Avatar fields (picture vs uploadedpicture)

[alff0x1f]

Hi! I install nodebb3 and now I want import data from my old phpbb3 forum. Topics, posts, private messages import almost fine. I work now with such missing data like avatars, attachments and passwords.

My question about avatars. Now I writing small script for import avatars.
I look in mongodb and in object "user:1" I found 2 different fields. "picture" and "uploadedpicture". Can anybody explain difference between this two fields? (if set url value in "picture" it is also work, but why 2 fields?)

> db.objects.find( {"_key":"user:1"} )
{ "_id" : ObjectId("57cd985672787e570dde8859"), 
"_key" : "user:1", 
"username" : "admin", 
"picture" : "/uploads/profile/1-profileimg.jpg", 
 ...
"uploadedpicture" : "/uploads/profile/1-profileimg.jpg", 
 ... }

PS may be exist some documentation about nodebb Database structure?

[yariplus]

uploadedpicture is their most recently uploaded profile picture.

picture is their currently selected picture.