diff --git a/README.md b/README.md
index d3ac1ff..ee48de3 100644
--- a/README.md
+++ b/README.md
@@ -113,6 +113,12 @@ curl http://localhost:8080/api/store/list
    ```
    脚本把历史门店开通状态标为不可推断的 `unknown`，建立只保存 token SHA-256 的一次性员工邀请和不可变低敏审计表。末尾六项状态/回执一致性验证必须全部为 0；不得恢复 legacy 永久邀请码注册。
 
+10. **StoreCustomer 合并别名与事实时间线连续性**：门店开通迁移验证完成后执行：
+   ```bash
+   mysql -h <host> -u <user> -p petstore < db/migrations/20260802_create_store_customer_timeline.sql
+   ```
+   脚本为被合并的软删除客户投影增加同店 canonical 指针。既有 `BusinessEvent` 保持不可变，时间线通过主档与别名共同读取历史事实。末尾两项别名状态/目标验证必须全部为 0。
+
 ### production profile
 
 ```bash
@@ -128,14 +134,14 @@ production profile 下：
 
 ### 生产只读预检
 
-完成备份和六个迁移后，以最终生产环境变量运行：
+完成备份和七个迁移后，以最终生产环境变量运行：
 
 ```bash
 chmod +x deploy/release-preflight.sh deploy/production-smoke.sh
 BUILD_FIRST=1 deploy/release-preflight.sh
 ```
 
-脚本先校验生产配置、上传目录、Java 与 FFmpeg，再启动无 Web 的 `production` profile，执行 JPA schema `validate` 和 24 项只读数据不变量检查，通过后退出。它不会执行迁移，也不会修复数据。
+脚本先校验生产配置、上传目录、Java 与 FFmpeg，再启动无 Web 的 `production` profile，执行 JPA schema `validate` 和 26 项只读数据不变量检查，通过后退出。它不会执行迁移，也不会修复数据。
 
 ## 测试
 
diff --git a/db/migrations/20260802_create_store_customer_timeline.sql b/db/migrations/20260802_create_store_customer_timeline.sql
new file mode 100644
index 0000000..314382f
--- /dev/null
+++ b/db/migrations/20260802_create_store_customer_timeline.sql
@@ -0,0 +1,26 @@
+-- Petstore Phase 0：StoreCustomer 合并别名与事实时间线连续性
+-- 前置：20260802_create_store_onboarding.sql 已执行。
+-- 语义：BusinessEvent 不改写；被合并的软删除主档通过同店 canonical 指针保留历史事实归属。
+
+ALTER TABLE t_store_customer
+    ADD COLUMN merged_into_store_customer_id BIGINT NULL
+        COMMENT '软删除客户投影并入的同店 canonical StoreCustomer ID';
+
+CREATE INDEX idx_store_customer_merge
+    ON t_store_customer (store_id, merged_into_store_customer_id);
+
+-- 验证：以下两项必须全部为 0。
+SELECT COUNT(*) AS invalid_store_customer_alias_state_count
+FROM t_store_customer sc
+WHERE (sc.deleted = 0 AND sc.merged_into_store_customer_id IS NOT NULL)
+   OR sc.id = sc.merged_into_store_customer_id;
+
+SELECT COUNT(*) AS invalid_store_customer_alias_target_count
+FROM t_store_customer sc_alias
+LEFT JOIN t_store_customer canonical
+  ON canonical.id = sc_alias.merged_into_store_customer_id
+ AND canonical.store_id = sc_alias.store_id
+ AND canonical.deleted = 0
+ AND canonical.merged_into_store_customer_id IS NULL
+WHERE sc_alias.merged_into_store_customer_id IS NOT NULL
+  AND canonical.id IS NULL;
diff --git a/db/migrations/README.md b/db/migrations/README.md
index 69b03a6..4c374d7 100644
--- a/db/migrations/README.md
+++ b/db/migrations/README.md
@@ -20,4 +20,6 @@
 
 `20260802_create_store_onboarding.sql` 必须在报告发送状态迁移之后执行：为历史门店写入不可推断的 `unknown` 开通状态，建立只存 token 摘要的限时员工邀请与低敏不可变操作审计。脚本末尾六个验证计数必须为 0；不得用 legacy `invite_code` 恢复公开员工注册。
 
+`20260802_create_store_customer_timeline.sql` 必须在门店开通迁移之后执行：为被合并的软删除 StoreCustomer 投影增加同店 canonical 指针。既有 BusinessEvent 不改写，事实时间线同时读取 canonical 与别名的历史事件；脚本末尾两个验证计数必须为 0。
+
 正式迁移框架仍属于 Phase 0 后续任务；接入前不得把本目录误当成自动执行目录。
diff --git a/src/main/java/com/petstore/config/ProductionDatabasePreflightRunner.java b/src/main/java/com/petstore/config/ProductionDatabasePreflightRunner.java
index fcaf3ee..b908385 100644
--- a/src/main/java/com/petstore/config/ProductionDatabasePreflightRunner.java
+++ b/src/main/java/com/petstore/config/ProductionDatabasePreflightRunner.java
@@ -61,6 +61,21 @@ public class ProductionDatabasePreflightRunner implements ApplicationRunner {
                     JOIN t_user u ON u.id = sc.customer_user_id
                     WHERE sc.deleted = 0 AND (u.deleted <> 0 OR u.role <> 'customer')
                     """),
+            new Invariant("invalid_store_customer_alias_state", """
+                    SELECT COUNT(*) FROM t_store_customer sc
+                    WHERE (sc.deleted = 0 AND sc.merged_into_store_customer_id IS NOT NULL)
+                       OR sc.id = sc.merged_into_store_customer_id
+                    """),
+            new Invariant("invalid_store_customer_alias_target", """
+                    SELECT COUNT(*) FROM t_store_customer sc_alias
+                    LEFT JOIN t_store_customer canonical
+                      ON canonical.id = sc_alias.merged_into_store_customer_id
+                     AND canonical.store_id = sc_alias.store_id
+                     AND canonical.deleted = 0
+                     AND canonical.merged_into_store_customer_id IS NULL
+                    WHERE sc_alias.merged_into_store_customer_id IS NOT NULL
+                      AND canonical.id IS NULL
+                    """),
             new Invariant("appointments_without_created_event", """
                     SELECT COUNT(*) FROM t_appointment a
                     LEFT JOIN t_business_event e
diff --git a/src/main/java/com/petstore/controller/AdminServiceCustomerController.java b/src/main/java/com/petstore/controller/AdminServiceCustomerController.java
index 91e3cd3..9e8beb1 100644
--- a/src/main/java/com/petstore/controller/AdminServiceCustomerController.java
+++ b/src/main/java/com/petstore/controller/AdminServiceCustomerController.java
@@ -3,6 +3,8 @@ package com.petstore.controller;
 import com.petstore.auth.CurrentUser;
 import com.petstore.auth.CurrentUserContext;
 import com.petstore.service.AdminServiceCustomerService;
+import com.petstore.service.FlowException;
+import com.petstore.service.StoreCustomerTimelineService;
 import lombok.RequiredArgsConstructor;
 import org.springframework.format.annotation.DateTimeFormat;
