feat: Add deletion of associated tasks when deleting a project

src/backend/app/projects/project_routes.py

@@ -22,6 +22,40 @@
 )
 
 
+@router.delete('/projects/{project_id}', tags=["Projects"])
+def delete_project_by_id(
+    project_id: int,
+    db: Session = Depends(database.get_db)
+):
+    """
+    Delete a project by its ID, along with all associated tasks.
+
+    Args:
+        project_id (int): The ID of the project to delete.
+        db (Session): The database session dependency.
+
+    Returns:
+        dict: A confirmation message.
+
+    Raises:
+        HTTPException: If the project is not found.
+    """
+    # Query for the project
+    project = db.query(db_models.DbProject).filter(db_models.DbProject.id == project_id).first()
+    if not project:
+        raise HTTPException(status_code=404, detail="Project not found.")
+
+    # Query and delete associated tasks
+    tasks = db.query(db_models.DbTask).filter(db_models.DbTask.project_id == project_id).all()
+    for task in tasks:
+        db.delete(task)
+
+    # Delete the project
+    db.delete(project)
+    db.commit()
+    return {"message": f"Project ID: {project_id} is deleted successfully."}
+
+
 @router.post(
     "/create_project", tags=["Projects"], response_model=project_schemas.ProjectOut
 )