diff --git a/.gitignore b/.gitignore
index 7f4adb8..e14b93f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -38,4 +38,4 @@ next-env.d.ts
 # vscode
 .vscode
 
-database.db
\ No newline at end of file
+/database.db
\ No newline at end of file
diff --git a/database.db b/database.db
deleted file mode 100644
index 8f668b0..0000000
Binary files a/database.db and /dev/null differ
diff --git a/src/pages/api/user/[userId]/inventory-items.ts b/src/pages/api/user/[userId]/inventory-items.ts
index d693f63..4dcc3f3 100644
--- a/src/pages/api/user/[userId]/inventory-items.ts
+++ b/src/pages/api/user/[userId]/inventory-items.ts
@@ -50,9 +50,8 @@ export default async function handler(
       const { itemId } = req.body;
       const db = await dbConnection;
 
-      const invSql = "SELECT id,tier,store_item_id FROM inventory_item WHERE id = ? AND user_id = ?";
-      
-      const invItem = await db.get(invSql, [itemId, userId]);
+      const invItem = await db.get(`SELECT id,tier,store_item_id FROM inventory_item
+                                    WHERE id = ? AND user_id = ?`, [itemId, userId]);
 
       const storeItem = gameConfig.store.find((item) => item.id == invItem.store_item_id);
       if (storeItem == undefined) {
@@ -71,8 +70,7 @@ export default async function handler(
         await db.run("BEGIN");
         await db.run(`UPDATE bank_account SET balance = balance - ?
                       WHERE user_id = ?`, [upgradePrice, userId]);
-        await db.run(`UPDATE inventory_item SET tier = tier + 1
-                      WHERE user_id = ? AND store_item_id = ?;`, [userId, itemId]);
+        await db.run(`UPDATE inventory_item SET tier = tier + 1 WHERE id = ?`, [itemId]);
         await db.run("INSERT INTO upgrade_event(inventory_item_id) VALUES ( ? )", [invItem.store_item_id]);
         await db.run("COMMIT");
       } catch (error) {
diff --git a/test-endpoints.rest b/test-endpoints.restclient
similarity index 95%
rename from test-endpoints.rest
rename to test-endpoints.restclient
index 66b1d1c..dc7a390 100644
--- a/test-endpoints.rest
+++ b/test-endpoints.restclient
@@ -35,7 +35,7 @@ POST http://localhost:3000/api/user/1/inventory-items/
 # Upgrade an owned item
 PUT http://localhost:3000/api/user/1/inventory-items/
 :headers
-{ "itemId" : "item1" }
+{ "itemId" : 1 }
 
 # Get stakes
 GET http://localhost:3000/api/user/1/stakes/