.String(), "0.000000003"; got != want {
 		t.Fatalf("nano amount multiplication=%q, want %q", got, want)
 	}
 }
 
+func TestFixedAmountOperationsRejectOverflow(t *testing.T) {
+	maximum := fixedAmount(math.MaxInt64)
+	if _, err := multiplyFixedAmountByInt(maximum, 2); !errors.Is(err, errFixedAmountOverflow) {
+		t.Fatalf("multiply overflow error=%v", err)
+	}
+	if _, err := addFixedAmounts(maximum, 1); !errors.Is(err, errFixedAmountOverflow) {
+		t.Fatalf("add overflow error=%v", err)
+	}
+	pricing := resolvedPricing{RuleSetID: "overflow-rule"}
+	if _, err := pricing.calculate("image", maximum, []int{2}); !isPricingUnavailable(err) {
+		t.Fatalf("pricing overflow should be unavailable: %v", err)
+	}
+}
+
 func TestEstimatedOutputTokensUsesAliasesAndCapabilityFallback(t *testing.T) {
 	candidate := store.RuntimeModelCandidate{
 		ModelType: "text_generate",
@@ -97,6 +117,27 @@ func TestPricingAvailabilityRequiresExplicitFree(t *testing.T) {
 	}
 }
 
+func TestPricingWeightsUseFixedPrecisionAndRejectInvalidValues(t *testing.T) {
+	pricing := resolvedPricing{Config: map[string]any{
+		"image": map[string]any{
+			"dynamicWeight": map[string]any{
+				"qualityFactors": map[string]any{"high": "1.123456789", "broken": 0},
+			},
+		},
+	}}
+	weight, err := pricing.weight("image", "qualityWeights", "high")
+	if err != nil || weight.String() != "1.123456789" {
+		t.Fatalf("exact weight=%s err=%v", weight.String(), err)
+	}
+	if _, err := pricing.weight("image", "qualityWeights", "broken"); !isPricingUnavailable(err) {
+		t.Fatalf("invalid configured weight should make pricing unavailable: %v", err)
+	}
+	defaultWeight, err := pricing.weight("image", "qualityWeights", "unconfigured")
+	if err != nil || defaultWeight.String() != "1.000000000" {
+		t.Fatalf("default weight=%s err=%v", defaultWeight.String(), err)
+	}
+}
+
 func mustFixedAmount(t *testing.T, value string) fixedAmount {
 	t.Helper()
 	amount, err := parseFixedAmount(value)
diff --git a/apps/api/internal/runner/queue_worker.go b/apps/api/internal/runner/queue_worker.go
index 17880b8..311821e 100644
--- a/apps/api/internal/runner/queue_worker.go
+++ b/apps/api/internal/runner/queue_worker.go
@@ -49,6 +49,10 @@ func (w *asyncTaskWorker) Work(ctx context.Context, job *river.Job[asyncTaskArgs
 		w.service.logger.Debug("river async task execution lease already held", "taskID", task.ID, "riverJobID", job.ID)
 		return nil
 	}
+	if errors.Is(runErr, store.ErrTaskExecutionManualReview) {
+		w.service.logger.Warn("river async task moved to manual review after ambiguous upstream submission", "taskID", task.ID, "riverJobID", job.ID)
+		return nil
+	}
 	var queuedErr *TaskQueuedError
 	if errors.As(runErr, &queuedErr) {
 		return river.JobSnooze(queuedErr.Delay)
diff --git a/apps/api/internal/runner/service.go b/apps/api/internal/runner/service.go
index 2f2b29f..2f94a38 100644
--- a/apps/api/internal/runner/service.go
+++ b/apps/api/internal/runner/service.go
@@ -302,6 +302,7 @@ func (s *Service) executeWithToken(ctx context.Context, task store.GatewayTask,
 		}
 	}
 	pricingByCandidate := map[string]resolvedPricing{}
+	preprocessingByCandidate := map[string]parameterPreprocessResult{}
 	reservationBillings := []any(nil)
 	reservationPricingSnapshot := map[string]any(nil)
 	if task.RunMode == "production" {
@@ -316,9 +317,17 @@ func (s *Service) executeWithToken(ctx context.Context, task store.GatewayTask,
 		}
 		estimates := make([]candidateEstimate, 0, len(candidates))
 		var pricingErr error
+		var preprocessingErr error
+		var preprocessingCandidate store.RuntimeModelCandidate
 		for _, candidate := range candidates {
-			pricingBody := preprocessRequest(task.Kind, cloneMap(body), candidate)
-			estimate, estimateErr := s.estimateCandidateV2(ctx, user, task.Kind, pricingBody, candidate)
+			preprocessing := s.preprocessRequestWithScripts(ctx, task.Kind, body, candidate)
+			preprocessingByCandidate[pricingCandidateKey(candidate)] = preprocessing
+			if preprocessing.Err != nil {
+				preprocessingErr = parameterPreprocessClientError(preprocessing.Err)
+				preprocessingCandidate = candidate
+				break
+			}
+			estimate, estimateErr := s.estimateCandidateV2(ctx, user, task.Kind, preprocessing.Body, candidate)
 			if estimateErr != nil {
 				pricingErr = estimateErr
 				if billingMode == "enforce" {
@@ -329,8 +338,23 @@ func (s *Service) executeWithToken(ctx context.Context, task store.GatewayTask,
 			estimates = append(estimates, estimate)
 			pricingByCandidate[pricingCandidateKey(candidate)] = estimate.Pricing
 		}
+		if preprocessingErr != nil {
+			preprocessing := preprocessingByCandidate[pricingCandidateKey(preprocessingCandidate)]
+			s.recordFailedAttempt(ctx, failedAttemptRecord{
+				Task: task, Body: preprocessing.Body, Candidate: &preprocessingCandidate,
+				AttemptNo: task.AttemptCount + 1, Code: clients.ErrorCode(preprocessingErr), Cause: preprocessingErr,
+				Simulated: false, Scope: "parameter_preprocessing", Reason: "parameter_preprocessing_failed",
+				ExtraMetrics: []map[string]any{parameterPreprocessingMetrics(preprocessing.Log)}, Preprocessing: &preprocessing.Log,
+				ModelType: preprocessingCandidate.ModelType,
+			})
+			failed, finishErr := s.failTask(ctx, task.ID, task.ExecutionToken, clients.ErrorCode(preprocessingErr), preprocessingErr.Error(), false, preprocessingErr, parameterPreprocessingMetrics(preprocessing.Log))
+			if finishErr != nil {
+				return Result{}, finishErr
+			}
+			return Result{Task: failed, Output: failed.Result}, preprocessingErr
+		}
 		if billingMode == "observe" {
-			legacyItems, legacyAmount := s.maximumLegacyCandidateEstimate(ctx, user, task.Kind, body, candidates)
+			legacyItems, legacyAmount := s.maximumLegacyCandidateEstimate(ctx, user, task.Kind, body, candidates, preprocessingByCandidate)
 			reservationBillings = legacyItems
 			candidateSnapshots := make([]any, 0, len(estimates))
 			for _, estimate := range estimates {
@@ -396,7 +420,10 @@ func (s *Service) executeWithToken(ctx context.Context, task store.GatewayTask,
 		}
 	}()
 	if len(candidates) > 0 {
-		preprocessing := s.preprocessRequestWithScripts(ctx, task.Kind, body, candidates[0])
+		preprocessing, ok := preprocessingByCandidate[pricingCandidateKey(candidates[0])]
+		if !ok {
+			preprocessing = s.preprocessRequestWithScripts(ctx, task.Kind, body, candidates[0])
+		}
 		firstCandidateBody = preprocessing.Body
 		firstPreprocessing = preprocessing.Log
 		normalizedModelType = candidates[0].ModelType
@@ -472,7 +499,10 @@ candidatesLoop:
 		var candidateErr error
 		for clientAttempt := 1; clientAttempt <= clientAttempts; clientAttempt++ {
 			nextAttemptNo := attemptNo + 1
-			preprocessing := s.preprocessRequestWithScripts(ctx, task.Kind, body, candidate)
+			preprocessing, ok := preprocessingByCandidate[pricingCandidateKey(candidate)]
+			if !ok {
+				preprocessing = s.preprocessRequestWithScripts(ctx, task.Kind, body, candidate)
+			}
 			preprocessingLog := preprocessing.Log
 			lastPreprocessing = &preprocessingLog
 			if preprocessing.Err != nil {
@@ -768,11 +798,14 @@ func normalizedBillingEngineMode(value string) string {
 	}
 }
 
