Restore the small database from attached backup and run the following script on it:

alter table cms_wiki
add u_name varchar(100) character set UTF8,
add u_title varchar(100) character set UTF8,
add u_description blob sub_type 1 character set UTF8,
add u_text blob sub_type 1 character set UTF8;

commit;

update cms_wiki set
u_name = name, u_title = title, u_text = text, u_description = description;
  
commit;

drop index uq_cms_wiki;

alter table cms_wiki drop name, drop description, drop text, drop title;

commit;

alter table cms_wiki
alter u_name to name,
alter u_title to title,
alter u_description to description,
alter u_text to text;

commit;

CREATE UNIQUE INDEX UQ_CMS_WIKI ON CMS_WIKI (NAME, SITE_ID);