Add ability to delete configurations

apps/api/src/services/standards.ts

@@ -61,6 +61,18 @@ class StandardsConfigService {
             .execute();
         if (result[0]?.numUpdatedRows === 0n) throw new Error(`No config with id "${id}"`);
     }
+
+    async delete(id: string) {
+        const { count } = await db.selectFrom("standards_configs")
+            .select(db.fn.countAll<number>().as("count"))
+            .executeTakeFirstOrThrow();
+        if (Number(count) <= 1) throw new Error("Cannot delete the last remaining standards configuration");
+
+        const result = await db.deleteFrom("standards_configs")
+            .where("id", "=", id)
+            .execute();
+        if (result[0]?.numDeletedRows === 0n) throw new Error(`No config with id "${id}"`);
+    }
 }
 
 class StandardsDatasetService {