-func (s *Service) maximumLegacyCandidateEstimate(ctx context.Context, user *auth.User, kind string, body map[string]any, candidates []store.RuntimeModelCandidate) ([]any, fixedAmount) {
+func (s *Service) maximumLegacyCandidateEstimate(ctx context.Context, user *auth.User, kind string, body map[string]any, candidates []store.RuntimeModelCandidate, preprocessingByCandidate map[string]parameterPreprocessResult) ([]any, fixedAmount) {
 	var maximumItems []any
 	maximumAmount := fixedAmount(0)
 	for index, candidate := range candidates {
 		candidateBody := preprocessRequest(kind, cloneMap(body), candidate)
+		if preprocessing, ok := preprocessingByCandidate[pricingCandidateKey(candidate)]; ok && preprocessing.Err == nil {
+			candidateBody = preprocessing.Body
+		}
 		items := s.estimatedBillings(ctx, user, kind, candidateBody, candidate)
 		amount := billingItemsFixedTotal(items)
 		if index == 0 || amount > maximumAmount {
@@ -792,7 +825,11 @@ func billingItemsFixedTotal(items []any) fixedAmount {
 		}
 		amount, err := fixedAmountFromAny(line["amount"])
 		if err == nil && amount > 0 {
-			total = total.Add(amount)
+			next, addErr := addFixedAmounts(total, amount)
+			if addErr != nil {
+				return maxFixedAmount
+			}
+			total = next
 		}
 	}
 	return total
@@ -925,6 +962,11 @@ func (s *Service) runCandidate(ctx context.Context, task store.GatewayTask, user
 		PreviousResponseTurns:      responseExecution.PreviousTurns,
 	})
 	callFinishedAt := time.Now()
+	if err == nil {
+		if markErr := s.store.SetAttemptUpstreamSubmissionStatus(context.WithoutCancel(ctx), attemptID, "response_received"); markErr != nil {
+			return clients.Response{}, &upstreamSubmissionUnknownError{AttemptID: attemptID, Cause: markErr}
+		}
+	}
 	if response.ResponseStartedAt.IsZero() {
 		response.ResponseStartedAt = callStartedAt
 	}
@@ -939,7 +981,9 @@ func (s *Service) runCandidate(ctx context.Context, task store.GatewayTask, user
 	}
 	if err != nil {
 		if clients.ErrorResponseMetadata(err).StatusCode > 0 {
-			_ = s.store.SetAttemptUpstreamSubmissionStatus(context.WithoutCancel(ctx), attemptID, "response_received")
+			if markErr := s.store.SetAttemptUpstreamSubmissionStatus(context.WithoutCancel(ctx), attemptID, "response_received"); markErr != nil {
+				return clients.Response{}, &upstreamSubmissionUnknownError{AttemptID: attemptID, Cause: markErr}
+			}
 		}
 		retryable := clients.IsRetryable(err)
 		requestID, metrics, responseStartedAt, responseFinishedAt, responseDurationMS := failureMetrics(err, simulated)
diff --git a/apps/api/internal/store/billing_v2_integration_test.go b/apps/api/internal/store/billing_v2_integration_test.go
index e078029..30ed972 100644
--- a/apps/api/internal/store/billing_v2_integration_test.go
+++ b/apps/api/internal/store/billing_v2_integration_test.go
@@ -62,6 +62,149 @@ func TestTaskIdempotencyAndExecutionLease(t *testing.T) {
 	if err != nil || finished.ErrorCode != "new_worker" {
 		t.Fatalf("new worker terminal task=%+v err=%v", finished, err)
 	}
+	if err := db.RenewTaskExecutionLease(ctx, created.Task.ID, secondToken, 5*time.Minute); !errors.Is(err, ErrTaskExecutionFinished) {
+		t.Fatalf("terminal task renewal error=%v", err)
+	}
+}
+
+func TestExpiredExecutionLeaseDoesNotReplayAmbiguousUpstreamSubmission(t *testing.T) {
+	db := billingV2IntegrationStore(t)
+	ctx := context.Background()
+	tenantID, gatewayUserID := seedWalletReservationUser(t, ctx, db)
+	user := &auth.User{ID: "billing-review-" + uuid.NewString(), GatewayUserID: gatewayUserID, GatewayTenantID: tenantID}
+	created, err := db.CreateTask(ctx, CreateTaskInput{
+		Kind: "images.generations", Model: "billing-v2-model", RunMode: "production",
+		Request: map[string]any{"model": "billing-v2-model"},
+	}, user)
+	if err != nil {
+		t.Fatal(err)
+	}
+	t.Cleanup(func() {
+		_, _ = db.pool.Exec(context.Background(), `DELETE FROM gateway_tasks WHERE id=$1::uuid`, created.ID)
+	})
+
+	firstToken := uuid.NewString()
+	if _, err := db.ClaimTaskExecution(ctx, created.ID, firstToken, 5*time.Minute); err != nil {
+		t.Fatal(err)
+	}
+	attemptID, err := db.CreateTaskAttempt(ctx, CreateTaskAttemptInput{
+		TaskID: created.ID, AttemptNo: 1, Status: "running", RequestSnapshot: map[string]any{"model": created.Model},
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if err := db.SetAttemptUpstreamSubmissionStatus(ctx, attemptID, "submitting"); err != nil {
+		t.Fatal(err)
+	}
+	if _, err := db.pool.Exec(ctx, `UPDATE gateway_tasks SET execution_lease_expires_at=now()-interval '1 second' WHERE id=$1::uuid`, created.ID); err != nil {
+		t.Fatal(err)
+	}
+	if _, err := db.ClaimTaskExecution(ctx, created.ID, uuid.NewString(), 5*time.Minute); !errors.Is(err, ErrTaskExecutionManualReview) {
+		t.Fatalf("ambiguous submission takeover error=%v", err)
+	}
+
+	review, err := db.GetTask(ctx, created.ID)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if review.Status != "failed" || review.BillingStatus != "manual_review" || review.ErrorCode != "upstream_submission_unknown" {
+		t.Fatalf("manual review task=%+v", review)
+	}
+	var outboxStatus string
+	var outboxAction string
+	var reviewReason string
+	if err := db.pool.QueryRow(ctx, `
+SELECT status, action, COALESCE(manual_review_reason, '')
+FROM settlement_outbox
+WHERE task_id=$1::uuid AND event_type='task.billing.review'`, created.ID).Scan(&outboxStatus, &outboxAction, &reviewReason); err != nil {
+		t.Fatal(err)
+	}
+	if outboxStatus != "manual_review" || outboxAction != "release" || reviewReason != "upstream_submission_unknown" {
+		t.Fatalf("review outbox status=%s action=%s reason=%s", outboxStatus, outboxAction, reviewReason)
+	}
+}
+
+func TestExpiredExecutionLeaseCanResumeAfterKnownRejectedResponse(t *testing.T) {
+	db := billingV2IntegrationStore(t)
+	ctx := context.Background()
+	_, gatewayUserID := seedWalletReservationUser(t, ctx, db)
+	user := &auth.User{ID: "billing-known-response-" + uuid.NewString(), GatewayUserID: gatewayUserID}
+	created, err := db.CreateTask(ctx, CreateTaskInput{
+		Kind: "images.generations", Model: "billing-v2-model", RunMode: "production",
+		Request: map[string]any{"model": "billing-v2-model"},
+	}, user)
+	if err != nil {
+		t.Fatal(err)
+	}
+	t.Cleanup(func() {
+		_, _ = db.pool.Exec(context.Background(), `DELETE FROM gateway_tasks WHERE id=$1::uuid`, created.ID)
+	})
+
+	if _, err := db.ClaimTaskExecution(ctx, created.ID, uuid.NewString(), 5*time.Minute); err != nil {
+		t.Fatal(err)
+	}
+	attemptID, err := db.CreateTaskAttempt(ctx, CreateTaskAttemptInput{TaskID: created.ID, AttemptNo: 1, Status: "running"})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if err := db.SetAttemptUpstreamSubmissionStatus(ctx, attemptID, "response_received"); err != nil {
+		t.Fatal(err)
+	}
+	if err := db.FinishTaskAttempt(ctx, FinishTaskAttemptInput{AttemptID: attemptID, Status: "failed", ErrorCode: "upstream_rejected"}); err != nil {
+		t.Fatal(err)
+	}
+	if _, err := db.pool.Exec(ctx, `UPDATE gateway_tasks SET execution_lease_expires_at=now()-interval '1 second' WHERE id=$1::uuid`, created.ID); err != nil {
+		t.Fatal(err)
+	}
+	if _, err := db.ClaimTaskExecution(ctx, created.ID, uuid.NewString(), 5*time.Minute); err != nil {
+		t.Fatalf("known rejected response should remain retryable: %v", err)
+	}
+}
+
+func TestFinishTaskManualReviewCreatesVisibleBillingRecord(t *testing.T) {
+	db := billingV2IntegrationStore(t)
+	ctx := context.Background()
+	_, gatewayUserID := seedWalletReservationUser(t, ctx, db)
+	user := &auth.User{ID: "billing-direct-review-" + uuid.NewString(), GatewayUserID: gatewayUserID}
+	created, err := db.CreateTask(ctx, CreateTaskInput{
+		Kind: "images.generations", Model: "billing-v2-model", RunMode: "production",
+		Request: map[string]any{"model": "billing-v2-model"},
+	}, user)
+	if err != nil {
+		t.Fatal(err)
+	}
+	t.Cleanup(func() {
+		_, _ = db.pool.Exec(context.Background(), `DELETE FROM gateway_tasks WHERE id=$1::uuid`, created.ID)
+	})
+	token := uuid.NewString()
+	if _, err := db.ClaimTaskExecution(ctx, created.ID, token, 5*time.Minute); err != nil {
+		t.Fatal(err)
+	}
+	attemptID, err := db.CreateTaskAttempt(ctx, CreateTaskAttemptInput{TaskID: created.ID, AttemptNo: 1, Status: "running"})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if err := db.SetAttemptUpstreamSubmissionStatus(ctx, attemptID, "submitting"); err != nil {
+		t.Fatal(err)
+	}
+	if _, err := db.FinishTaskManualReview(ctx, FinishTaskManualReviewInput{
+		TaskID: created.ID, ExecutionToken: token, AttemptID: attemptID, TaskStatus: "failed",
+		Code: "upstream_submission_unknown", Message: "upstream submission result is unknown",
+	}); err != nil {
+		t.Fatal(err)
+	}
+	var visible bool
+	if err := db.pool.QueryRow(ctx, `
+SELECT EXISTS (
+  SELECT 1 FROM settlement_outbox
+  WHERE task_id=$1::uuid AND status='manual_review'
+    AND action='release' AND manual_review_reason='upstream_submission_unknown'
+)`, created.ID).Scan(&visible); err != nil {
+		t.Fatal(err)
+	}
+	if !visible {
+		t.Fatal("manual review billing record is not visible in settlement outbox")
+	}
 }
 
