Reaction in old addon

The Link Directory has still Likes instead of Reactions.
So i try to change that.
I have chanded/added the thread rection fields to the table.
I have copied all methods from RM resourceitem and resourceupdate; checked everything twice.
I have tried to add the template code.
I have added content_type

But

I still have no reactions on the page.
Are there aby docs for reactions, please?

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source https://xfworld.net/threads/reaction-in-old-addon.47867/