fix: v0.15.1 生成记录软删除 + 双重结算修复

1. 软删除：GenerationRecord 新增 is_deleted 字段，DELETE 接口改为标记不真删，
   用户生成列表/资产页/任务详情过滤已删除记录，消费记录和管理后台不过滤
2. 双重结算修复：前端轮询(video_task_detail_view)不再调火山API和结算，
   只读数据库状态，结算完全交给 Celery
3. _settle_payment 加防重入检查(frozen_amount==0 直接 return)
4. 部署需跑 migration 0016_add_is_deleted_to_generationrecord

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

backend/apps/generation/migrations/0016_add_is_deleted_to_generationrecord.py

@@ -0,0 +1,18 @@
+# Generated by Django 4.2.29 on 2026-03-31 05:03
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('generation', '0015_add_fast_token_price'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='generationrecord',
+            name='is_deleted',
+            field=models.BooleanField(default=False, verbose_name='用户已删除'),
+        ),
+    ]

backend/apps/generation/models.py

@@ -46,6 +46,7 @@ class GenerationRecord(models.Model):
     raw_error = models.TextField(blank=True, default='', verbose_name='原始错误信息')
     reference_urls = models.JSONField(default=list, blank=True, verbose_name='参考素材信息')
     is_favorited = models.BooleanField(default=False, verbose_name='已收藏')
+    is_deleted = models.BooleanField(default=False, verbose_name='用户已删除')
     seed = models.BigIntegerField(default=-1, verbose_name='种子值')
     created_at = models.DateTimeField(auto_now_add=True, db_index=True, verbose_name='创建时间')
     updated_at = models.DateTimeField(auto_now=True, verbose_name='更新时间')

backend/apps/generation/views.py

@@ -489,6 +489,8 @@ def _release_freeze(record):
 
 def _settle_payment(record, total_tokens):
     """任务完成时结算：按实际 tokens 扣费并释放冻结。"""
+    if record.frozen_amount == 0:
+        return  # 已结算，防止重复扣费
     team = record.user.team
     if not team:
         return
@@ -530,7 +532,7 @@ def video_tasks_list_view(request):
     page_size = min(_safe_int(request.query_params.get('page_size', 20), 20), 100)
     offset = max(_safe_int(request.query_params.get('offset', 0), 0), 0)
 
-    qs = user.generation_records.order_by('-created_at')
+    qs = user.generation_records.filter(is_deleted=False).order_by('-created_at')
     total = qs.count()
     records = _eval_qs(qs, limit=offset + page_size)
     # Apply offset after evaluation (defer compat)
@@ -547,73 +549,22 @@ def video_tasks_list_view(request):
 @api_view(['GET', 'DELETE'])
 @permission_classes([IsAuthenticated])
 def video_task_detail_view(request, task_id):
-    """GET /api/v1/video/tasks/<task_id> — Poll Seedance + refund on failure.
+    """GET /api/v1/video/tasks/<task_id> — Read task status from DB (settlement by Celery only).
-    DELETE /api/v1/video/tasks/<task_id> — Delete task record."""
+    DELETE /api/v1/video/tasks/<task_id> — Soft-delete task record."""
     try:
         record = _eval_qs(
-            GenerationRecord.objects.filter(user=request.user),
+            GenerationRecord.objects.filter(user=request.user, is_deleted=False),
             get_kwargs={'task_id': task_id},
         )
     except GenerationRecord.DoesNotExist:
         return Response({'error': '任务不存在'}, status=status.HTTP_404_NOT_FOUND)
 
     if request.method == 'DELETE':
-        record.delete()
+        record.is_deleted = True
+        record.save(update_fields=['is_deleted'])
         return Response(status=status.HTTP_204_NO_CONTENT)
 
-    # If task is still active, poll AirDrama API for latest status
+    # Frontend polling only reads DB state — settlement is handled exclusively by Celery
-    ark_task_id = record.__dict__.get('ark_task_id', '')
-    if record.status in ('queued', 'processing') and ark_task_id:
-        try:
-            ark_resp = query_task(ark_task_id)
-            new_status = map_status(ark_resp.get('status', ''))
-            record.status = new_status
-
-            # 保存火山返回的实际 seed 值
-            returned_seed = ark_resp.get('seed')
-            if returned_seed is not None:
-                record.seed = returned_seed
-
-            if new_status == 'completed':
-                video_url = extract_video_url(ark_resp)
-                if video_url:
-                    # Persist to TOS for permanent storage (Seedance URLs expire in 24h)
-                    try:
-                        from utils.tos_client import upload_from_url
-                        record.result_url = upload_from_url(video_url, folder='results')
-                    except Exception:
-                        logger.exception('Failed to persist video to TOS, using temporary URL')
-                        record.result_url = video_url
-                # 结算：按实际 tokens 扣费
-                usage = ark_resp.get('usage', {})
-                total_tokens = usage.get('total_tokens', 0) if isinstance(usage, dict) else 0
-                if total_tokens > 0:
-                    _settle_payment(record, total_tokens)
-                else:
-                    # API 没返回 tokens（异常），释放冻结不扣费
-                    _release_freeze(record)
-            elif new_status == 'failed':
-                error = ark_resp.get('error', {})
-                code = error.get('code', '') if isinstance(error, dict) else ''
-                raw_msg = error.get('message', '') if isinstance(error, dict) else str(error)
-                from utils.airdrama_client import ERROR_MESSAGES
-                record.error_message = ERROR_MESSAGES.get(code, raw_msg)
-                record.raw_error = f'{code}: {raw_msg}' if code else raw_msg
-                # 失败时检查是否产生了 token 消耗
-                usage = ark_resp.get('usage', {})
-                total_tokens = usage.get('total_tokens', 0) if isinstance(usage, dict) else 0
-                if total_tokens > 0:
-                    # Seedance 已计费，按实际扣费（允许透支）
-                    _settle_payment(record, total_tokens)
-                else:
-                    # Seedance 未计费，释放冻结
-                    _release_freeze(record)
-
-            if new_status in ('completed', 'failed'):
-                record.completed_at = timezone.now()
-            record.save(update_fields=['status', 'result_url', 'error_message', 'raw_error', 'seed', 'completed_at'])
-        except Exception as e:
-            logger.exception('AirDrama API query failed for %s', ark_task_id)
 
     return Response(_serialize_task(record))