 func TestBillingSettlementStaleTakeoverDebitsExactlyOnce(t *testing.T) {
diff --git a/apps/api/internal/store/postgres.go b/apps/api/internal/store/postgres.go
index b3d7f93..8de239e 100644
--- a/apps/api/internal/store/postgres.go
+++ b/apps/api/internal/store/postgres.go
@@ -59,6 +59,8 @@ var (
 	ErrIdempotencyKeyReused          = errors.New("idempotency key was reused for a different request")
 	ErrTaskExecutionLeaseUnavailable = errors.New("task execution lease is unavailable")
 	ErrTaskExecutionLeaseLost        = errors.New("task execution lease was lost")
+	ErrTaskExecutionFinished         = errors.New("task execution already finished")
+	ErrTaskExecutionManualReview     = errors.New("task execution requires manual review")
 	ErrProtectedDefault              = errors.New("protected default resource cannot be deleted")
 	ErrUserAlreadyExists             = errors.New("user already exists")
 	ErrWeakPassword                  = errors.New("password must be at least 8 characters")
diff --git a/apps/api/internal/store/pricing_rules.go b/apps/api/internal/store/pricing_rules.go
index a3136cc..bbff1ad 100644
--- a/apps/api/internal/store/pricing_rules.go
+++ b/apps/api/internal/store/pricing_rules.go
@@ -335,6 +335,9 @@ ORDER BY priority ASC, resource_type ASC, rule_key ASC`, id)
 		default:
 			return EffectivePricingConfig{}, fmt.Errorf("pricing rule %s uses unsupported calculator %s", ruleKey, calculatorType)
 		}
+		if err := ValidateEffectivePricingRuleShape(resourceType, unit, calculatorType); err != nil {
+			return EffectivePricingConfig{}, fmt.Errorf("pricing rule %s: %w", ruleKey, err)
+		}
 		if strings.HasPrefix(strings.TrimSpace(basePrice), "-") {
 			return EffectivePricingConfig{}, fmt.Errorf("pricing rule %s has a negative base price", ruleKey)
 		}
@@ -372,6 +375,51 @@ ORDER BY priority ASC, resource_type ASC, rule_key ASC`, id)
 	}, nil
 }
 