 import org.springframework.web.bind.annotation.CrossOrigin;
@@ -25,6 +27,7 @@ import java.util.Map;
 public class AdminServiceCustomerController {
 
     private final AdminServiceCustomerService adminServiceCustomerService;
+    private final StoreCustomerTimelineService storeCustomerTimelineService;
 
     @GetMapping("/service-customers")
     public Map<String, Object> listServiceCustomers(
@@ -52,4 +55,27 @@ public class AdminServiceCustomerController {
         );
         return Map.of("code", 200, "data", data);
     }
+
+    /** 本店客户的低敏业务事实时间线；storeId 始终从会话派生。 */
+    @GetMapping("/service-customers/timeline")
+    public Map<String, Object> timeline(
+            @RequestParam Long storeCustomerId,
+            @RequestParam(required = false, defaultValue = "1") int page,
+            @RequestParam(required = false, defaultValue = "20") int pageSize
+    ) {
+        CurrentUser u = CurrentUserContext.require();
+        if (!u.isStoreUser() || u.storeId() == null) {
+            return Map.of("code", 403, "message", "仅门店员工可查看客户时间线", "bizCode", "FORBIDDEN");
+        }
+        try {
+            return Map.of(
+                    "code", 200,
+                    "data", storeCustomerTimelineService.timeline(
+                            u.storeId(), storeCustomerId, page, pageSize
+                    )
+            );
+        } catch (FlowException e) {
+            return Map.of("code", e.code(), "message", e.getMessage(), "bizCode", e.bizCode());
+        }
+    }
 }
diff --git a/src/main/java/com/petstore/entity/StoreCustomer.java b/src/main/java/com/petstore/entity/StoreCustomer.java
index dfccc03..2aee8cb 100644
--- a/src/main/java/com/petstore/entity/StoreCustomer.java
+++ b/src/main/java/com/petstore/entity/StoreCustomer.java
@@ -34,7 +34,8 @@ import java.time.LocalDateTime;
         },
         indexes = {
                 @Index(name = "idx_store_customer_active_update", columnList = "store_id,deleted,update_time"),
-                @Index(name = "idx_store_customer_last_contact", columnList = "store_id,last_contact_at")
+                @Index(name = "idx_store_customer_last_contact", columnList = "store_id,last_contact_at"),
+                @Index(name = "idx_store_customer_merge", columnList = "store_id,merged_into_store_customer_id")
         }
 )
 public class StoreCustomer {
@@ -67,6 +68,14 @@ public class StoreCustomer {
     @Column(name = "last_contact_at")
     private LocalDateTime lastContactAt;
 
+    /**
+     * 软删除投影并入的同店 canonical StoreCustomer。
+     *
+     * <p>BusinessEvent 保持不可变并继续引用旧投影；读取客户时间线时通过此指针合并历史事实。
+     */
+    @Column(name = "merged_into_store_customer_id")
+    private Long mergedIntoStoreCustomerId;
+
     @Column(name = "create_time", nullable = false)
     private LocalDateTime createTime;
 
diff --git a/src/main/java/com/petstore/mapper/BusinessEventMapper.java b/src/main/java/com/petstore/mapper/BusinessEventMapper.java
index 8662b3b..030f993 100644
--- a/src/main/java/com/petstore/mapper/BusinessEventMapper.java
+++ b/src/main/java/com/petstore/mapper/BusinessEventMapper.java
@@ -2,6 +2,8 @@ package com.petstore.mapper;
 
 import com.petstore.entity.BusinessEvent;
 import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.data.domain.Page;
+import org.springframework.data.domain.Pageable;
 import org.springframework.data.jpa.repository.Query;
 import org.springframework.data.repository.query.Param;
 
@@ -16,6 +18,12 @@ public interface BusinessEventMapper extends JpaRepository<BusinessEvent, Long>
 
     List<BusinessEvent> findByStoreCustomerIdOrderByOccurredAtDesc(Long storeCustomerId);
 
+    Page<BusinessEvent> findByStoreIdAndStoreCustomerIdIn(
+            Long storeId,
+            Collection<Long> storeCustomerIds,
+            Pageable pageable
+    );
+
     @Query("""
             select count(distinct e.aggregateId)
             from BusinessEvent e
diff --git a/src/main/java/com/petstore/mapper/StoreCustomerMapper.java b/src/main/java/com/petstore/mapper/StoreCustomerMapper.java
index 79e3b1b..1811e48 100644
--- a/src/main/java/com/petstore/mapper/StoreCustomerMapper.java
+++ b/src/main/java/com/petstore/mapper/StoreCustomerMapper.java
@@ -13,4 +13,10 @@ public interface StoreCustomerMapper extends JpaRepository<StoreCustomer, Long>
     Optional<StoreCustomer> findFirstByStoreIdAndCustomerUserId(Long storeId, Long customerUserId);
 
     Optional<StoreCustomer> findFirstByStoreIdAndPhone(Long storeId, String phone);
+
+    Optional<StoreCustomer> findFirstByIdAndStoreIdAndDeletedFalse(Long id, Long storeId);
+
+    Optional<StoreCustomer> findFirstByIdAndStoreId(Long id, Long storeId);
+
+    List<StoreCustomer> findByStoreIdAndMergedIntoStoreCustomerId(Long storeId, Long mergedIntoStoreCustomerId);
 }
diff --git a/src/main/java/com/petstore/service/StoreCustomerService.java b/src/main/java/com/petstore/service/StoreCustomerService.java
index 3375622..19ecb52 100644
--- a/src/main/java/com/petstore/service/StoreCustomerService.java
+++ b/src/main/java/com/petstore/service/StoreCustomerService.java
@@ -109,6 +109,7 @@ public class StoreCustomerService {
             }
             mergeContactWindow(byUser, byPhone);
             byPhone.setPhone(null);
+            byPhone.setMergedIntoStoreCustomerId(byUser.getId());
             byPhone.setDeleted(true);
             byPhone.setUpdateTime(LocalDateTime.now());
             storeCustomerMapper.saveAndFlush(byPhone);
