Auto-removal of irrelevant notes

[Mike Dewhirst]

The software re-categorises on every save and simultaneously creates the AICIS information notes if they don't already exist.

This means as the Category/bands/items change in response to added or adjusted data - eg varying volumes or perhaps an adjustment to polymer properties, some or all AICIS information notes from previous saves will become irrelevant.

The workaround is to manually delete all AICIS information notes (except for those which have been edited) prior to saving again so only the correct notes get created.

The software should manage that process automatically but MUST NOT remove notes which have been edited in any way by a human.

[Mike Dewhirst]

The MUST NOT remove edited notes requirement calls for an additional hidden field within which to keep a "flag" to prove the note or title has not been altered.

We will hash those two fields in a repeatable way as that flag and compare the current hash value with the flag if we find it necessary to delete out-of-date notes. If it is identical we can delete the note without remorse. Otherwise, the user has edited the note and we cannot delete it automatically. However, in that case we should add " - Out-of-date" to the title!

[Mike Dewhirst]

Deployed the change in 0.9.69. Irrelevant notes as well as useful links are deleted. If such a note has been edited it gets "No longer relevant" appended to the title.