Year, season, and event are included but I'd also like to see the source of the gear as well, e.g. Iron Banner, Eververse. Currently you can filter through items with the 'source:' filter in the app itself, but I'd like to see that extended to the spreadsheets as well.
Source would be exported as a hash, not something readable...
That works too
Worth doing the conversion if possible though? https://github.com/DestinyItemManager/DIM/blob/acb8c0cc37e57bb6db467ab22fa46605984fa964/src/app/search/search-filters.ts#L469
I know where it is, that is my section of code... I do not want to maintain this list in multiple locations...
We could invert that map in code at the point of generating the spreadsheet to provide readable labels. I was hoping this was a PR and not an issue though ;-)

this is preliminarily implemented, but involves relocating D2Sources from search/search-filters to inventory/d2-source-info
does this sound reasonable?
@sundevour you should exclude raid as a source, and show the correct raid source, Bladesmith's Memory Vest comes from Scourge, which it should have as a source as well