if i have 2 cypher query posts to neo4j

"MERGE a:Member( {id: {member_id} })" , member_id: 5

"MERGE a:Member( {id: {member_id} })" , member_id: 5

with both of these posts occurring simultaneously, is it possible to have 2 
nodes created, instead of just the one?
that is, if the first merge was interrupted halfway though, and had not 
completed yet, the second then creates a new one since it doesnt see the 
first...
is this something that could potentially happen?

on a related note, how would i enforce uniqueness on Member(id) ?

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