Manually adding a new block type

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Hi

I had a block installed, but the database with it installed was lost.

So I have taken a backup of the database and added the BlockType data back into the database. But the new btID is 49 and this is not appearing in the array of allowed block types in the file elements/block_area_add_new.php

Where is the list of allowed btIDs stored?

Thanks

yolk