requires the following mysql db sctructure:

CREATE TABLE `user_chats` (
	`user_id` BIGINT(20) NOT NULL DEFAULT '0',
	`chat_id` BIGINT(20) NOT NULL DEFAULT '0',
	`dt_create` DATETIME NOT NULL,
	PRIMARY KEY (`user_id`, `chat_id`) USING BTREE
)
COLLATE='utf8mb4_general_ci'
ENGINE=InnoDB
;

CREATE TABLE `user` (
	`user_id` BIGINT(20) NOT NULL,
	`is_bot` TINYINT(1) NOT NULL,
	`language_code` VARCHAR(10) NULL DEFAULT NULL COLLATE 'utf8mb4_general_ci',
	`username` VARCHAR(100) NULL DEFAULT NULL COLLATE 'utf8mb4_general_ci',
	`first_name` VARCHAR(100) NULL DEFAULT NULL COLLATE 'utf8mb4_general_ci',
	`last_name` VARCHAR(100) NULL DEFAULT NULL COLLATE 'utf8mb4_general_ci',
	`role` ENUM('user','admin','developer') NOT NULL DEFAULT 'user' COLLATE 'utf8mb4_general_ci',
	`dt_create` DATETIME NOT NULL,
	`dt_update` DATETIME NULL DEFAULT NULL,
	`dt_unsubscribe` DATETIME NULL DEFAULT NULL,
	`unsubscribed` TINYINT(1) NOT NULL DEFAULT '0',
	PRIMARY KEY (`user_id`) USING BTREE
)
COLLATE='utf8mb4_general_ci'
ENGINE=InnoDB
;


CREATE TABLE `session` (
	`session_key` VARCHAR(250) NOT NULL COLLATE 'utf8mb4_general_ci',
	`user_id` BIGINT(20) UNSIGNED NOT NULL DEFAULT '0',
	`language_code` VARCHAR(10) NULL DEFAULT NULL COLLATE 'utf8mb4_general_ci',
	`data` MEDIUMTEXT NULL DEFAULT NULL COLLATE 'utf8mb4_general_ci',
	`handler_history` MEDIUMTEXT NULL DEFAULT NULL COLLATE 'utf8mb4_general_ci',
	`keyboard` MEDIUMTEXT NULL DEFAULT NULL COLLATE 'utf8mb4_general_ci',
	`expected_input` MEDIUMTEXT NULL DEFAULT NULL COLLATE 'utf8mb4_general_ci',
	`dt_access` DATETIME NOT NULL,
	PRIMARY KEY (`session_key`) USING BTREE,
	INDEX `user` (`user_id`) USING BTREE
)
COLLATE='utf8mb4_general_ci'
ENGINE=InnoDB
;

CREATE TABLE `message_info` (
	`message_id` BIGINT(20) NOT NULL,
	`user_id` BIGINT(20) NULL DEFAULT NULL,
	`chat_id` BIGINT(20) NOT NULL,
	`data` TEXT NULL DEFAULT NULL COLLATE 'utf8mb4_general_ci',
	`dt_create` DATETIME NULL DEFAULT NULL,
	PRIMARY KEY (`message_id`, `chat_id`) USING BTREE,
	INDEX `user_id` (`user_id`) USING BTREE
)
COLLATE='utf8mb4_general_ci'
ENGINE=InnoDB
;