+func ValidateEffectivePricingRuleShape(resourceType string, unit string, calculatorType string) error {
+	unit = NormalizeEffectivePricingRuleUnit(resourceType, unit)
+	if strings.TrimSpace(calculatorType) == "" {
+		calculatorType = DefaultEffectivePricingCalculator(resourceType)
+	}
+	allowed := false
+	switch resourceType {
+	case "text_input", "text_cached_input", "text_output", "text_total":
+		allowed = unit == "1k_tokens" && calculatorType == "token_usage"
+	case "image", "image_edit":
+		allowed = unit == "image" && calculatorType == "unit_weight"
+	case "video":
+		allowed = unit == "5s" && calculatorType == "duration_weight"
+	case "music":
+		allowed = (unit == "song" || unit == "item") && calculatorType == "unit_weight"
+	case "audio":
+		allowed = unit == "character" && calculatorType == "unit_weight"
+	default:
+		return nil
+	}
+	if !allowed {
+		return fmt.Errorf("unit %q and calculator %q do not match resource %q", unit, calculatorType, resourceType)
+	}
+	return nil
+}
+
+func NormalizeEffectivePricingRuleUnit(resourceType string, unit string) string {
+	unit = strings.TrimSpace(unit)
+	if resourceType == "video" && unit == "video" {
+		return "5s"
+	}
+	return unit
+}
+
+func DefaultEffectivePricingCalculator(resourceType string) string {
+	switch strings.TrimSpace(resourceType) {
+	case "text_input", "text_cached_input", "text_output", "text_total":
+		return "token_usage"
+	case "video":
+		return "duration_weight"
+	default:
+		return "unit_weight"
+	}
+}
+
 func addPricingRuleToConfig(config map[string]any, resourceType string, basePrice string, dynamicWeight map[string]any, formulaConfig map[string]any) {
 	resourceConfig := map[string]any{"basePrice": basePrice}
 	if len(dynamicWeight) > 0 {
@@ -591,7 +639,7 @@ func normalizePricingRule(input PricingRuleInput, index int, defaultCurrency str
 	input.RuleKey = strings.TrimSpace(input.RuleKey)
 	input.DisplayName = strings.TrimSpace(input.DisplayName)
 	input.ResourceType = strings.TrimSpace(input.ResourceType)
-	input.Unit = strings.TrimSpace(input.Unit)
+	input.Unit = NormalizeEffectivePricingRuleUnit(input.ResourceType, input.Unit)
 	input.Currency = strings.TrimSpace(input.Currency)
 	input.CalculatorType = strings.TrimSpace(input.CalculatorType)
 	input.Status = strings.TrimSpace(input.Status)
@@ -608,7 +656,7 @@ func normalizePricingRule(input PricingRuleInput, index int, defaultCurrency str
 		input.Currency = defaultCurrency
 	}
 	if input.CalculatorType == "" {
-		input.CalculatorType = "unit_weight"
+		input.CalculatorType = DefaultEffectivePricingCalculator(input.ResourceType)
 	}
 	if input.Priority == 0 {
 		input.Priority = (index + 1) * 10
diff --git a/apps/api/internal/store/pricing_rules_test.go b/apps/api/internal/store/pricing_rules_test.go
new file mode 100644
index 0000000..4c538cd
--- /dev/null
+++ b/apps/api/internal/store/pricing_rules_test.go
@@ -0,0 +1,27 @@
+package store
+
+import "testing"
+
+func TestValidateEffectivePricingRuleShape(t *testing.T) {
+	tests := []struct {
+		name       string
+		resource   string
+		unit       string
+		calculator string
+		valid      bool
+	}{
+		{name: "text", resource: "text_input", unit: "1k_tokens", calculator: "token_usage", valid: true},
+		{name: "image", resource: "image", unit: "image", calculator: "unit_weight", valid: true},
+		{name: "video", resource: "video", unit: "5s", calculator: "duration_weight", valid: true},
+		{name: "wrong video unit", resource: "video", unit: "second", calculator: "duration_weight"},
+		{name: "wrong image calculator", resource: "image", unit: "image", calculator: "token_usage"},
+	}
+	for _, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
+			err := ValidateEffectivePricingRuleShape(test.resource, test.unit, test.calculator)
+			if (err == nil) != test.valid {
+				t.Fatalf("valid=%v err=%v", test.valid, err)
+			}
+		})
+	}
+}
diff --git a/apps/api/internal/store/tasks_runtime.go b/apps/api/internal/store/tasks_runtime.go
index 0b55e76..fff569a 100644
--- a/apps/api/internal/store/tasks_runtime.go
+++ b/apps/api/internal/store/tasks_runtime.go
@@ -157,7 +157,83 @@ func (s *Store) ClaimTaskExecution(ctx context.Context, taskID string, execution
 	if leaseTTL <= 0 {
 		leaseTTL = 5 * time.Minute
 	}
-	task, err := scanGatewayTask(s.pool.QueryRow(ctx, `
+	var task GatewayTask
+	manualReview := false
+	err := pgx.BeginFunc(ctx, s.pool, func(tx pgx.Tx) error {
+		var queuedReady bool
+		var runningExpired bool
+		var production bool
+		var hasGatewayUser bool
+		if err := tx.QueryRow(ctx, `
+SELECT status = 'queued' AND next_run_at <= now(),
+       status = 'running' AND (execution_lease_expires_at IS NULL OR execution_lease_expires_at <= now()),
+       run_mode = 'production',
+       gateway_user_id IS NOT NULL
+FROM gateway_tasks
+WHERE id = $1::uuid
+FOR UPDATE`, taskID).Scan(&queuedReady, &runningExpired, &production, &hasGatewayUser); err != nil {
+			return err
+		}
+		if !queuedReady && !runningExpired {
+			return ErrTaskExecutionLeaseUnavailable
+		}
+		if runningExpired && production {
+			var submissionAmbiguous bool
+			if err := tx.QueryRow(ctx, `
+SELECT COALESCE((
+  SELECT (
+    (status = 'running' AND upstream_submission_status IN ('submitting', 'response_received'))
+    OR (status = 'failed' AND upstream_submission_status = 'submitting')
+  )
+  FROM gateway_task_attempts
+  WHERE task_id = $1::uuid
+  ORDER BY attempt_no DESC, started_at DESC
+  LIMIT 1
+), false)`, taskID).Scan(&submissionAmbiguous); err != nil {
+				return err
+			}
+			if submissionAmbiguous {
+				if _, err := tx.Exec(ctx, `
+UPDATE gateway_tasks
+SET status = 'failed',
+    billing_status = CASE WHEN $2 THEN 'manual_review' ELSE 'not_required' END,
+    billing_updated_at = now(),
+    error = 'upstream submission result is unknown',
+    error_code = 'upstream_submission_unknown',
+    error_message = 'upstream submission result is unknown',
+    locked_by = NULL,
+    locked_at = NULL,
+    heartbeat_at = NULL,
+    execution_token = NULL,
+    execution_lease_expires_at = NULL,
+    finished_at = now(),
+    updated_at = now()
+WHERE id = $1::uuid`, taskID, hasGatewayUser); err != nil {
+					return err
+				}
+				if hasGatewayUser {
+					payloadJSON, _ := json.Marshal(map[string]any{
+						"taskId": taskID, "classification": "upstream_submission_unknown",
+					})
+					if _, err := tx.Exec(ctx, `
+INSERT INTO settlement_outbox (
+  task_id, event_type, action, amount, currency, pricing_snapshot, payload,
+  status, next_attempt_at, manual_review_reason
+)
+SELECT id, 'task.billing.review', 'release', reservation_amount, billing_currency,
+       pricing_snapshot, $2::jsonb, 'manual_review', now(), 'upstream_submission_unknown'
+FROM gateway_tasks
+WHERE id = $1::uuid
+ON CONFLICT (task_id, event_type) DO NOTHING`, taskID, string(payloadJSON)); err != nil {
+						return err
+					}
+				}
+				manualReview = true
+				return nil
+			}
+		}
+		var err error
+		task, err = scanGatewayTask(tx.QueryRow(ctx, `
 UPDATE gateway_tasks
 SET status = 'running',
     execution_token = $2::uuid,
@@ -171,10 +247,18 @@ WHERE id = $1::uuid
     OR (status = 'running' AND (execution_lease_expires_at IS NULL OR execution_lease_expires_at <= now()))
   )
 RETURNING `+gatewayTaskColumns, taskID, executionToken, int(leaseTTL/time.Second)))
-	if errors.Is(err, pgx.ErrNoRows) {
-		return GatewayTask{}, ErrTaskExecutionLeaseUnavailable
+		return err
+	})
+	if err != nil {
+		if errors.Is(err, pgx.ErrNoRows) {
+			return GatewayTask{}, ErrTaskExecutionLeaseUnavailable
+		}
+		return GatewayTask{}, err
 	}
-	return task, err
+	if manualReview {
+		return GatewayTask{}, ErrTaskExecutionManualReview
+	}
+	return task, nil
 }
 
