does not work with different entities of different entity types that have the same entity id

There is an issue with this module if the same entity id for different entity types is counted.

If for example there is node id 2 and user id 2 and both are counted, then the node counter will overwrite the user counter and vice versa.

This is because the merge query to write the counter is not correct and the schema for entity counter is not correct too.

I am providing a patch for this.