In T54932#1575467, @Krenair wrote:

devwikiinternal.old, rel13testwiki.old, zh_cnwiki.old
I'm not sure these ones should be deleted. These wikis are 'deleted' in the sense that MediaWiki no longer exposes them to users, however as far as I know the DBs are not typically deleted. These specific tables were used on very old (MW 1.4) sites.

Not sure what devwikiinternal was about, but rel13testwiki sounds as it can definitely go.

Note: Comment updated to reflect the new path for these backups (as dbstore1001 was reimaged)

So,

devwikiinternal and rel13testwiki and last write happened on 2015.
I have taken a mysqldump from those two databases and placed them at:

root@dbstore1001:/srv/backups/tmp/T118764# pwd
/srv/tmp/T118764
root@dbstore1001:/srv/backups/tmp/T118764# ls -lh
total 420K
-rw-r--r-- 1 root root 208K May  4 09:45 devwikiinternal.sql
-rw-r--r-- 1 root root 212K May  4 09:45 rel13testwiki.sql

@Reedy @MaxSem you guys fine if I go ahead and drop these two?

I'd say so. You've got a backup of the tiny amount of data they apparently hold... So if anyone needs them, we have it :)

Yeah, no way anybody needs these.

Mentioned in SAL (#wikimedia-operations) [2018-05-07T05:37:21Z] <marostegui> Unused databases devwikiinternal and rel13testwiki from s3 - T118764