Apply parts of T310423 to wmf wikis
The patch drops the `default ''`, the type change from `char(14) binary` to `binary(14)` should not have impact on production, feel free to improve the ALTER for production need.
# **ALTERs to run:** https://gerrit.wikimedia.org/r/c/mediawiki/extensions/LiquidThreads/+/804738/3/sql/mysql/patch-thread-timestamps.sql
# **Where to run those changes:** According to the config only on (please verifiy, I am not sure if on x1 or on s1-s8)
#- enwikinews
#- enwiktionary
#- fiwikimedia
#- huwiki
#- mediawikiwiki
#- officewiki
#- ptwikibooks
#- sewikimedia
#- strategywiki
#- svwikisource
#- test2wiki
#- testwiki
#- wikimania2010wiki
# **When to run those changes:** any time
# **If the schema change is backwards compatible:** Yes
# **If the schema change has been tested already on some of the test/beta wikis:** not running on beta
# **if the data should be made available on the labs replicas and/or dumps:** no change of the existing rules
Progress
[x] s2
[] s3
[] s6
[x] s7