fix: make discord login work if no user exists

backend/db/user.go

@@ -102,6 +102,10 @@ func (db *DB) DiscordUser(ctx context.Context, discordID string) (u User, err er
 	var id xid.ID
 	err = db.QueryRow(ctx, sql, args...).Scan(&id)
 	if err != nil {
+		if errors.Cause(err) == pgx.ErrNoRows {
+			return u, ErrUserNotFound
+		}
+
 		return u, errors.Wrap(err, "executing id query")
 	}
 

backend/server/errors.go

@@ -50,6 +50,14 @@ type APIError struct {
 }
 
 func (e APIError) Error() string {
+	if e.Message == "" {
+		e.Message = errCodeMessages[e.Code]
+	}
+
+	if e.Details != "" {
+		return fmt.Sprintf("%s (code: %d) (%s)", e.Message, e.Code, e.Details)
+	}
+
 	return fmt.Sprintf("%s (code: %d)", e.Message, e.Code)
 }