And that is that! Target number support is in.

inventory/templates/settings.html

@@ -175,6 +175,42 @@ dtlist.style.height = height;
 dtlist.style.maxHeight = height;
 dtlist.style.minHeight = height;
 
+document.querySelectorAll('.dt-target').forEach((el) => {
+  el.addEventListener('change', async (ev) => {
+    const num = ev.target.value;
+    const id = ev.target.parentElement.dataset.invId;
+
+    let res, data;
+    try {
+      const res = await fetch(`{{ url_for('crudkit.devicetype.rest_list') }}${id}`, {
+        method: 'PATCH',
+        headers: {
+          'Content-Type': 'application/json',
+          'Accept': 'application/json'
+        },
+        credentials: 'same-origin',
+        body: JSON.stringify({target: num})
+      });
+
+      const ct = res.headers.get('Content-Type') || '';
+      if (ct.includes('application/json')) {
+        data = await res.json();
+      }
+
+      if (res.status !== 200) {
+        const msg = data?.error || `Create failed (${res.status})`;
+        toastMessage(msg, 'danger');
+        return;
+      }
+    } catch (err) {
+      toastMessage('Network error setting target number', 'danger');
+      return;
+    }
+
+    toastMessage('Updated target number.', 'success');
+  });
+});
+
 document.addEventListener('click', (ev) => {
   const addButton = document.getElementById('add-devicetype');
   const editButton = document.getElementById('edit-devicetype');