fix: 状态枚举添加_missing_兼容历史脏数据，修复Staging 500 #809

根因：Staging PostgreSQL有历史脏数据（如success/done等旧状态值），
GenerationTaskStatus/EditPlanStatus/EditPlanClipStatus枚举缺少_missing_
兼容方法，导致枚举转换抛ValueError触发500。

修复：参照AssetStatus/ClassificationJobStatus的模式，给三个枚举都加上
_missing_方法，兼容常见历史别名，未知值兜底到初始态（不阻塞业务）。

修改范围：
- packages/domain/generation_task.py: GenerationTaskStatus._missing_
- packages/domain/edit_plan.py: EditPlanStatus._missing_
- packages/domain/edit_plan_clip.py: EditPlanClipStatus._missing_
- tests/unit/test_generation_task_status_enum.py: 32个兼容性单测

packages/domain/edit_plan.py

@@ -28,6 +28,28 @@ class EditPlanStatus(StrEnum):
     COMPLETED = "completed"
     FAILED = "failed"
 
+    @classmethod
+    def _missing_(cls, value: object) -> "EditPlanStatus":
+        """兼容历史脏数据，避免枚举转换失败导致500。
+
+        - success/done/finished/complete → COMPLETED
+        - fail/error/err → FAILED
+        - render/rendering → RENDERING
+        - edit/editing → EDITING
+        - 其他未知值 → DRAFT（兜底，不阻塞业务）
+        """
+        if isinstance(value, str):
+            normalized = value.strip().lower()
+            if normalized in ("done", "success", "finished", "complete", "completed"):
+                return cls.COMPLETED
+            if normalized in ("fail", "failed", "error", "err"):
+                return cls.FAILED
+            if normalized in ("render", "rendering", "generating", "generating_video"):
+                return cls.RENDERING
+            if normalized in ("edit", "editing", "working"):
+                return cls.EDITING
+        return cls.DRAFT
+
 
 @dataclass(slots=True)
 class EditPlan:

packages/domain/edit_plan_clip.py

@@ -31,6 +31,25 @@ class EditPlanClipStatus(StrEnum):
     RENDERED = "rendered"  # 已渲染
     FAILED = "failed"  # 渲染失败
 
+    @classmethod
+    def _missing_(cls, value: object) -> "EditPlanClipStatus":
+        """兼容历史脏数据，避免枚举转换失败导致500。
+
+        - success/done/finished/complete/rendered → RENDERED
+        - fail/error/err → FAILED
+        - ready/available → READY
+        - 其他未知值 → PENDING（兜底，不阻塞业务）
+        """
+        if isinstance(value, str):
+            normalized = value.strip().lower()
+            if normalized in ("done", "success", "finished", "complete", "rendered", "render"):
+                return cls.RENDERED
+            if normalized in ("fail", "failed", "error", "err"):
+                return cls.FAILED
+            if normalized in ("ready", "available", "prepared"):
+                return cls.READY
+        return cls.PENDING
+
 
 @dataclass(slots=True)
 class EditPlanClip:

packages/domain/generation_task.py

@@ -43,6 +43,28 @@ class GenerationTaskStatus(StrEnum):
     CANCELLED = "cancelled"
     """已取消（用户取消或系统取消）"""
 
+    @classmethod
+    def _missing_(cls, value: object) -> "GenerationTaskStatus":
+        """兼容历史脏数据，避免枚举转换失败导致500。
+
+        - success/done/finished/complete → COMPLETED
+        - fail/error/err → FAILED
+        - process/processing/run/running → RUNNING
+        - cancel/canceled → CANCELLED
+        - 其他未知值 → PENDING（兜底，不阻塞业务）
+        """
+        if isinstance(value, str):
+            normalized = value.strip().lower()
+            if normalized in ("done", "success", "finished", "complete", "completed"):
+                return cls.COMPLETED
+            if normalized in ("fail", "failed", "error", "err"):
+                return cls.FAILED
+            if normalized in ("process", "processing", "run", "running", "in_progress"):
+                return cls.RUNNING
+            if normalized in ("cancel", "cancelled", "canceled"):
+                return cls.CANCELLED
+        return cls.PENDING
+
 