 func (s *Store) RenewTaskExecutionLease(ctx context.Context, taskID string, executionToken string, leaseTTL time.Duration) error {
@@ -193,6 +277,14 @@ WHERE id = $1::uuid
 		return err
 	}
 	if tag.RowsAffected() != 1 {
+		var stillRunning bool
+		if err := s.pool.QueryRow(ctx, `
+SELECT COALESCE((SELECT status = 'running' FROM gateway_tasks WHERE id = $1::uuid), false)`, taskID).Scan(&stillRunning); err != nil {
+			return err
+		}
+		if !stillRunning {
+			return ErrTaskExecutionFinished
+		}
 		return ErrTaskExecutionLeaseLost
 	}
 	return nil
@@ -902,8 +994,7 @@ SET status = $2,
     response_started_at = $6::timestamptz,
     response_finished_at = $7::timestamptz,
     response_duration_ms = $8,
-    finished_at = now(),
-    updated_at = now()
+    finished_at = now()
 WHERE id = $1::uuid`, input.AttemptID, attemptStatus, input.RequestID, input.Code, input.Message,
 				nullableTime(input.ResponseStartedAt), nullableTime(input.ResponseFinishedAt), input.ResponseDurationMS); err != nil {
 				return err
@@ -942,7 +1033,22 @@ WHERE id = $1::uuid
 		if tag.RowsAffected() != 1 {
 			return ErrTaskExecutionLeaseLost
 		}
-		return nil
+		payloadJSON, _ := json.Marshal(map[string]any{
+			"taskId": input.TaskID, "classification": input.Code,
+		})
+		_, err = tx.Exec(ctx, `
+INSERT INTO settlement_outbox (
+  task_id, event_type, action, amount, currency, pricing_snapshot, payload,
+  status, next_attempt_at, manual_review_reason
+)
+SELECT id, 'task.billing.review', 'release', reservation_amount, billing_currency,
+       pricing_snapshot, $2::jsonb, 'manual_review', now(), $3
+FROM gateway_tasks
+WHERE id = $1::uuid
+  AND run_mode = 'production'
+  AND gateway_user_id IS NOT NULL
+ON CONFLICT (task_id, event_type) DO NOTHING`, input.TaskID, string(payloadJSON), input.Code)
+		return err
 	})
 	if err != nil {
 		return GatewayTask{}, err
diff --git a/apps/api/migrations/0069_billing_correctness_v2.sql b/apps/api/migrations/0069_billing_correctness_v2.sql
index 3ababdb..659651a 100644
--- a/apps/api/migrations/0069_billing_correctness_v2.sql
+++ b/apps/api/migrations/0069_billing_correctness_v2.sql
@@ -95,6 +95,20 @@ ALTER TABLE model_pricing_rules
 