@@ -126,6 +127,7 @@ public class StoreCustomerService {
             target.setCreateTime(LocalDateTime.now());
         }
         target.setDeleted(false);
+        target.setMergedIntoStoreCustomerId(null);
         if (customerUserId != null) {
             target.setCustomerUserId(customerUserId);
         }
diff --git a/src/main/java/com/petstore/service/StoreCustomerTimelineService.java b/src/main/java/com/petstore/service/StoreCustomerTimelineService.java
new file mode 100644
index 0000000..5eba529
--- /dev/null
+++ b/src/main/java/com/petstore/service/StoreCustomerTimelineService.java
@@ -0,0 +1,357 @@
+package com.petstore.service;
+
+import com.fasterxml.jackson.core.type.TypeReference;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.petstore.entity.Appointment;
+import com.petstore.entity.BusinessEvent;
+import com.petstore.entity.Report;
+import com.petstore.entity.ReportLead;
+import com.petstore.entity.StoreCustomer;
+import com.petstore.entity.User;
+import com.petstore.mapper.AppointmentMapper;
+import com.petstore.mapper.BusinessEventMapper;
+import com.petstore.mapper.ReportLeadMapper;
+import com.petstore.mapper.ReportMapper;
+import com.petstore.mapper.StoreCustomerMapper;
+import com.petstore.mapper.UserMapper;
+import lombok.RequiredArgsConstructor;
+import org.springframework.data.domain.Page;
+import org.springframework.data.domain.PageRequest;
+import org.springframework.data.domain.Sort;
+import org.springframework.stereotype.Service;
+
+import java.time.LocalDateTime;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.LinkedHashMap;
+import java.util.LinkedHashSet;
+import java.util.List;
+import java.util.Locale;
+import java.util.Map;
+import java.util.Objects;
+import java.util.Set;
+import java.util.function.Function;
+import java.util.stream.Collectors;
+
+/** StoreCustomer 稳定主档下的低敏、只读业务事实时间线。 */
+@Service
+@RequiredArgsConstructor
+public class StoreCustomerTimelineService {
+
+    private static final TypeReference<Map<String, Object>> METADATA_TYPE = new TypeReference<>() {};
+
+    private final StoreCustomerMapper storeCustomerMapper;
+    private final BusinessEventMapper businessEventMapper;
+    private final AppointmentMapper appointmentMapper;
+    private final ReportMapper reportMapper;
+    private final ReportLeadMapper reportLeadMapper;
+    private final UserMapper userMapper;
+    private final ObjectMapper objectMapper;
+
+    public Map<String, Object> timeline(Long storeId, Long storeCustomerId, int page, int pageSize) {
+        if (storeId == null || storeCustomerId == null) {
+            throw new FlowException(400, "INVALID_CUSTOMER_TIMELINE", "缺少门店客户参数");
+        }
+        StoreCustomer requestedCustomer = storeCustomerMapper
+                .findFirstByIdAndStoreId(storeCustomerId, storeId)
+                .orElseThrow(() -> new FlowException(404, "STORE_CUSTOMER_NOT_FOUND", "客户不存在"));
+        StoreCustomer customer = resolveCanonicalCustomer(storeId, requestedCustomer);
+        Set<Long> timelineCustomerIds = new LinkedHashSet<>();
+        timelineCustomerIds.add(customer.getId());
+        storeCustomerMapper.findByStoreIdAndMergedIntoStoreCustomerId(storeId, customer.getId()).stream()
+                .map(StoreCustomer::getId)
+                .filter(Objects::nonNull)
+                .forEach(timelineCustomerIds::add);
+
+        int safePage = Math.max(page, 1);
+        int safeSize = Math.min(Math.max(pageSize, 1), 100);
+        PageRequest pageable = PageRequest.of(
+                safePage - 1,
+                safeSize,
+                Sort.by(Sort.Order.desc("occurredAt"), Sort.Order.desc("id"))
+        );
+        Page<BusinessEvent> eventPage = businessEventMapper
+                .findByStoreIdAndStoreCustomerIdIn(storeId, timelineCustomerIds, pageable);
+        List<BusinessEvent> events = eventPage.getContent();
+
+        Map<Long, Appointment> appointments = loadAppointments(storeId, events);
+        Map<Long, Report> reports = loadReports(storeId, events);
+        Map<Long, ReportLead> leads = loadLeads(storeId, events);
+        Map<Long, User> actors = loadActors(events);
+        User customerUser = customer.getCustomerUserId() == null ? null
+                : userMapper.findByIdAndDeletedFalse(customer.getCustomerUserId()).orElse(null);
+
+        List<Map<String, Object>> items = events.stream()
+                .map(event -> toTimelineItem(
+                        event,
+                        "appointment".equals(event.getAggregateType())
+                                ? appointments.get(event.getAggregateId()) : null,
+                        "report".equals(event.getAggregateType())
+                                ? reports.get(event.getAggregateId()) : null,
+                        "report_lead".equals(event.getAggregateType())
+                                ? leads.get(event.getAggregateId()) : null,
+                        event.getActorUserId() == null ? null : actors.get(event.getActorUserId())
+                ))
+                .toList();
+
+        Map<String, Object> result = new LinkedHashMap<>();
+        result.put("customer", customerView(customer, customerUser));
+        result.put("total", eventPage.getTotalElements());
+        result.put("page", safePage);
+        result.put("pageSize", safeSize);
+        result.put("hasMore", safePage < eventPage.getTotalPages());
+        result.put("list", items);
+        return result;
+    }
+
