This bug regards Mediawiki history dumps (TSV)

Steps to Reproduce:

1. From this page download the 2014 dump.

2. Extract the downloaded file

3. Open it with whatever you want and search for "merge"

Actual Results:

You will have an event_type "merge", they should be three for the 2014 year, but they are present also in other years of the Italian version (in total 209 tuples).

Expected Results:

There should be no tuple with "event_type" of value "merge", because it is not in the documentation.