diff --git a/README.md b/README.md
index c12d723..dc96418 100644
--- a/README.md
+++ b/README.md
@@ -117,7 +117,7 @@ Backend mapping:
 | --- | --- | --- |
 | `create` | `({ parentId, sort })` | `id` |
 | `updateParentId` | `(id, parentId)` | `void` |
-| `delete` | `(id)` | `void` |
+| `delete` | `(id)` | `void` — blocked by FK if `categoryarticle` (or child categories) still reference it |
 | `getTree` | `(rootId)` | `{ id, parentId, sort }[]` |
 
 ---
diff --git a/src/schema.js b/src/schema.js
index b18d91d..0815bdd 100644
--- a/src/schema.js
+++ b/src/schema.js
@@ -332,7 +332,7 @@ BEGIN
         id INT IDENTITY(1,1) PRIMARY KEY,
         category_id INT NOT NULL,
         article_id INT NOT NULL,
-        CONSTRAINT FK_categoryarticle_category FOREIGN KEY (category_id) REFERENCES category(id) ON DELETE CASCADE,
+        CONSTRAINT FK_categoryarticle_category FOREIGN KEY (category_id) REFERENCES category(id) ON DELETE NO ACTION,
         CONSTRAINT FK_categoryarticle_article FOREIGN KEY (article_id) REFERENCES article(id) ON DELETE CASCADE,
         CONSTRAINT UQ_categoryarticle_category_article UNIQUE (category_id, article_id)
     );
diff --git a/src/sql/company.js b/src/sql/company.js
index 84064e0..3f4f13b 100644
--- a/src/sql/company.js
+++ b/src/sql/company.js
@@ -46,11 +46,14 @@ SELECT
     c.name,
     c.root_category_id AS rootCategoryId,
     c.default_language_id AS languageId,
-    c.taxrate,
-    c.reducedtaxrate,
-    c.taxfreerate
+    tr.rate AS taxrate,
+    rtr.rate AS reducedtaxrate,
+    tfr.rate AS taxfreerate
 FROM company c
 INNER JOIN companyuser cu ON cu.company_id = c.id
+LEFT JOIN tax tr ON tr.id = c.taxrate
+LEFT JOIN tax rtr ON rtr.id = c.reducedtaxrate
+LEFT JOIN tax tfr ON tfr.id = c.taxfreerate
 WHERE cu.google_auth_id = @authId
 `;
 
diff --git a/src/store/category/delete.js b/src/store/category/delete.js
index a33c788..7a48ec9 100644
--- a/src/store/category/delete.js
+++ b/src/store/category/delete.js
@@ -2,9 +2,6 @@ import { DELETE } from '../../sql/category.js';
 
 export default function del(pool) {
   return async (id) => {
-    await pool
-      .request()
-      .input('id', id)
-      .query(DELETE);
+    await pool.request().input('id', id).query(DELETE);
   };
 }