 UPDATE model_pricing_rules SET is_free = false WHERE is_free IS NULL;
 
+UPDATE model_pricing_rules
+SET calculator_type = CASE
+      WHEN resource_type IN ('text_input', 'text_cached_input', 'text_output', 'text_total') THEN 'token_usage'
+      WHEN resource_type = 'video' THEN 'duration_weight'
+      ELSE calculator_type
+    END,
+    unit = CASE
+      WHEN resource_type = 'video' AND unit = 'video' THEN '5s'
+      ELSE unit
+    END,
+    updated_at = now()
+WHERE (resource_type IN ('text_input', 'text_cached_input', 'text_output', 'text_total') AND calculator_type = 'unit_weight')
+   OR (resource_type = 'video' AND (calculator_type = 'unit_weight' OR unit = 'video'));
+
 ALTER TABLE model_pricing_rules
   ADD CONSTRAINT model_pricing_rules_explicit_free_v2_check CHECK (
     base_price > 0 OR (base_price = 0 AND is_free)
@@ -152,6 +166,30 @@ WHERE task.status = 'succeeded'
       AND transaction.transaction_type = 'task_billing'
   );
 
+INSERT INTO settlement_outbox (
+  task_id, event_type, action, amount, currency, pricing_snapshot, payload,
+  status, next_attempt_at, manual_review_reason
+)
+SELECT task.id,
+       'task.billing.review',
+       'settle',
+       COALESCE(task.final_charge_amount, 0),
+       COALESCE(NULLIF(task.billing_summary->>'currency', ''), 'resource'),
+       COALESCE(task.pricing_snapshot, '{}'::jsonb),
+       jsonb_build_object(
+         'taskId', task.id,
+         'classification', 'historical_success_without_charge'
+       ),
+       'manual_review',
+       now(),
+       'historical_success_without_charge'
+FROM gateway_tasks task
+WHERE task.billing_status = 'manual_review'
+  AND task.status = 'succeeded'
+  AND task.run_mode = 'production'
+  AND task.gateway_user_id IS NOT NULL
+ON CONFLICT (task_id, event_type) DO NOTHING;
+
 INSERT INTO settlement_outbox (
   task_id, event_type, action, amount, currency, payload, status, next_attempt_at
 )
diff --git a/apps/web/src/pages/PlaygroundPage.pricing.test.ts b/apps/web/src/pages/PlaygroundPage.pricing.test.ts
index abacfb2..b7ff559 100644
--- a/apps/web/src/pages/PlaygroundPage.pricing.test.ts
+++ b/apps/web/src/pages/PlaygroundPage.pricing.test.ts
@@ -3,6 +3,7 @@ import type { GatewayPricingEstimate } from '@easyai-ai-gateway/contracts';
 import {
   MEDIA_ESTIMATE_DEBOUNCE_MS,
   billingEstimateSignature,
+  mediaEstimateAllowsProduction,
   mediaEstimateFromResponse,
 } from './PlaygroundPage';
 
