feat(phase3): 清理EditPlan表冗余字段result_count

- 删除EditPlan领域模型/仓储/DB模型中的result_count字段
- 清理worker中对plan.result_count的写入
- 创建048 migration删除edit_plans.result_count列
- 该字段为剪辑计划独立功能遗留，生成结果数由generation_tasks承载
- net: -6行 + 1 migration

alembic/versions/048_cleanup_editplan_redundant_fields.py

@@ -0,0 +1,37 @@
+"""Phase 3 - 清理 EditPlan 表冗余字段
+
+Revision ID: 048
+Revises: 047
+Create Date: 2026-07-21
+
+Changes:
+1. 删除 edit_plans.result_count 字段（剪辑计划独立功能遗留，模板草稿不用，
+   生成结果数由 generation_tasks.result_count 承载）
+"""
+
+import sqlalchemy as sa
+
+from alembic import op
+
+revision = "048_cleanup_editplan_redundant_fields"
+down_revision = "047_template_versioning"
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    # 删除 result_count 字段（剪辑计划独立功能遗留字段）
+    op.drop_column("edit_plans", "result_count")
+
+
+def downgrade() -> None:
+    # 回滚：恢复 result_count 字段，默认值 0
+    op.add_column(
+        "edit_plans",
+        sa.Column(
+            "result_count",
+            sa.Integer,
+            nullable=False,
+            server_default="0",
+        ),
+    )

apps/worker/worker_app/tasks/edit_plan_generation.py

@@ -142,8 +142,6 @@ def _finalize_render_success(
     plan.config["rendered_storage_key"] = storage_key
     if hasattr(plan, "total_duration") and duration > 0:
         plan.total_duration = duration
-    if hasattr(plan, "result_count"):
-        plan.result_count = 1
     plan.mark_completed()
     plan_repo.update(plan)
 

packages/adapters/sqlalchemy_impl/edit_plan_repository.py

@@ -100,7 +100,6 @@ class SQLAlchemyEditPlanRepository:
             name=plan.name,
             status=plan.status,
             total_duration=plan.total_duration,
-            result_count=plan.result_count,
             source_edit_plan_id=plan.source_edit_plan_id or None,
             project_id=plan.project_id or "",
             created_by_user_id=plan.created_by_user_id or "",
@@ -120,7 +119,6 @@ class SQLAlchemyEditPlanRepository:
         model.name = plan.name
         model.status = plan.status
         model.total_duration = plan.total_duration
-        model.result_count = plan.result_count
         model.source_edit_plan_id = plan.source_edit_plan_id or None
         model.project_id = plan.project_id or ""
         model.created_by_user_id = plan.created_by_user_id or ""
@@ -154,7 +152,6 @@ class SQLAlchemyEditPlanRepository:
             name=model.name,
             status=EditPlanStatus(model.status) if model.status else EditPlanStatus.DRAFT,
             total_duration=model.total_duration or 0.0,
-            result_count=int(model.result_count or 0),
             source_edit_plan_id=model.source_edit_plan_id or "",
             project_id=model.project_id or "",
             created_by_user_id=model.created_by_user_id or "",

packages/adapters/sqlalchemy_impl/models.py

@@ -172,7 +172,6 @@ class EditPlanModel(Base):
     name = Column(String(200), nullable=False)
     status = Column(String(20), nullable=False, default="draft", index=True)
     total_duration = Column(Float, nullable=False, default=0.0)
-    result_count = Column(Integer, nullable=False, default=0)
     config = Column(JSON, nullable=False, default=dict)
     source_edit_plan_id = Column(String(36), nullable=True, index=True)
     project_id = Column(String(36), nullable=False, default="", index=True)

packages/domain/edit_plan.py

@@ -42,7 +42,6 @@ class EditPlan:
     name: str
     status: EditPlanStatus = EditPlanStatus.DRAFT
     total_duration: float = 0.0
-    result_count: int = 0
     source_edit_plan_id: str = ""
     project_id: str = ""
     created_by_user_id: str = ""
@@ -58,7 +57,6 @@ class EditPlan:
         *,
         config: dict[str, Any] | None = None,
         total_duration: float = 0.0,
-        result_count: int = 0,
         source_edit_plan_id: str = "",
         project_id: str = "",
         created_by_user_id: str = "",
@@ -75,7 +73,6 @@ class EditPlan:
             name=clean_name,
             status=EditPlanStatus.DRAFT,
             total_duration=total_duration,
-            result_count=result_count,
             source_edit_plan_id=source_edit_plan_id.strip(),
             project_id=project_id.strip(),
             created_by_user_id=created_by_user_id.strip(),