Issue #3381019: Ensure primary key gets added upon update.

acquia_dam.post_update.php

@@ -9,6 +9,7 @@ declare(strict_types=1);
 
 use Drupal\acquia_dam\Entity\MediaSourceField;
 use Drupal\acquia_dam\Plugin\Field\FieldType\AssetItem;
+use Drupal\Core\Database\Database;
 
 /**
  * Populate the external_id field.
@@ -70,3 +71,13 @@ function acquia_dam_post_update_existing_media_external_id_field(&$sandbox) {
 function acquia_dam_post_update_add_crop_new_asset_version_subscriber(&$sandbox) {
   // Empty post_update hook to rebuild service container.
 }
+
+/**
+ * Implements hook_post_update_NAME().
+ */
+function acquia_dam_post_update_link_tracking_primary_key(&$sandbox) {
+  $schema = Database::getConnection()->schema();
+  if (!$schema->indexExists('acquia_dam_integration_link_tracking', 'PRIMARY')) {
+    $schema->addPrimaryKey('acquia_dam_integration_link_tracking', ['entity_uuid']);
+  }
+}