refactor: simplify code - extract constants, reduce complexity

backend/src/v1/schedule_items/router.py

@@ -38,17 +38,7 @@ async def list_schedule_items(
 ) -> list[ScheduleItemListItem]:
     request = ScheduleItemListRequest(start_at=start_at, end_at=end_at)
     items = await service.list_by_date_range(request)
-    return [
-        ScheduleItemListItem(
-            id=item.id,
-            title=item.title,
-            start_at=item.start_at,
-            end_at=item.end_at,
-            timezone=item.timezone,
-            status=item.status,
-        )
-        for item in items
-    ]
+    return [ScheduleItemListItem.model_validate(item) for item in items]
 
 
 @router.get("/{item_id}", response_model=ScheduleItemResponse)

backend/src/v1/schedule_items/schemas.py

@@ -98,6 +98,12 @@ class ScheduleItemListRequest(BaseModel):
     end_at: datetime
 
 
+# Permission bit constants (matching PermissionBits in inbox_messages/schemas.py)
+_PERMISSION_VIEW = 1  # 001
+_PERMISSION_INVITE = 2  # 010
+_PERMISSION_EDIT = 4  # 100
+
+
 class ScheduleItemShareRequest(BaseModel):
     model_config: ClassVar[ConfigDict] = ConfigDict(extra="forbid")
 
@@ -109,11 +115,11 @@ class ScheduleItemShareRequest(BaseModel):
     def _permission_value(self) -> int:
         value = 0
         if self.permission_view:
-            value |= 1
+            value |= _PERMISSION_VIEW
         if self.permission_edit:
-            value |= 4
+            value |= _PERMISSION_EDIT
         if self.permission_invite:
-            value |= 2
+            value |= _PERMISSION_INVITE
         return value
 
 

backend/src/v1/schedule_items/service.py

@@ -112,26 +112,16 @@ class ScheduleItemService(BaseService):
             if existing is None:
                 raise HTTPException(status_code=404, detail="Schedule item not found")
 
-            update_data: dict = {}
-            if request.title is not None:
-                update_data["title"] = request.title
-            if request.description is not None:
-                update_data["description"] = request.description
-            if request.start_at is not None:
-                update_data["start_at"] = request.start_at
-            if request.end_at is not None:
-                update_data["end_at"] = request.end_at
-            if request.timezone is not None:
-                update_data["timezone"] = request.timezone
-            if request.status is not None:
-                update_data["status"] = request.status
-            if request.metadata is not None:
-                update_data["metadata"] = request.metadata.model_dump()
+            # Build update dict from non-null fields
+            update_data = request.model_dump(exclude_unset=True)
 
-            next_start = (
-                request.start_at if request.start_at is not None else existing.start_at
-            )
-            next_end = request.end_at if request.end_at is not None else existing.end_at
+            # Handle metadata separately (model_dump returns dict)
+            if "metadata" in update_data and update_data["metadata"] is not None:
+                update_data["metadata"] = update_data["metadata"].model_dump()
+
+            # Validate time range
+            next_start = update_data.get("start_at", existing.start_at)
+            next_end = update_data.get("end_at", existing.end_at)
             if next_end is not None and next_end <= next_start:
                 raise HTTPException(
                     status_code=400, detail="end_at must be after start_at"