Ref T1191. Three parts:
- The old way of getting key information only got primary / unique / foreign keys, not all keys. Use SHOW INDEXES to get all keys instead.
- Track key uniqueness and raise warnings about it.
- Add a new "all issues" view to show an expanded, flat view of all issues. This is just an easier way to get a list so you don't have to dig around in the hierarchical view.