@@ -46,4 +47,11 @@ describe('playground pricing estimate', () => {
       status: 'free',
     });
   });
+
+  it('only allows production submission for the current pricing signature', () => {
+    expect(mediaEstimateAllowsProduction({ status: 'ready', signature: 'current' }, 'current')).toBe(true);
+    expect(mediaEstimateAllowsProduction({ status: 'free', signature: 'current' }, 'current')).toBe(true);
+    expect(mediaEstimateAllowsProduction({ status: 'ready', signature: 'stale' }, 'current')).toBe(false);
+    expect(mediaEstimateAllowsProduction({ status: 'loading', signature: 'current' }, 'current')).toBe(false);
+  });
 });
diff --git a/apps/web/src/pages/PlaygroundPage.tsx b/apps/web/src/pages/PlaygroundPage.tsx
index 048bc6c..38daa15 100644
--- a/apps/web/src/pages/PlaygroundPage.tsx
+++ b/apps/web/src/pages/PlaygroundPage.tsx
@@ -66,6 +66,7 @@ type MediaEstimateState = {
   error?: string;
   pricingVersion?: string;
   resolver?: string;
+  signature?: string;
   status: 'idle' | 'loading' | 'ready' | 'free' | 'unavailable' | 'error';
 };
 
@@ -192,18 +193,19 @@ export function PlaygroundPage(props: {
     const sequence = mediaEstimateSequenceRef.current + 1;
     mediaEstimateSequenceRef.current = sequence;
     const controller = new AbortController();
-    setMediaEstimate((current) => ({ ...current, error: '', status: 'loading' }));
+    setMediaEstimate((current) => ({ ...current, error: '', signature: mediaEstimateSignature, status: 'loading' }));
     const timer = window.setTimeout(() => {
       estimatePricing(credential, mediaEstimatePayload, controller.signal)
         .then((estimate) => {
           if (controller.signal.aborted || sequence !== mediaEstimateSequenceRef.current) return;
-          setMediaEstimate(mediaEstimateFromResponse(estimate));
+          setMediaEstimate({ ...mediaEstimateFromResponse(estimate), signature: mediaEstimateSignature });
         })
         .catch((err) => {
           if (controller.signal.aborted || sequence !== mediaEstimateSequenceRef.current) return;
           const unavailable = err instanceof GatewayApiError && err.details.code === 'pricing_unavailable';
           setMediaEstimate({
             error: err instanceof Error ? err.message : unavailable ? '价格不可用' : '预计扣费计算失败',
+            signature: mediaEstimateSignature,
             status: unavailable ? 'unavailable' : 'error',
           });
         });
@@ -326,17 +328,34 @@ export function PlaygroundPage(props: {
       setMediaMessage(runMode === 'video' ? '请输入视频提示词。' : '请输入图片提示词。');
       return;
     }
-    if (!overrides && !mediaEstimateAllowsProduction(mediaEstimate)) {
+    const runUploads = sanitizeMediaRunUploads(overrides?.uploads ?? mediaUploads);
+    const runVideoMode = overrides?.videoMode ?? videoMode;
+    const runModelOption = modelOptions.find((item) => item.value === runModel);
+    const runEstimatePayload = buildMediaEstimatePayload(runMode, runModel, trimmedPrompt, runSettings, runUploads, runVideoMode, {
+      supportsQualityControl: runModelOption
+        ? deriveMediaModelCapabilities(runModelOption.models, runMode, runVideoMode, runSettings.resolution).supportsQualityControl
+        : mediaCapabilities?.supportsQualityControl,
+    });
+    const runEstimateSignature = billingEstimateSignature(runEstimatePayload);
+    if (!overrides && !mediaEstimateAllowsProduction(mediaEstimate, runEstimateSignature)) {
       setMediaMessage(mediaEstimate.status === 'unavailable'
         ? '当前参数没有可用价格，已阻止生产生成。'
         : '请等待当前参数的预计费用计算完成后再生成。');
       return;
     }
+    if (overrides) {
+      try {
+        await estimatePricing(credential, runEstimatePayload);
+      } catch (error) {
+        const unavailable = error instanceof GatewayApiError && error.details.code === 'pricing_unavailable';
+        setMediaMessage(unavailable
+          ? '当前参数没有可用价格，已阻止生产生成。'
+          : `预计扣费计算失败，未提交生产任务：${error instanceof Error ? error.message : '未知错误'}`);
+        return;
+      }
+    }
 
     const localId = newLocalId();
-    const runUploads = sanitizeMediaRunUploads(overrides?.uploads ?? mediaUploads);
-    const runVideoMode = overrides?.videoMode ?? videoMode;
-    const runModelOption = modelOptions.find((item) => item.value === runModel);
     const modelLabel = runModelOption?.label ?? runModel;
     const run: MediaGenerationRun = {
       createdAt: new Date().toISOString(),
@@ -475,7 +494,7 @@ export function PlaygroundPage(props: {
       imageHasReference={effectiveImageHasReference}
       mediaSettings={mediaSettings}
       mediaEstimate={mediaEstimate}
-      submitDisabled={!mediaEstimateAllowsProduction(mediaEstimate)}
+      submitDisabled={!mediaEstimateAllowsProduction(mediaEstimate, mediaEstimateSignature)}
       mediaCapabilities={mediaCapabilities}
       uploadAccept={mediaUploadAcceptValue}
       uploadMessage={mediaUploadMessage}
@@ -901,8 +920,8 @@ function mediaEstimateAriaLabel(estimate: MediaEstimateState) {
   return `预计扣费 ${formatEstimateAmount(estimate.amount)} ${estimate.currency || 'resource'}`;
 }
 
