fix: properly clean up product uploads

crates/core/src/database/products.rs

@@ -250,6 +250,15 @@ If your product is a purchase of goods or services, please be sure to fulfill th
             return Err(Error::NotAllowed);
         }
 
+        // remove uploads
+        for upload in product.uploads.thumbnails {
+            self.delete_upload(upload).await?;
+        }
+
+        if product.uploads.reward != 0 {
+            self.delete_upload(product.uploads.reward).await?;
+        }
+
         // ...
         let conn = match self.0.connect().await {
             Ok(c) => c,