+    private StoreCustomer resolveCanonicalCustomer(Long storeId, StoreCustomer requestedCustomer) {
+        if (!Boolean.TRUE.equals(requestedCustomer.getDeleted())) {
+            return requestedCustomer;
+        }
+        Long canonicalId = requestedCustomer.getMergedIntoStoreCustomerId();
+        if (canonicalId == null) {
+            throw new FlowException(404, "STORE_CUSTOMER_NOT_FOUND", "客户不存在");
+        }
+        return storeCustomerMapper
+                .findFirstByIdAndStoreIdAndDeletedFalse(canonicalId, storeId)
+                .orElseThrow(() -> new FlowException(404, "STORE_CUSTOMER_NOT_FOUND", "客户不存在"));
+    }
+
+    private Map<Long, Appointment> loadAppointments(Long storeId, List<BusinessEvent> events) {
+        Set<Long> ids = aggregateIds(events, "appointment");
+        if (ids.isEmpty()) return Map.of();
+        return appointmentMapper.findAllById(ids).stream()
+                .filter(a -> Objects.equals(storeId, a.getStoreId()) && !Boolean.TRUE.equals(a.getDeleted()))
+                .collect(Collectors.toMap(Appointment::getId, Function.identity(), (a, b) -> a));
+    }
+
+    private Map<Long, Report> loadReports(Long storeId, List<BusinessEvent> events) {
+        Set<Long> ids = aggregateIds(events, "report");
+        if (ids.isEmpty()) return Map.of();
+        return reportMapper.findAllById(ids).stream()
+                .filter(r -> Objects.equals(storeId, r.getStoreId()) && !Boolean.TRUE.equals(r.getDeleted()))
+                .collect(Collectors.toMap(Report::getId, Function.identity(), (a, b) -> a));
+    }
+
+    private Map<Long, ReportLead> loadLeads(Long storeId, List<BusinessEvent> events) {
+        Set<Long> ids = aggregateIds(events, "report_lead");
+        if (ids.isEmpty()) return Map.of();
+        return reportLeadMapper.findAllById(ids).stream()
+                .filter(l -> Objects.equals(storeId, l.getStoreId()))
+                .collect(Collectors.toMap(ReportLead::getId, Function.identity(), (a, b) -> a));
+    }
+
+    private Map<Long, User> loadActors(List<BusinessEvent> events) {
+        Set<Long> ids = events.stream()
+                .map(BusinessEvent::getActorUserId)
+                .filter(Objects::nonNull)
+                .collect(Collectors.toCollection(LinkedHashSet::new));
+        if (ids.isEmpty()) return Map.of();
+        Map<Long, User> result = new HashMap<>();
+        for (User user : userMapper.findAllById(ids)) {
+            result.put(user.getId(), user);
+        }
+        return result;
+    }
+
+    private static Set<Long> aggregateIds(List<BusinessEvent> events, String aggregateType) {
+        return events.stream()
+                .filter(e -> aggregateType.equals(e.getAggregateType()))
+                .map(BusinessEvent::getAggregateId)
+                .filter(Objects::nonNull)
+                .collect(Collectors.toCollection(LinkedHashSet::new));
+    }
+
+    private Map<String, Object> toTimelineItem(
+            BusinessEvent event,
+            Appointment appointment,
+            Report report,
+            ReportLead lead,
+            User actor
+    ) {
+        Map<String, Object> metadata = safeMetadata(event.getMetadataJson());
+        Map<String, Object> item = new LinkedHashMap<>();
+        item.put("eventId", event.getEventId());
+        item.put("eventType", event.getEventType());
+        item.put("occurredAt", iso(event.getOccurredAt()));
+        item.put("title", title(event.getEventType(), metadata));
+        item.put("description", description(event, appointment, report, lead, metadata));
+        item.put("source", event.getSource());
+        item.put("actorRole", event.getActorRole());
+        item.put("actorName", safeActorName(actor));
+        if (appointment != null && "appointment".equals(event.getAggregateType())) {
+            item.put("appointment", appointmentView(appointment));
+        }
+        if (report != null && "report".equals(event.getAggregateType())) {
+            item.put("report", reportView(report));
+        }
+        if (lead != null && "report_lead".equals(event.getAggregateType())) {
+            item.put("lead", leadView(lead));
+        }
+        return item;
+    }
+
+    private static Map<String, Object> customerView(StoreCustomer customer, User user) {
+        Map<String, Object> view = new LinkedHashMap<>();
+        view.put("storeCustomerId", customer.getId());
+        view.put("displayName", firstNonBlank(
+                customer.getDisplayName(), user == null ? null : user.getName(), "客户"
+        ));
+        view.put("phoneMasked", AdminServiceCustomerService.maskPhone(firstNonBlank(
+                customer.getPhone(), user == null ? null : user.getPhone()
+        )));
+        view.put("originSource", customer.getSource());
+        view.put("firstContactAt", iso(customer.getFirstContactAt()));
+        view.put("lastContactAt", iso(customer.getLastContactAt()));
+        return view;
+    }
+
+    private static Map<String, Object> appointmentView(Appointment appointment) {
+        Map<String, Object> view = new LinkedHashMap<>();
+        view.put("id", appointment.getId());
+        view.put("appointmentTime", iso(appointment.getAppointmentTime()));
+        view.put("endTime", iso(appointment.getEndTime()));
+        view.put("petName", appointment.getPetName());
+        view.put("petType", appointment.getPetType());
+        view.put("serviceType", appointment.getServiceType());
