Clojurians Log v2

My problems are that I don't know enough Datomic to figure out how to have "a value index". I'm studying the documentation on schema change at https://docs.datomic.com/cloud/schema/schema-change.html There are two pre-conditions:In order to add a uniqueness constraint to an attribute, both of the following must be true: > The attribute must have a cardinality of `:db.cardinality/one`. > If there are values present for that attribute, they must be unique in the set of current database assertions. For the first one, my schema for :user/email already has :db.cardinality/one. For the second one, I don't know how to handle: 1. how to check if the values present for :user/email are unique or not 2. If not, how to fix them.

Hello, I'm discovering Datomic entity specs. I tried to trigger an spec error and here is the message:

"Entity temp-id missing attributes clojure.lang.LazySeq@e65620e6 of spec :admin/validate"

"Entity 42 missing attributes [:user/email] of by :user/validate"}

Also I noted those points that seem weird: 1 - The documentation says: :db/ensure is a virtual attribute. It is not added in the database; instead it triggers checkes based on the named entity. When I then pull all the attributes of the entity, the :db/ensure field appears.

{:db/id 17592186045425,
 :db/ensure [#:db{:id 17592186045420}],
 :user/hashed-password "...",
 ...}

(datomic.api/transact
  conn*
  [[:db/retract 17592186045425 :user/hashed_password]])

does Datomic use auto-discovery when integrating with the managed memcached in AWS? Or do we need to pass in each relevant memcached node individually?

can you share your :admin/validate spec ?