Fix up the Exec function so it returns the result. That lets me get the ID of last insert.

api/handlers.go

@@ -34,7 +34,7 @@ func PostApiRegister(c *fiber.Ctx) error {
     Columns("username", "email", "password").
     Values(user.Username, user.Email, user.Password).ToSql()
 
-  err = data.Exec(err, sql, args...)
+  _, err = data.Exec(err, sql, args...)
   if err != nil { return IfErrNil(err, c) }
 
   return c.Redirect("/login/")