+        view.put("durationMinutes", appointment.resolvedDurationMinutes());
+        view.put("currentStatus", appointment.getStatus());
+        return view;
+    }
+
+    private static Map<String, Object> reportView(Report report) {
+        Map<String, Object> view = new LinkedHashMap<>();
+        view.put("id", report.getId());
+        view.put("appointmentId", report.getAppointmentId());
+        view.put("petName", report.getPetName());
+        view.put("serviceType", report.getServiceType());
+        view.put("sendStatus", report.getSendStatus());
+        view.put("sentAt", iso(report.getSentAt()));
+        view.put("sendChannel", report.getSendChannel());
+        return view;
+    }
+
+    private static Map<String, Object> leadView(ReportLead lead) {
+        Map<String, Object> view = new LinkedHashMap<>();
+        view.put("id", lead.getId());
+        view.put("reportId", lead.getReportId());
+        view.put("petName", lead.getPetName());
+        view.put("serviceType", lead.getServiceType());
+        view.put("remindDate", lead.getRemindDate() == null ? null : lead.getRemindDate().toString());
+        view.put("remindStatus", lead.getRemindStatus());
+        return view;
+    }
+
+    private static String title(String eventType, Map<String, Object> metadata) {
+        if (BusinessEventService.APPOINTMENT_CREATED.equals(eventType)) return "预约已创建";
+        if (BusinessEventService.APPOINTMENT_STATUS_CHANGED.equals(eventType)) {
+            return switch (text(metadata.get("toStatus"))) {
+                case "cancel" -> "预约已取消";
+                case "doing" -> "预约进入服务中";
+                case "done" -> "预约已完成";
+                default -> "预约状态已更新";
+            };
+        }
+        if (BusinessEventService.SERVICE_STARTED.equals(eventType)) return "开始服务";
+        if (BusinessEventService.SERVICE_COMPLETED.equals(eventType)) return "服务完成";
+        if (BusinessEventService.REPORT_SUBMITTED.equals(eventType)) return "服务报告已提交";
+        if (BusinessEventService.REPORT_SENT.equals(eventType)) return "报告已确认发送";
+        if (BusinessEventService.REPORT_OPENED.equals(eventType)) return "宠主首次打开报告";
+        if (BusinessEventService.REPORT_REOPENED.equals(eventType)) return "宠主再次打开报告";
+        if (BusinessEventService.LEAD_SUBMITTED.equals(eventType)) return "宠主提交下次服务提醒";
+        return "客户业务动态";
+    }
+
+    private static String description(
+            BusinessEvent event,
+            Appointment appointment,
+            Report report,
+            ReportLead lead,
+            Map<String, Object> metadata
+    ) {
+        List<String> parts = new ArrayList<>();
+        if (appointment != null) {
+            add(parts, appointment.getPetName());
+            add(parts, appointment.getServiceType());
+            add(parts, iso(appointment.getAppointmentTime()));
+        } else if (report != null) {
+            add(parts, report.getPetName());
+            add(parts, report.getServiceType());
+        } else if (lead != null) {
+            add(parts, lead.getPetName());
+            add(parts, lead.getServiceType());
+            if (lead.getRemindDate() != null) add(parts, "建议 " + lead.getRemindDate());
+        }
+        if (BusinessEventService.APPOINTMENT_STATUS_CHANGED.equals(event.getEventType())) {
+            String from = text(metadata.get("fromStatus"));
+            String to = text(metadata.get("toStatus"));
+            if (!from.isBlank() || !to.isBlank()) add(parts, statusLabel(from) + " → " + statusLabel(to));
+        } else if (BusinessEventService.REPORT_SENT.equals(event.getEventType())) {
+            add(parts, channelLabel(text(metadata.get("channel"))));
+        } else if (BusinessEventService.LEAD_SUBMITTED.equals(event.getEventType())
+                && Boolean.TRUE.equals(metadata.get("repeatSubmit"))) {
+            add(parts, "重复提交已合并");
+        }
+        return parts.isEmpty() ? "已记录业务事实" : String.join(" · ", parts);
+    }
+
+    private Map<String, Object> safeMetadata(String json) {
+        if (json == null || json.isBlank()) return Map.of();
+        try {
+            Map<String, Object> parsed = objectMapper.readValue(json, METADATA_TYPE);
+            Map<String, Object> safe = new LinkedHashMap<>();
+            for (String key : List.of("fromStatus", "toStatus", "channel", "repeatSubmit")) {
+                Object value = parsed.get(key);
+                if (value instanceof String || value instanceof Boolean || value instanceof Number) {
+                    safe.put(key, value);
+                }
+            }
+            return safe;
+        } catch (Exception ignored) {
+            return Map.of();
+        }
+    }
+
+    private static String safeActorName(User actor) {
+        return actor == null ? null : firstNonBlank(actor.getName());
+    }
+
+    private static String firstNonBlank(String... values) {
+        for (String value : values) {
+            if (value != null && !value.isBlank()) return value.trim();
+        }
+        return null;
+    }
+
+    private static void add(List<String> parts, String value) {
+        if (value != null && !value.isBlank()) parts.add(value);
+    }
+
+    private static String iso(LocalDateTime value) {
+        return value == null ? null : value.toString();
+    }
+
+    private static String text(Object value) {
+        return value == null ? "" : value.toString().trim().toLowerCase(Locale.ROOT);
+    }
+
