Summary:
Ref T1812. I think integer constants are going to be confusing and error prone for users to interact with. For example, because we use 0-5, adding a second "open" status like "needs verification" without disrupting the existing statuses would require users to define a status with, e.g., constant `6`, but order it between constants `0` and `1`. And if they later remove statuses, they need to avoid reusing existing constants.
Instead, use more manageable string constants like "open", "resolved", etc.
We must migrate three tables:
- The task table itself, to update task status.
- The transaction table, to update historic status changes.
- The saved query table, to update saved queries which specify status sets.
Test Plan:
- Saved a query with complicated status filters.
- Ran migrations.
- Looked at the query, at existing tasks, and at task transactions.
- Forced migrations to run again to verify idempotentcy/safety.
Reviewers: btrahan
Reviewed By: btrahan
Subscribers: epriestley
Maniphest Tasks: T1812
Differential Revision: https://secure.phabricator.com/D8583
