Add bulk complete todos endpoint for efficient batch operations

app/api/v1/todos.py

@@ -2,6 +2,7 @@ from typing import List, Optional
 
 from fastapi import APIRouter, Depends, HTTPException, status, Query
 from sqlalchemy.orm import Session
+from pydantic import BaseModel
 
 from app.crud import todo
 from app.db.session import get_db
@@ -10,6 +11,10 @@ from app.schemas.todo import TodoCreate, TodoResponse, TodoUpdate
 router = APIRouter()
 
 
+class BulkCompleteRequest(BaseModel):
+    todo_ids: List[int]
+
+
 @router.get("/", response_model=List[TodoResponse])
 def read_todos(
     skip: int = 0,
@@ -117,3 +122,36 @@ def delete_todo(
             status_code=status.HTTP_404_NOT_FOUND, detail="Todo not found"
         )
     return todo_obj
+
+
+@router.post("/bulk-complete", response_model=List[TodoResponse])
+def bulk_complete_todos(
+    *,
+    db: Session = Depends(get_db),
+    request: BulkCompleteRequest,
+):
+    """
+    Mark multiple todos as completed.
+    """
+    completed_todos = []
+    not_found_ids = []
+    
+    for todo_id in request.todo_ids:
+        todo_obj = todo.get(db=db, todo_id=todo_id)
+        if todo_obj:
+            updated_todo = todo.update(
+                db=db, 
+                db_obj=todo_obj, 
+                obj_in={"completed": True}
+            )
+            completed_todos.append(updated_todo)
+        else:
+            not_found_ids.append(todo_id)
+    
+    if not_found_ids:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail=f"Todos not found: {not_found_ids}"
+        )
+    
+    return completed_todos