+    private static String statusLabel(String status) {
+        return switch (status) {
+            case "new" -> "待开始";
+            case "doing" -> "服务中";
+            case "done" -> "已完成";
+            case "cancel" -> "已取消";
+            case "unknown", "" -> "未知";
+            default -> status;
+        };
+    }
+
+    private static String channelLabel(String channel) {
+        return switch (channel) {
+            case "wechat" -> "微信消息";
+            case "qr" -> "当面扫码";
+            case "other" -> "其他方式";
+            default -> channel.isBlank() ? null : channel;
+        };
+    }
+}
diff --git a/src/test/java/com/petstore/controller/AdminServiceCustomerControllerTest.java b/src/test/java/com/petstore/controller/AdminServiceCustomerControllerTest.java
index 6470432..aabf6f8 100644
--- a/src/test/java/com/petstore/controller/AdminServiceCustomerControllerTest.java
+++ b/src/test/java/com/petstore/controller/AdminServiceCustomerControllerTest.java
@@ -3,6 +3,7 @@ package com.petstore.controller;
 import com.petstore.auth.CurrentUser;
 import com.petstore.auth.CurrentUserContext;
 import com.petstore.service.AdminServiceCustomerService;
+import com.petstore.service.StoreCustomerTimelineService;
 import org.junit.jupiter.api.AfterEach;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.extension.ExtendWith;
@@ -30,6 +31,9 @@ class AdminServiceCustomerControllerTest {
     @Mock
     private AdminServiceCustomerService adminServiceCustomerService;
 
+    @Mock
+    private StoreCustomerTimelineService storeCustomerTimelineService;
+
     @InjectMocks
     private AdminServiceCustomerController controller;
 
@@ -100,4 +104,32 @@ class AdminServiceCustomerControllerTest {
         Map<String, Object> summary = (Map<String, Object>) data.get("summary");
         assertFalse(summary.containsKey("totalBalance"));
     }
+
+    @Test
+    void timelineCustomerForbidden() {
+        CurrentUserContext.set(new CurrentUser(99L, null, "customer"));
+
+        Map<String, Object> result = controller.timeline(20L, 1, 20);
+
+        assertEquals(403, result.get("code"));
+        verifyNoInteractions(storeCustomerTimelineService);
+    }
+
+    @Test
+    void timelineUsesSessionStoreScope() {
+        CurrentUserContext.set(new CurrentUser(2L, 10L, "staff"));
+        when(storeCustomerTimelineService.timeline(10L, 20L, 1, 20)).thenReturn(Map.of(
+                "customer", Map.of("storeCustomerId", 20L),
+                "total", 0L,
+                "page", 1,
+                "pageSize", 20,
+                "hasMore", false,
+                "list", List.of()
+        ));
+
+        Map<String, Object> result = controller.timeline(20L, 1, 20);
+
+        assertEquals(200, result.get("code"));
+        verify(storeCustomerTimelineService).timeline(10L, 20L, 1, 20);
+    }
 }
diff --git a/src/test/java/com/petstore/mapper/StoreCustomerTimelineMigrationTest.java b/src/test/java/com/petstore/mapper/StoreCustomerTimelineMigrationTest.java
new file mode 100644
index 0000000..512be88
--- /dev/null
+++ b/src/test/java/com/petstore/mapper/StoreCustomerTimelineMigrationTest.java
@@ -0,0 +1,61 @@
+package com.petstore.mapper;
+
+import org.h2.tools.RunScript;
+import org.junit.jupiter.api.Test;
+
+import java.io.Reader;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.ResultSet;
+import java.sql.Statement;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+class StoreCustomerTimelineMigrationTest {
+
+    @Test
+    void migrationAddsCanonicalAliasWithoutRewritingCustomerHistory() throws Exception {
+        try (Connection connection = DriverManager.getConnection(
+                "jdbc:h2:mem:store-customer-timeline-migration;MODE=MySQL;DATABASE_TO_LOWER=TRUE",
+                "sa",
+                ""
+        )) {
+            try (Statement statement = connection.createStatement()) {
+                statement.execute("""
+                        CREATE TABLE t_store_customer (
+                            id BIGINT PRIMARY KEY,
+                            store_id BIGINT NOT NULL,
+                            deleted TINYINT NOT NULL DEFAULT 0
+                        )
+                        """);
+            }
+
+            try (Reader reader = Files.newBufferedReader(
+                    Path.of("db/migrations/20260802_create_store_customer_timeline.sql")
+            )) {
+                RunScript.execute(connection, reader);
+            }
+
+            try (Statement statement = connection.createStatement()) {
+                statement.execute("INSERT INTO t_store_customer VALUES (50, 10, 0, NULL)");
+                statement.execute("INSERT INTO t_store_customer VALUES (51, 10, 1, 50)");
+                try (ResultSet rows = statement.executeQuery("""
+                        SELECT COUNT(*) AS invalid_count
+                        FROM t_store_customer sc_alias
+                        LEFT JOIN t_store_customer canonical
+                          ON canonical.id = sc_alias.merged_into_store_customer_id
+                         AND canonical.store_id = sc_alias.store_id
+                         AND canonical.deleted = 0
+                         AND canonical.merged_into_store_customer_id IS NULL
+                        WHERE sc_alias.merged_into_store_customer_id IS NOT NULL
+                          AND canonical.id IS NULL
+                        """)) {
+                    rows.next();
+                    assertEquals(0L, rows.getLong("invalid_count"));
