It is used by ContentTranslation to store things like
{"from":"es","to":"en"}
Change-Id: I880ecc74ab46dde2fa00ddb7baea08edeabcf676
ct_rev_id int unsigned NULL,
-- Tag applied
ct_tag varchar(255) NOT NULL,
ct_rev_id int unsigned NULL,
-- Tag applied
ct_tag varchar(255) NOT NULL,
- -- Parameters for the tag, presently unused
+ -- Parameters for the tag; used by some extensions
ct_params blob NULL
) /*$wgDBTableOptions*/;
ct_params blob NULL
) /*$wgDBTableOptions*/;