You can define functions inside the database and then use them inside a transaction [1] so that you can get atomic update, if that's the question. You can also

You can define functions inside the database and then use them inside a transaction [1] so that you can get atomic update, if that's the question. You can also mark attributes as noHistory [2] if you don't care about the past state. [1] http://docs.datomic.com/database-functions.html http://docs.datomic.com/database-functions.html [2] http://docs.datomic.com/schema.html http://docs.datomic.com/schema.html