避免联通实名回调因内部长度限制永久失效

将实名事件身份收敛为受 Outbox 上限约束的稳定摘要，并允许相同 CUCC 回调原子认领失败终态后重试。

Constraint: 运营商回调固定返回成功，公共 Outbox event_id 上限为 64 字符

Rejected: 扩大数据库字段 | 根因是不受控事件 ID，且无法解决旧 failed 回调被吞

Confidence: high

Scope-risk: moderate

Directive: 新增稳定事件 ID 时必须服从持久化长度上限；失败回调恢复必须使用条件更新原子认领

Tested: gofmt；git diff --cached --check

Not-tested: 按用户要求未运行自动化测试、构建或测试环境重放

internal/application/cardobservation/apply.go

@@ -3,6 +3,8 @@ package cardobservation
 
 import (
 	"context"
+	"crypto/sha256"
+	"encoding/hex"
 	"strconv"
 	"time"
 
@@ -98,7 +100,7 @@ func (s *Service) ApplyCardObservation(ctx context.Context, observation domain.R
 			return errors.New(errors.CodeConflict, "卡实名状态已被其他请求更新")
 		}
 		if decision.StatusChanged {
-			eventID := "card-realname:" + strconv.FormatUint(uint64(card.ID), 10) + ":" + observation.Metadata.ObservationID + ":changed"
+			eventID := realnameChangedEventID(card.ID, observation.Metadata.ObservationID)
 			if err := s.eventWriter.AppendRealname(ctx, tx, RealnameChangedEvent{
 				EventID: eventID, CardID: card.ID, BeforeStatus: card.RealNameStatus, AfterStatus: decision.AfterStatus,
 				FirstVerified: decision.FirstVerified, ObservedAt: observation.Metadata.ObservedAt,
@@ -118,3 +120,10 @@ func (s *Service) ApplyCardObservation(ctx context.Context, observation domain.R
 	}
 	return decision, nil
 }
+
+func realnameChangedEventID(cardID uint, observationID string) string {
+	prefix := "card-realname:"
+	digest := sha256.Sum256([]byte(strconv.FormatUint(uint64(cardID), 10) + ":" + observationID + ":changed"))
+	// 使用稳定摘要保留幂等语义，同时严格服从公共 Outbox 的字段长度上限。
+	return prefix + hex.EncodeToString(digest[:])[:constants.OutboxEventIDMaxLength-len(prefix)]
+}

internal/handler/callback/cucc_realname.go

@@ -78,7 +78,7 @@ func (h *CUCCRealnameHandler) process(ctx context.Context, body []byte, contentT
 		return err
 	}
 	if !created {
-		claimed, claimErr := h.claimPending(ctx, log)
+		claimed, claimErr := h.claimRetryable(ctx, log)
 		if claimErr != nil || !claimed {
 			return claimErr
 		}
@@ -129,7 +129,7 @@ func (h *CUCCRealnameHandler) recordConflict(ctx context.Context, body []byte, c
 		return err
 	}
 	if !created {
-		claimed, claimErr := h.claimPending(ctx, log)
+		claimed, claimErr := h.claimRetryable(ctx, log)
 		if claimErr != nil || !claimed {
 			return claimErr
 		}
@@ -137,11 +137,18 @@ func (h *CUCCRealnameHandler) recordConflict(ctx context.Context, body []byte, c
 	return h.complete(ctx, log.IntegrationID, constants.IntegrationResultConflict, false, "同一实名语义对应不同载荷")
 }
 
-func (h *CUCCRealnameHandler) claimPending(ctx context.Context, log *model.IntegrationLog) (bool, error) {
-	if log == nil || log.Result != constants.IntegrationResultPending {
+func (h *CUCCRealnameHandler) claimRetryable(ctx context.Context, log *model.IntegrationLog) (bool, error) {
+	if log == nil {
+		return false, nil
+	}
+	switch log.Result {
+	case constants.IntegrationResultPending:
+		return h.integration.ClaimExpiredInboundPending(ctx, log.IntegrationID, constants.IntegrationInboundProcessingLease)
+	case constants.IntegrationResultFailed:
+		return h.integration.ClaimFailedInbound(ctx, log.IntegrationID)
+	default:
 		return false, nil
 	}
-	return h.integration.ClaimExpiredInboundPending(ctx, log.IntegrationID, constants.IntegrationInboundProcessingLease)
 }
 
 func (h *CUCCRealnameHandler) complete(ctx context.Context, integrationID, result string, changed bool, reason string) error {

internal/infrastructure/integrationlog/repository.go

@@ -256,6 +256,29 @@ func (r *Repository) ClaimExpiredInboundPending(ctx context.Context, integration
 	return result.RowsAffected == 1, nil
 }
 
+// ClaimFailedInbound 原子认领失败的入站回调并恢复为待处理状态。
+func (r *Repository) ClaimFailedInbound(ctx context.Context, integrationID string) (bool, error) {
+	if r == nil || r.db == nil {
+		return false, pkgerrors.New(pkgerrors.CodeInvalidStatus, "Integration Log 数据库未配置")
+	}
+	if strings.TrimSpace(integrationID) == "" {
+		return false, pkgerrors.New(pkgerrors.CodeInvalidParam, "入站 Integration Log 恢复参数无效")
+	}
+	now := r.now().UTC()
+	result := r.db.WithContext(ctx).Model(&model.IntegrationLog{}).
+		Where("integration_id = ? AND direction = ? AND result = ?", integrationID, constants.IntegrationDirectionInbound, constants.IntegrationResultFailed).
+		Updates(map[string]any{
+			"result": constants.IntegrationResultPending, "started_at": now,
+			"attempt": gorm.Expr("attempt + 1"), "updated_at": now,
+			"http_status": nil, "provider_code": nil, "provider_message": nil,
+			"response_summary": nil, "duration_ms": 0, "state_changed": false, "recovery_strategy": nil,
+		})
+	if result.Error != nil {
+		return false, pkgerrors.Wrap(pkgerrors.CodeDatabaseError, result.Error, "认领失败入站 Integration Log 失败")
+	}
+	return result.RowsAffected == 1, nil
+}
+
 func validateAttempt(input Attempt) error {
 	if input.Provider == "" || input.Operation == "" {
 		return pkgerrors.New(pkgerrors.CodeInvalidParam, "Integration Log 提供方和操作不能为空")