Feature Request: obtainable flag for items

[Cypheriel]

Is your feature request related to a problem? Please describe.
Currently, it does not seem possible to tell which items are actually obtainable. An example of this being "Primed" Ammo Drum — it may exist internally, but it is completely unobtainable currently and displaying it for my own purposes would not be wise.

Describe the solution you'd like
I would like to see an obtainable flag on items, in order to distinguish which items can actually be obtained.

Describe alternatives you've considered
Currently, all I can think of is lazily parsing the "uniqueName" of items and trying to figure out which items don't exist based on that. However, this does not feel like an ideal solution in the slightest.

Additional context
https://api.warframestat.us/items/search/Ammo%20Drum/