Merge pull request #55317 from nextcloud/fix/dav/user-addressbook-clean-up-stable31

apps/dav/lib/CardDAV/CardDavBackend.php

@@ -1091,6 +1091,13 @@ class CardDavBackend implements BackendInterface, SyncSupport {
 		}, $this->db);
 	}
 
+	/**
+	 * Delete all of a user's shares
+	 */
+	public function deleteAllSharesByUser(string $principaluri): void {
+		$this->sharingBackend->deleteAllSharesByUser($principaluri);
+	}
+
 	/**
 	 * Search contacts in a specific address-book
 	 *

apps/dav/lib/HookManager.php

@@ -102,6 +102,7 @@ class HookManager {
 			);
 		}
 		$this->calDav->deleteAllSharesByUser('principals/users/' . $uid);
+		$this->cardDav->deleteAllSharesByUser('principals/users/' . $uid);
 
 		foreach ($this->addressBooksToDelete as $addressBook) {
 			$this->cardDav->deleteAddressBook($addressBook['id']);