Add supplier CRUD on entity with Lieferanten group and entityhistory

src/store/supplier/ensureLieferantenGroup.js

@@ -0,0 +1,26 @@
+import {
+  CREATE,
+  GET_BY_COMPANY_AND_NAME,
+} from '../../sql/customergroup.js';
+import { SUPPLIER_GROUP_NAME } from '../../sql/entity.js';
+
+/** Ensure company has customergroup "Lieferanten"; return its id. */
+export default async function ensureLieferantenGroup(pool, companyId, tx) {
+  const req = () => (tx ?? pool).request();
+
+  const existing = await req()
+    .input('companyId', companyId)
+    .input('name', SUPPLIER_GROUP_NAME)
+    .query(GET_BY_COMPANY_AND_NAME);
+
+  if (existing.recordset[0]) {
+    return existing.recordset[0].id;
+  }
+
+  const created = await req()
+    .input('companyId', companyId)
+    .input('name', SUPPLIER_GROUP_NAME)
+    .query(CREATE);
+
+  return created.recordset[0].id;
+}