Edit: you can find the id of the files in the various dbc, then check with files.dbc to see the file patch. File ID's can be hexadecimal in other dbc but not in files.dbc.
I don't know where the "models" would be stored but check for auras in other spell DBCs as that is what makes the wings appear.
I recently added full documentation on all dbcs at the state of WoD beta. Likely the ones you modify did not change since. Please check the wiki before making claims.
http://www.wowdev.wiki/index.php?title=SpellVisualEffectName.dbc likely is close. Also, be sure to document it, when you find out.
Have you tried finding stuff out yourself instead if just complaining about missing documentation? From what you wrote, the only changed thing is stringref → some table ref. that sounds pretty documented to me. So instead of whining that it isn't difumented, say that everything is there except for that column.I don't know if you realize it, but I and others have put days of work into that wiki, so just hearing that something would be completely missing while it is only one column is really annoying and makes me feel bad. I don't like that feeling. I'd rather enjoy you not being an ass but trying to contribute, for example by adding a new, 6.* entry for that file and leaving that column as unknown. Likely that will take less than a day to get attention and someone may even fix it.