switch mentions from _inbox tags to mentions relation

cmd/inbox.go

@@ -17,7 +17,16 @@ var inboxCmd = &cobra.Command{
 			fmt.Fprintln(os.Stderr, err)
 			return
 		}
-		if nodes, err := d.ListNodes(db.ListFilter{TagPrefixes: []string{"_inbox::" + db.GetCurrentUser()}}); err == nil {
+		userID, err := d.GetUserByUsername(db.GetCurrentUser())
+		if err != nil {
+			fmt.Fprintln(os.Stderr, err)
+			return
+		}
+		if userID == "" {
+			output.PrintNodes(cmd.OutOrStdout(), nil, jsonFlag)
+			return
+		}
+		if nodes, err := d.ListNodes(db.ListFilter{MentionsUser: userID}); err == nil {
 			output.PrintNodes(cmd.OutOrStdout(), nodes, jsonFlag)
 		}
 	},