fix: 完善商品—模特库-视频项目-自由创作等删除先进垃圾桶及可恢复等流程

core/backend/apps/ai/models.py

@@ -73,12 +73,14 @@ class ImageConversation(TeamOwnedModel):
         related_name="image_conversations",
     )
     is_deleted = models.BooleanField(default=False)
+    purged_at = models.DateTimeField(null=True, blank=True)
     # 每次在该对话里发起生成都刷新,左栏「最近」按它倒序
     last_active_at = models.DateTimeField(auto_now_add=True)
 
     class Meta:
         indexes = [
             models.Index(fields=["team", "mode", "-last_active_at"]),
+            models.Index(fields=["team", "is_deleted", "purged_at"]),
         ]
 
     def __str__(self) -> str:
@@ -149,6 +151,7 @@ class AITask(TeamOwnedModel):
     # 自由创作任务流的收藏 / 软删(其它任务类型恒 False,无行为影响)
     is_favorited = models.BooleanField(default=False)
     is_deleted = models.BooleanField(default=False)
+    purged_at = models.DateTimeField(null=True, blank=True)
 
     class Meta:
         indexes = [
@@ -163,6 +166,7 @@ class AITask(TeamOwnedModel):
             models.Index(fields=["team", "read_at"]),
             # 自由创作任务流:按团队 + 类型倒序分页
             models.Index(fields=["team", "task_type", "-created_at"]),
+            models.Index(fields=["team", "is_deleted", "purged_at"]),
         ]
 
     def __str__(self) -> str: