Add an attribute to cards that logs the dates they move between different stacks

Hello Nextcloud Deck Team,

I'm an avid user of the Deck feature, particularly its Kanban-style boards (ToDo, InProgress, In Review, Completed). I've noticed a potential area for enhancement that could significantly improve task management and tracking efficiency.

Feature Request:
I'm creating a Gantt chart view using the Deck API to visualize the duration it takes to complete tasks. This would be particularly beneficial for understanding the time spent on each task. Currently, while the Kanban boards provide an excellent overview of task status, they lack the ability to track and display the duration each task takes from start to completion.

Implementation Idea:
The Gantt chart could utilize data from the 'Completed' stack to indicate when a task is finished. However, for this to be truly effective, it would also need to track when a task moves from 'ToDo' to 'InProgress' (signifying the start of the task) and from 'In Review' to 'Completed' (signifying task completion). This would offer a comprehensive view of the task lifecycle.

One potential way to achieve this could be by adding an attribute to cards that logs the dates they move between different stacks. This data can then be used to populate the Gantt chart.

I believe this feature could greatly enhance the functionality of Deck, making it an even more powerful tool for project management. I would appreciate your consideration of this feature request and am eager to hear your thoughts on its feasibility.

Thank you for your continuous efforts in improving Nextcloud Deck.

Best regards,
Ernesto

Start by reviewing the Deck API's card and stack behavior, focusing on how movements between stacks are represented. Define what transition dates cards should expose and verify that the resulting data supports tracking a card from ToDo through completion for Gantt chart use.