add getUserObjFromUsername util function,

update all backends to use userObj,
add user backend manager wrapper which calls all linked backends dealing with user data,
list backend handlers for each realm

src/backends/localdb.js

@@ -53,14 +53,19 @@ export default class LocalDB extends DB_BACKEND {
 	}
 
 	setUser (user, attributes, params = null) {
-		const username = `${user.id}@${user.realm}`;
-		if (this.#data.users[username]) {
-			this.#data.users[username] = attributes;
-			this.#save();
-			return true;
+		if (attributes.resources && attributes.cluster && attributes.templates) { // localdb should only deal with these attributes
+			const username = `${user.id}@${user.realm}`;
+			if (this.#data.users[username]) {
+				this.#data.users[username] = attributes;
+				this.#save();
+				return true;
+			}
+			else {
+				return false;
+			}
 		}
-		else {
-			return false;
+		else { // if request is not setting these attributes, then assume its fine but do nothing
+			return true;
 		}
 	}