i had the same issue.
made a mysql export from other server of that part
and then imported on "corrupt" server (command: mysql roundcubemail < resp.sql)
you can try my dump, but before you do:
if your iredmail is on VM (make a snapshot to revert later if something brakes)
if it's bare metal server - make a complete mysql dump
and all you do is your risk, i'm not responsible
-- MySQL dump 10.19 Distrib 10.3.38-MariaDB, for debian-linux-gnu (x86_64)
--
-- Host: localhost Database: roundcubemail
-- ------------------------------------------------------
-- Server version 10.3.38-MariaDB-0ubuntu0.20.04.1
/*!40101 SET @OLD_CHARACTER_SET_CLIENT=@@CHARACTER_SET_CLIENT */;
/*!40101 SET @OLD_CHARACTER_SET_RESULTS=@@CHARACTER_SET_RESULTS */;
/*!40101 SET @OLD_COLLATION_CONNECTION=@@COLLATION_CONNECTION */;
/*!40101 SET NAMES utf8mb4 */;
/*!40103 SET @OLD_TIME_ZONE=@@TIME_ZONE */;
/*!40103 SET TIME_ZONE='+00:00' */;
/*!40014 SET @OLD_UNIQUE_CHECKS=@@UNIQUE_CHECKS, UNIQUE_CHECKS=0 */;
/*!40014 SET @OLD_FOREIGN_KEY_CHECKS=@@FOREIGN_KEY_CHECKS, FOREIGN_KEY_CHECKS=0 */;
/*!40101 SET @OLD_SQL_MODE=@@SQL_MODE, SQL_MODE='NO_AUTO_VALUE_ON_ZERO' */;
/*!40111 SET @OLD_SQL_NOTES=@@SQL_NOTES, SQL_NOTES=0 */;
--
-- Table structure for table `responses`
--
DROP TABLE IF EXISTS `responses`;
/*!40101 SET @saved_cs_client = @@character_set_client */;
/*!40101 SET character_set_client = utf8 */;
CREATE TABLE `responses` (
`response_id` int(10) unsigned NOT NULL AUTO_INCREMENT,
`user_id` int(10) unsigned NOT NULL,
`name` varchar(255) NOT NULL,
`data` longtext NOT NULL,
`is_html` tinyint(1) NOT NULL DEFAULT 0,
`changed` datetime NOT NULL DEFAULT '1000-01-01 00:00:00',
`del` tinyint(1) NOT NULL DEFAULT 0,
PRIMARY KEY (`response_id`),
KEY `user_responses_index` (`user_id`,`del`),
CONSTRAINT `user_id_fk_responses` FOREIGN KEY (`user_id`) REFERENCES `users` (`user_id`) ON DELETE CASCADE ON UPDATE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci ROW_FORMAT=DYNAMIC;
/*!40101 SET character_set_client = @saved_cs_client */;
--
-- Dumping data for table `responses`
--
LOCK TABLES `responses` WRITE;
/*!40000 ALTER TABLE `responses` DISABLE KEYS */;
/*!40000 ALTER TABLE `responses` ENABLE KEYS */;
UNLOCK TABLES;
/*!40103 SET TIME_ZONE=@OLD_TIME_ZONE */;
/*!40101 SET SQL_MODE=@OLD_SQL_MODE */;
/*!40014 SET FOREIGN_KEY_CHECKS=@OLD_FOREIGN_KEY_CHECKS */;
/*!40014 SET UNIQUE_CHECKS=@OLD_UNIQUE_CHECKS */;
/*!40101 SET CHARACTER_SET_CLIENT=@OLD_CHARACTER_SET_CLIENT */;
/*!40101 SET CHARACTER_SET_RESULTS=@OLD_CHARACTER_SET_RESULTS */;
/*!40101 SET COLLATION_CONNECTION=@OLD_COLLATION_CONNECTION */;
/*!40111 SET SQL_NOTES=@OLD_SQL_NOTES */;
-- Dump completed on 2023-05-28 13:55:55