Move nostr pubkeys to LDAP attribute

closes #173

app/models/user.rb

@@ -50,8 +50,6 @@ class User < ApplicationRecord
   validates_length_of :display_name, minimum: 3, maximum: 35, allow_blank: true,
                                      if: -> { defined?(@display_name) }
 
-  validates_uniqueness_of :nostr_pubkey, allow_blank: true
-
   validate :acceptable_avatar
 
   #
@@ -163,6 +161,15 @@ class User < ApplicationRecord
     @display_name ||= ldap_entry[:display_name]
   end
 
+  def nostr_pubkey
+    @nostr_pubkey ||= ldap_entry[:nostr_key]
+  end
+
+  def nostr_pubkey_bech32
+    return nil unless nostr_pubkey.present?
+    Nostr::PublicKey.new(nostr_pubkey).to_bech32
+  end
+
   def avatar
     @avatar_base64 ||= LdapManager::FetchAvatar.call(cn: cn)
   end
@@ -189,11 +196,6 @@ class User < ApplicationRecord
     ldap.delete_attribute(dn,:service)
   end
 
-  def nostr_pubkey_bech32
-    return nil unless nostr_pubkey.present?
-    Nostr::PublicKey.new(nostr_pubkey).to_bech32
-  end
-
   private
 
     def ldap