diff --git a/docs/ur94-card-state-events-callbacks/功能总结.md b/docs/ur94-card-state-events-callbacks/功能总结.md
index 4e0f422..26555d7 100644
--- a/docs/ur94-card-state-events-callbacks/功能总结.md
+++ b/docs/ur94-card-state-events-callbacks/功能总结.md
@@ -10,7 +10,9 @@
 
 - 合法 ICCID 只按 19/20 位对应列精确查询；不复制旧代码的 20 位截 19 位，不跨列降级，也不任取多匹配卡。
 - 使用 `ICCID + dateChanged` 的安全摘要作为语义幂等键；解析失败使用正文摘要，重复、冲突和中断恢复沿用 Integration Log 租约规则。
+- 内部失败终态收到相同正文重推时，原子恢复为 `pending` 并递增尝试次数；成功等其他终态仍保持幂等跳过。
 - 唯一命中后调用公共 `ApplyCardObservation(verified=true)`，实名事实变化时由公共用例写 Outbox，并尽力提前完成同卡实名观测序列。
+- 卡实名 Outbox 事件 ID 使用受长度上限约束的稳定摘要，避免上游观测 ID 过长导致业务事务回滚。
 - 不调用旧 `inner_callback`、第三方推送、旧平台登录、`ModifyDate` 或 Gateway 二次确认；`dateChanged` 只作为上游变更时间和幂等语义留痕，不直接改写本地业务时间。
 - 无论开关状态、报文结果或内部处理结果，均返回入口时间对应的 HTTP 200 固定 JSON 应答，避免运营商不可控重推。
 
diff --git a/internal/application/cardobservation/apply.go b/internal/application/cardobservation/apply.go
index 45a0ca9..aef7d0f 100644
--- a/internal/application/cardobservation/apply.go
+++ b/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)]
+}
diff --git a/internal/handler/callback/cucc_realname.go b/internal/handler/callback/cucc_realname.go
index 77817de..a3fec31 100644
--- a/internal/handler/callback/cucc_realname.go
+++ b/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 {
diff --git a/internal/infrastructure/integrationlog/repository.go b/internal/infrastructure/integrationlog/repository.go
index c6ee1b1..8ffbdc3 100644
--- a/internal/infrastructure/integrationlog/repository.go
+++ b/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")
diff --git a/pkg/constants/outbox.go b/pkg/constants/outbox.go
index 9ffd9a0..a2559e7 100644
--- a/pkg/constants/outbox.go
+++ b/pkg/constants/outbox.go
@@ -14,6 +14,8 @@ const (
 )
 
 const (
+	// OutboxEventIDMaxLength 是公共 Outbox 稳定事件ID的数据库长度上限。
+	OutboxEventIDMaxLength = 64
 	// OutboxDefaultMaxRetries 是公共 Outbox 默认最大重试次数。
 	OutboxDefaultMaxRetries = 10
 	// OutboxDefaultLeaseDuration 是 Relay 默认租约时长。