I am using TT-RSS with MySQL with TokuDB engine instead of InnoDB engine. But TT-RSS does not allow this in his sanity check (Link to source /include/sanity_check.php#L34) . So I changed that hard coded now in:
table_schema = ? AND table_name LIKE 'ttrss_%' AND engine NOT IN ('InnoDB','TokuDB')");
Which works fine for me.
I use TokuDB now for years as a drop in replacement for InnoDB. Link to TokuDB Wiki (which I am not allowed to post). This saves about 10 times on disk while speeding up 4 times compared to InooDB.
So it would be nice that we could have a setting where we have a list of supported engines? Maybe there are more engines supported that you do not know.
I am happy to make a PR for it.