diff --git a/src/backpacks.php b/src/backpacks.php
index a58463c..1282698 100644
--- a/src/backpacks.php
+++ b/src/backpacks.php
@@ -32,6 +32,17 @@ if (isset($_POST['delete_backpack_id'])) {
     }
 }
 
+// AUTO-MIGRATION: Check columns to prevent SQL errors
+$check_col = $conn->query("SHOW COLUMNS FROM backpacks LIKE 'product_url'");
+if ($check_col && $check_col->num_rows == 0) {
+    $conn->query("ALTER TABLE backpacks ADD COLUMN product_url VARCHAR(255) DEFAULT NULL AFTER image_url");
+}
+$check_col_c = $conn->query("SHOW COLUMNS FROM backpack_compartments LIKE 'linked_article_id'");
+if ($check_col_c && $check_col_c->num_rows == 0) {
+    $conn->query("ALTER TABLE backpack_compartments ADD COLUMN linked_article_id INT DEFAULT NULL");
+    $conn->query("ALTER TABLE backpack_compartments ADD CONSTRAINT fk_bc_article FOREIGN KEY (linked_article_id) REFERENCES articles(id) ON DELETE SET NULL");
+}
+
 // Fetch Backpacks (Personal + Household)
 $household_id = null;
 $stmt_hh = $conn->prepare("SELECT household_id FROM users WHERE id = ?");
@@ -43,10 +54,6 @@ if ($row = $res_hh->fetch_assoc()) {
 }
 
 $backpacks = [];
-// AUTO-MIGRATION: Check if product_url column exists (just to be safe for display)
-// Ideally handled in edit_backpack but good to be safe.
-$check_col = $conn->query("SHOW COLUMNS FROM backpacks LIKE 'product_url'");
-$has_product_url = ($check_col && $check_col->num_rows > 0);
 
 $sql = "SELECT b.*, u.username as owner_name,
         (SELECT SUM(a.weight_grams)