Is it possible to determine who made a post closed or community wiki and why from the Stack Overflow data dump?
You can find that record in the PostHistory table by looking for rows with PostHistoryTypeId = 16
That row will have the UserId populated.
- When the UserId = -1 the post was made Community Wiki by the system.
- If the UserId == Posts.OwnerUserId the OP made the Post community wiki
- If the UserId != Posts.OwnerUserId either a moderator converted the post to Community Wiki or the question received its 30th answer (in which case the UserId is that of the answers OwnerUserId)
Here is a SEDE Query to verify.
For closed questions you'll be looking at PostHistoryTypeId=10 where the
text column will have the JSON with all the close voters. The
UserId column will have the last close voter.