 # 终态集合
 TERMINAL_STATUSES = frozenset(

tests/unit/test_generation_task_status_enum.py

@@ -0,0 +1,81 @@
+"""GenerationTaskStatus 枚举兼容性测试。
+
+验证历史脏数据（如 'success'/'done'）不会导致枚举转换失败。
+关联 Issue: #809 [Staging] E2E测试失败 - 模板生成接口返回500
+"""
+
+import pytest
+
+from packages.domain.generation_task import GenerationTaskStatus
+
+
+class TestGenerationTaskStatusNormalValues:
+    """正常值应该正确映射。"""
+
+    def test_pending(self):
+        assert GenerationTaskStatus("pending") == GenerationTaskStatus.PENDING
+
+    def test_running(self):
+        assert GenerationTaskStatus("running") == GenerationTaskStatus.RUNNING
+
+    def test_completed(self):
+        assert GenerationTaskStatus("completed") == GenerationTaskStatus.COMPLETED
+
+    def test_failed(self):
+        assert GenerationTaskStatus("failed") == GenerationTaskStatus.FAILED
+
+    def test_cancelled(self):
+        assert GenerationTaskStatus("cancelled") == GenerationTaskStatus.CANCELLED
+
+
+class TestGenerationTaskStatusHistoricalValues:
+    """历史脏数据应该正确映射到对应状态，不抛异常。"""
+
+    @pytest.mark.parametrize("value", ["done", "success", "finished", "complete", "completed"])
+    def test_completed_like_values_map_to_completed(self, value):
+        assert GenerationTaskStatus(value) == GenerationTaskStatus.COMPLETED
+
+    @pytest.mark.parametrize("value", ["fail", "failed", "error", "err"])
+    def test_failed_like_values_map_to_failed(self, value):
+        assert GenerationTaskStatus(value) == GenerationTaskStatus.FAILED
+
+    @pytest.mark.parametrize("value", ["process", "processing", "run", "running", "in_progress"])
+    def test_running_like_values_map_to_running(self, value):
+        assert GenerationTaskStatus(value) == GenerationTaskStatus.RUNNING
+
+    @pytest.mark.parametrize("value", ["cancel", "cancelled", "canceled"])
+    def test_cancelled_like_values_map_to_cancelled(self, value):
+        assert GenerationTaskStatus(value) == GenerationTaskStatus.CANCELLED
+
+    @pytest.mark.parametrize("value", [" Done ", "SUCCESS", "  failed  "])
+    def test_whitespace_and_case_insensitive(self, value):
+        """带空格和大小写不影响匹配。"""
+        # 只要能找到对应状态且不抛异常即可
+        result = GenerationTaskStatus(value)
+        assert result in (
+            GenerationTaskStatus.COMPLETED,
+            GenerationTaskStatus.FAILED,
+        )
+
+
+class TestGenerationTaskStatusFallback:
+    """完全未知的值兜底为 PENDING，不抛500。"""
+
+    @pytest.mark.parametrize("value", ["unknown", "foo_bar", "deleted", ""])
+    def test_unknown_value_falls_back_to_pending(self, value):
+        assert GenerationTaskStatus(value) == GenerationTaskStatus.PENDING
+
+    def test_none_value_falls_back_to_pending(self):
+        assert GenerationTaskStatus(None) == GenerationTaskStatus.PENDING  # type: ignore[arg-type]
+
+    def test_int_value_falls_back_to_pending(self):
+        assert GenerationTaskStatus(123) == GenerationTaskStatus.PENDING  # type: ignore[arg-type]
+
+
+class TestGenerationTaskStatusStrValue:
+    """枚举值仍为字符串类型，不影响序列化。"""
+
+    def test_value_unchanged(self):
+        assert GenerationTaskStatus.PENDING.value == "pending"
+        assert GenerationTaskStatus.COMPLETED.value == "completed"
+        assert isinstance(GenerationTaskStatus.PENDING, str)