write query profile

UI/templates/adduser.html

@@ -25,7 +25,7 @@
             {{ form.hidden_tag() }}
             <div class="form-group">
                 <label for="username">Username</label>
-                <input type="text" class="form-control" id="username" name="username" placeholder="Enter username" pattern="^[a-zA-Z][a-zA-Z0-9_]{0,19}$" required>
+                <input type="text" class="form-control" id="username" name="username" placeholder="Enter username" maxlength="20" pattern="^[a-zA-Z][a-zA-Z0-9_]{0,19}$" required>
                 <div class="invalid-feedback">
                     Username must start with a letter and can only contain letters, numbers, and underscores (max 20 characters).
                 </div>