M3a：息壤三级记忆域——归真触发提取管线/白名单明忆/重忆确认/正影版本链/删除墓碑/双通道召回注入，退役旧记忆-抽取-反思-大周天-演化管线（迁移 004，验收 7 用例）

backend/app/api/v1/endpoints/admin.py

@@ -387,7 +387,7 @@ async def admin_tenants_overview() -> list[_TenantUserOverview]:
 
     from app.db.session import AsyncSessionLocal
     from app.models.character import Character
-    from app.models.memory import Memory
+    from app.models.xirang import Memory
     from app.models.user import User
 
     async with AsyncSessionLocal() as session:
@@ -406,7 +406,7 @@ async def admin_tenants_overview() -> list[_TenantUserOverview]:
             mem_count = await session.scalar(
                 select(func.count())
                 .select_from(Memory)
-                .join(Character, Memory.character_id == Character.id)
+                .join(Character, Memory.character_id == Character.id).where(Memory.status != "tombstoned")
                 .where(
                     Character.owner_scope == user.id,
                     Character.is_system_template.is_(False),
@@ -454,13 +454,13 @@ async def admin_tenant_memories(user_id: str) -> list[dict]:
 
     from app.db.session import AsyncSessionLocal
     from app.models.character import Character
-    from app.models.memory import Memory
+    from app.models.xirang import Memory
     from app.services.serializers import memory_to_response
 
     async with AsyncSessionLocal() as session:
         result = await session.execute(
             select(Memory)
-            .join(Character, Memory.character_id == Character.id)
+            .join(Character, Memory.character_id == Character.id).where(Memory.status != "tombstoned")
             .where(
                 Character.owner_scope == user_id,
                 Character.is_system_template.is_(False),