-function mediaEstimateAllowsProduction(estimate: MediaEstimateState) {
-  return estimate.status === 'ready' || estimate.status === 'free';
+export function mediaEstimateAllowsProduction(estimate: MediaEstimateState, signature: string) {
+  return estimate.signature === signature && (estimate.status === 'ready' || estimate.status === 'free');
 }
 
 export function billingEstimateSignature(payload: Record<string, unknown> | null) {
diff --git a/apps/web/src/pages/admin/BillingSettlementsPanel.tsx b/apps/web/src/pages/admin/BillingSettlementsPanel.tsx
index 00cac21..17f5829 100644
--- a/apps/web/src/pages/admin/BillingSettlementsPanel.tsx
+++ b/apps/web/src/pages/admin/BillingSettlementsPanel.tsx
@@ -2,13 +2,14 @@ import { useCallback, useEffect, useState } from 'react';
 import { AlertTriangle, ReceiptText, RefreshCw, RotateCcw } from 'lucide-react';
 import type { BillingSettlement } from '@easyai-ai-gateway/contracts';
 import { listBillingSettlements, retryBillingSettlement } from '../../api';
-import { Badge, Button, Card, CardContent, CardHeader, CardTitle, Select, Table, TableCell, TableHead, TableRow } from '../../components/ui';
+import { Badge, Button, Card, CardContent, CardHeader, CardTitle, ConfirmDialog, Select, Table, TableCell, TableHead, TableRow } from '../../components/ui';
 
 export function BillingSettlementsPanel(props: { token: string }) {
   const [items, setItems] = useState<BillingSettlement[]>([]);
   const [status, setStatus] = useState('');
   const [loading, setLoading] = useState(false);
   const [retrying, setRetrying] = useState('');
+  const [confirming, setConfirming] = useState<BillingSettlement | null>(null);
   const [message, setMessage] = useState('');
 
   const load = useCallback(async (signal?: AbortSignal) => {
@@ -95,8 +96,8 @@ export function BillingSettlementsPanel(props: { token: string }) {
               <TableCell>{item.lastErrorCode || item.manualReviewReason || '-'}</TableCell>
               <TableCell>
                 {(item.status === 'retryable_failed' || item.status === 'manual_review') ? (
-                  <Button type="button" size="xs" variant="outline" disabled={retrying === item.id} onClick={() => void retry(item)}>
-                    <RotateCcw size={13} />{retrying === item.id ? '提交中' : '重试'}
+                  <Button type="button" size="xs" variant="outline" disabled={retrying === item.id} onClick={() => setConfirming(item)}>
+                    <RotateCcw size={13} />{retrying === item.id ? '提交中' : retryActionLabel(item)}
                   </Button>
                 ) : '-'}
               </TableCell>
@@ -106,6 +107,19 @@ export function BillingSettlementsPanel(props: { token: string }) {
       ) : (
         <Card><CardContent className="emptyState"><AlertTriangle size={18} /><strong>{loading ? '正在加载结算队列' : '暂无结算记录'}</strong><span>可切换状态筛选，查看待处理与人工复核记录。</span></CardContent></Card>
       )}
+      <ConfirmDialog
+        open={Boolean(confirming)}
+        loading={Boolean(confirming && retrying === confirming.id)}
+        title={confirming ? `${retryActionLabel(confirming)}这条计费记录？` : '处理计费记录？'}
+        description={confirming ? retryActionDescription(confirming) : ''}
+        confirmLabel={confirming ? retryActionLabel(confirming) : '确认'}
+        onCancel={() => setConfirming(null)}
+        onConfirm={() => {
+          if (!confirming) return;
+          const item = confirming;
+          void retry(item).finally(() => setConfirming(null));
+        }}
+      />
     </div>
   );
 }
@@ -126,6 +140,23 @@ function formatAmount(value: number) {
   return new Intl.NumberFormat('zh-CN', { minimumFractionDigits: 0, maximumFractionDigits: 9 }).format(value);
 }
 
+function retryActionLabel(item: BillingSettlement) {
+  if (item.status !== 'manual_review') return '重试';
+  if (item.manualReviewReason === 'upstream_submission_unknown' && item.action === 'release') return '确认释放';
+  if (item.manualReviewReason === 'historical_success_without_charge' && item.action === 'settle') return '确认结算';
+  return '重新入队';
+}
+
+function retryActionDescription(item: BillingSettlement) {
+  if (item.manualReviewReason === 'upstream_submission_unknown' && item.action === 'release') {
+    return '上游提交结果不明。确认后只会释放当前冻结，不会再次调用上游；请先完成外部核查。';
+  }
+  if (item.manualReviewReason === 'historical_success_without_charge' && item.action === 'settle') {
+    return `确认后将按历史快照结算 ${formatAmount(item.amount)} ${item.currency}，不会重新调用上游。`;
+  }
+  return '确认后会将该记录重新放入结算队列，不会重新调用上游。';
+}
+
 function shortId(value: string) {
   return value.length > 12 ? `${value.slice(0, 8)}…${value.slice(-4)}` : value;
 }
diff --git a/docs/billing-flow-v2.md b/docs/billing-flow-v2.md
index 4944897..e122344 100644
--- a/docs/billing-flow-v2.md
+++ b/docs/billing-flow-v2.md
@@ -26,7 +26,9 @@ sequenceDiagram
 
 ## 失败与取消
 
-上游提交前失败、上游明确失败和用户取消均在任务终态事务内写入 `release` Outbox。Worker 使用冻结流水的幂等键释放资金。若上游请求已经进入 `submitting` 但没有可靠响应，系统不得再次提交；任务转人工复核并保留冻结。
+上游提交前失败、上游明确失败和用户取消均在任务终态事务内写入 `release` Outbox。Worker 使用冻结流水的幂等键释放资金。若上游请求已经进入 `submitting`，或成功响应已返回但任务终态尚未提交，租约接管必须停止自动执行；任务和对应 Outbox 转人工复核并保留冻结。
+
+人工复核记录在管理端明确显示后续动作。上游结果不明的记录只能由 Manager 在完成外部核查后确认释放；历史成功未扣费且金额快照可用的记录可由 Manager 明确确认结算。两类操作均要求确认、`Idempotency-Key` 和审计记录，且不会再次调用上游。
 
 ## 即时估价