feat: allow multiple auth sources per user (#500,#477) (#612)

* feat: allow multiple auth sources per user (#500,#477)

* only override isAdmin flag if it is provided by the authentication source

frontend/src/helpers/models.js

@@ -137,7 +137,7 @@ export function freshUser() {
     Identifier: "",
 
     Email: "",
-    Source: "db",
+    AuthSources: ["db"],
     IsAdmin: false,
 
     Firstname: "",
@@ -155,6 +155,8 @@ export function freshUser() {
 
     ApiEnabled: false,
 
+    PersistLocalChanges: false,
+
     PeerCount: 0,
 
     // Internal values