+                }
+            }
+        }
+    }
+}
diff --git a/src/test/java/com/petstore/service/StoreCustomerServiceTest.java b/src/test/java/com/petstore/service/StoreCustomerServiceTest.java
index 539eb0d..793c94f 100644
--- a/src/test/java/com/petstore/service/StoreCustomerServiceTest.java
+++ b/src/test/java/com/petstore/service/StoreCustomerServiceTest.java
@@ -125,6 +125,7 @@ class StoreCustomerServiceTest {
         assertEquals("13800138001", saved.getPhone());
         assertTrue(phoneProjection.getDeleted());
         assertNull(phoneProjection.getPhone());
+        assertEquals(1L, phoneProjection.getMergedIntoStoreCustomerId());
         verify(storeCustomerMapper).saveAndFlush(phoneProjection);
         ArgumentCaptor<StoreCustomer> captor = ArgumentCaptor.forClass(StoreCustomer.class);
         verify(storeCustomerMapper).save(captor.capture());
diff --git a/src/test/java/com/petstore/service/StoreCustomerTimelineServiceTest.java b/src/test/java/com/petstore/service/StoreCustomerTimelineServiceTest.java
new file mode 100644
index 0000000..482e8b1
--- /dev/null
+++ b/src/test/java/com/petstore/service/StoreCustomerTimelineServiceTest.java
@@ -0,0 +1,239 @@
+package com.petstore.service;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.petstore.entity.Appointment;
+import com.petstore.entity.BusinessEvent;
+import com.petstore.entity.Report;
+import com.petstore.entity.ReportLead;
+import com.petstore.entity.StoreCustomer;
+import com.petstore.entity.User;
+import com.petstore.mapper.AppointmentMapper;
+import com.petstore.mapper.BusinessEventMapper;
+import com.petstore.mapper.ReportLeadMapper;
+import com.petstore.mapper.ReportMapper;
+import com.petstore.mapper.StoreCustomerMapper;
+import com.petstore.mapper.UserMapper;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.Mock;
+import org.mockito.junit.jupiter.MockitoExtension;
+import org.springframework.data.domain.PageImpl;
+import org.springframework.data.domain.Pageable;
+
+import java.time.LocalDate;
+import java.time.LocalDateTime;
+import java.util.List;
+import java.util.Map;
+import java.util.Optional;
+import java.util.Set;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.argThat;
+import static org.mockito.ArgumentMatchers.eq;
+import static org.mockito.Mockito.never;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+@ExtendWith(MockitoExtension.class)
+class StoreCustomerTimelineServiceTest {
+
+    @Mock private StoreCustomerMapper storeCustomerMapper;
+    @Mock private BusinessEventMapper businessEventMapper;
+    @Mock private AppointmentMapper appointmentMapper;
+    @Mock private ReportMapper reportMapper;
+    @Mock private ReportLeadMapper reportLeadMapper;
+    @Mock private UserMapper userMapper;
+
+    private StoreCustomerTimelineService service;
+
+    @BeforeEach
+    void setUp() {
+        service = new StoreCustomerTimelineService(
+                storeCustomerMapper,
+                businessEventMapper,
+                appointmentMapper,
+                reportMapper,
+                reportLeadMapper,
+                userMapper,
+                new ObjectMapper()
+        );
+    }
+
+    @SuppressWarnings("unchecked")
+    @Test
+    void timelineReturnsStableOrderedLowSensitivityFacts() {
+        StoreCustomer customer = customer();
+        BusinessEvent canceled = event(
+                3L, "event-cancel", BusinessEventService.APPOINTMENT_STATUS_CHANGED,
+                "appointment", 100L, "{\"fromStatus\":\"new\",\"toStatus\":\"cancel\",\"token\":\"sensitive-token\"}"
+        );
+        BusinessEvent sent = event(
+                2L, "event-sent", BusinessEventService.REPORT_SENT,
+                "report", 200L, "{\"channel\":\"wechat\",\"phone\":\"13800138001\"}"
+        );
+        BusinessEvent leadSubmitted = event(
+                1L, "event-lead", BusinessEventService.LEAD_SUBMITTED,
+                "report_lead", 300L, "{\"repeatSubmit\":true}"
+        );
+
+        Appointment appointment = new Appointment();
+        appointment.setId(100L);
+        appointment.setStoreId(10L);
+        appointment.setPetName("豆豆");
+        appointment.setServiceType("洗护");
+        appointment.setAppointmentTime(LocalDateTime.of(2026, 8, 1, 10, 0));
+        appointment.setDurationMinutes(60);
+        appointment.setStatus("cancel");
+        appointment.setRemark("不得返回的私密备注");
+        appointment.setDeleted(false);
+
+        Report report = new Report();
+        report.setId(200L);
+        report.setStoreId(10L);
+        report.setAppointmentId(100L);
+        report.setPetName("豆豆");
+        report.setServiceType("洗护");
+        report.setSendStatus("sent");
+        report.setSendChannel("wechat");
+        report.setReportToken("不得返回的报告口令");
+        report.setDeleted(false);
+
+        ReportLead lead = new ReportLead();
+        lead.setId(300L);
+        lead.setStoreId(10L);
+        lead.setReportId(200L);
+        lead.setPetName("豆豆");
+        lead.setServiceType("洗护");
+        lead.setPhone("13800138001");
+        lead.setRemindDate(LocalDate.of(2026, 9, 1));
+        lead.setRemindStatus("pending");
+
+        User customerUser = new User();
+        customerUser.setId(88L);
+        customerUser.setName("豆豆家长");
+        customerUser.setPhone("13800138001");
+
+        when(storeCustomerMapper.findFirstByIdAndStoreId(50L, 10L))
+                .thenReturn(Optional.of(customer));
