Richer task model with ownership, deadlines, and importance grade

Added

• Due date for each task to make deadlines explicit and visible.
• Importance grade to prioritize what matters most in each board or project.
• Owner field so every task has a clear person responsible for driving it to completion.
• Unlimited custom tags to categorize and group tasks flexibly (e.g. feature, bug, client, area).
• Change history for due dates to track how and when deadlines evolve over time.

Behavior

• Tasks are no longer just “done” or “not done”: they now carry context about when they should be completed, how important they are, who owns them, and how they’re categorized.
• The due date history makes shifts in planning transparent, helping understand how work and priorities change.
• Combined with the fixed Completed column in Kanban, this provides visibility across the entire task lifecycle: from creation and prioritization to ownership, scheduling, and completion.

Benefits

• End-to-end task control: every task has enough metadata to be tracked, owned, and delivered reliably.
• Better prioritization: importance grades and due dates make it easier to decide what to tackle next.
• Clear accountability: owners remove ambiguity about who is responsible for each piece of work.
• Deeper insights: tags and due date history enable better reporting, filtering, and future analytics on how work flows through the system.