+        when(storeCustomerMapper.findByStoreIdAndMergedIntoStoreCustomerId(10L, 50L))
+                .thenReturn(List.of());
+        when(businessEventMapper.findByStoreIdAndStoreCustomerIdIn(any(), any(), any(Pageable.class)))
+                .thenAnswer(invocation -> new PageImpl<>(
+                        List.of(canceled, sent, leadSubmitted), invocation.getArgument(2), 3
+                ));
+        when(appointmentMapper.findAllById(any())).thenReturn(List.of(appointment));
+        when(reportMapper.findAllById(any())).thenReturn(List.of(report));
+        when(reportLeadMapper.findAllById(any())).thenReturn(List.of(lead));
+        when(userMapper.findByIdAndDeletedFalse(88L)).thenReturn(Optional.of(customerUser));
+
+        Map<String, Object> result = service.timeline(10L, 50L, 1, 20);
+
+        assertEquals(3L, result.get("total"));
+        assertEquals(false, result.get("hasMore"));
+        Map<String, Object> customerView = (Map<String, Object>) result.get("customer");
+        assertEquals("138****8001", customerView.get("phoneMasked"));
+        List<Map<String, Object>> items = (List<Map<String, Object>>) result.get("list");
+        assertEquals("预约已取消", items.get(0).get("title"));
+        assertEquals("报告已确认发送", items.get(1).get("title"));
+        assertEquals("宠主提交下次服务提醒", items.get(2).get("title"));
+        Map<String, Object> appointmentView = (Map<String, Object>) items.get(0).get("appointment");
+        assertFalse(appointmentView.containsKey("remark"));
+        String responseText = result.toString();
+        assertFalse(responseText.contains("13800138001"));
+        assertFalse(responseText.contains("sensitive-token"));
+        assertFalse(responseText.contains("不得返回"));
+    }
+
+    @Test
+    void crossStoreCustomerIsNotDisclosed() {
+        when(storeCustomerMapper.findFirstByIdAndStoreId(50L, 10L))
+                .thenReturn(Optional.empty());
+
+        FlowException error = assertThrows(
+                FlowException.class,
+                () -> service.timeline(10L, 50L, 1, 20)
+        );
+
+        assertEquals("STORE_CUSTOMER_NOT_FOUND", error.bizCode());
+        verify(businessEventMapper, never()).findByStoreIdAndStoreCustomerIdIn(any(), any(), any());
+    }
+
+    @SuppressWarnings("unchecked")
+    @Test
+    void mergedProjectionResolvesToCanonicalAndKeepsItsImmutableEvents() {
+        StoreCustomer canonical = customer();
+        StoreCustomer alias = new StoreCustomer();
+        alias.setId(51L);
+        alias.setStoreId(10L);
+        alias.setMergedIntoStoreCustomerId(50L);
+        alias.setDeleted(true);
+        BusinessEvent historicalLead = event(
+                4L, "event-historical-lead", BusinessEventService.LEAD_SUBMITTED,
+                "report_lead", 301L, "{}"
+        );
+        historicalLead.setStoreCustomerId(51L);
+
+        when(storeCustomerMapper.findFirstByIdAndStoreId(51L, 10L)).thenReturn(Optional.of(alias));
+        when(storeCustomerMapper.findFirstByIdAndStoreIdAndDeletedFalse(50L, 10L))
+                .thenReturn(Optional.of(canonical));
+        when(storeCustomerMapper.findByStoreIdAndMergedIntoStoreCustomerId(10L, 50L))
+                .thenReturn(List.of(alias));
+        when(businessEventMapper.findByStoreIdAndStoreCustomerIdIn(any(), any(), any(Pageable.class)))
+                .thenAnswer(invocation -> new PageImpl<>(
+                        List.of(historicalLead), invocation.getArgument(2), 1
+                ));
+        when(reportLeadMapper.findAllById(any())).thenReturn(List.of());
+        when(userMapper.findByIdAndDeletedFalse(88L)).thenReturn(Optional.empty());
+
+        Map<String, Object> result = service.timeline(10L, 51L, 1, 20);
+
+        Map<String, Object> customerView = (Map<String, Object>) result.get("customer");
+        assertEquals(50L, customerView.get("storeCustomerId"));
+        assertEquals(1L, result.get("total"));
+        verify(businessEventMapper).findByStoreIdAndStoreCustomerIdIn(
+                eq(10L),
+                argThat(ids -> Set.copyOf(ids).equals(Set.of(50L, 51L))),
+                any(Pageable.class)
+        );
+    }
+
+    private static StoreCustomer customer() {
+        StoreCustomer customer = new StoreCustomer();
+        customer.setId(50L);
+        customer.setStoreId(10L);
+        customer.setCustomerUserId(88L);
+        customer.setPhone("13800138001");
+        customer.setDisplayName("豆豆家长");
+        customer.setSource(StoreCustomerService.SOURCE_CUSTOMER_BOOKING);
+        customer.setFirstContactAt(LocalDateTime.of(2026, 7, 1, 9, 0));
+        customer.setLastContactAt(LocalDateTime.of(2026, 8, 1, 10, 0));
+        customer.setDeleted(false);
+        return customer;
+    }
+
+    private static BusinessEvent event(
+            Long id,
+            String eventId,
+            String eventType,
+            String aggregateType,
+            Long aggregateId,
+            String metadata
+    ) {
+        BusinessEvent event = new BusinessEvent();
+        event.setId(id);
+        event.setEventId(eventId);
+        event.setEventType(eventType);
+        event.setStoreId(10L);
+        event.setStoreCustomerId(50L);
+        event.setAggregateType(aggregateType);
+        event.setAggregateId(aggregateId);
+        event.setSource("admin");
+        event.setOccurredAt(LocalDateTime.of(2026, 8, 1, 12, 0).plusMinutes(id));
+        event.setMetadataJson(metadata);
+        return event;
+    }
+}