Cannot forward engineer this database from MySQL Workbench - mysql

Question

Using MySQL Workbench I'm trying to forward engineer a schema, but I keep getting the message:
ERROR: Error 1022: Can't write; duplicate key in table 'tbl_banner_ad'
I've looked at similar problems but all the solutions say delete this or delete that but I don't want to delete something that then impacts how my database works.
From my SQL below can anyone tell me what I need to do that will get rid of this error but won't get rid of any referential integrity or anything like that:
SET #OLD_UNIQUE_CHECKS=##UNIQUE_CHECKS, UNIQUE_CHECKS=0;
SET #OLD_FOREIGN_KEY_CHECKS=##FOREIGN_KEY_CHECKS, FOREIGN_KEY_CHECKS=0;
SET #OLD_SQL_MODE=##SQL_MODE, SQL_MODE='TRADITIONAL,ALLOW_INVALID_DATES';
-- -----------------------------------------------------
-- Schema ibn_db
-- -----------------------------------------------------
DROP SCHEMA IF EXISTS `ibn_db` ;
CREATE SCHEMA IF NOT EXISTS `ibn_db` DEFAULT CHARACTER SET utf8 COLLATE utf8_general_ci ;
USE `ibn_db` ;
-- -----------------------------------------------------
-- Table `ibn_db`.`tbl_users`
-- -----------------------------------------------------
DROP TABLE IF EXISTS `ibn_db`.`tbl_users` ;
CREATE TABLE IF NOT EXISTS `ibn_db`.`tbl_users` (
`_id` INT UNSIGNED ZEROFILL NOT NULL AUTO_INCREMENT,
`name` VARCHAR(80) NOT NULL,
`email` VARCHAR(255) NOT NULL,
`address_building` VARCHAR(80) NULL,
`address_street` VARCHAR(80) NOT NULL,
`address_city` VARCHAR(80) NOT NULL,
`address_county` VARCHAR(80) NULL,
`address_postcode` VARCHAR(13) NOT NULL,
`address_country` VARCHAR(80) NULL,
`is_admin` TINYINT(1) NOT NULL DEFAULT 0,
`phone` VARCHAR(15) NOT NULL,
`company` VARCHAR(80) NULL,
`banned` TINYINT(1) NOT NULL DEFAULT 0,
`ban_reason` VARCHAR(160) NULL,
`ban_expiry_date` DATETIME NULL,
`password` VARCHAR(128) NOT NULL,
`salt` VARCHAR(128) NOT NULL,
`joined_datetime` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
`last_modified_datetime` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
PRIMARY KEY (`_id`),
UNIQUE INDEX `email_UNIQUE` (`email` ASC))
ENGINE = InnoDB;
-- -----------------------------------------------------
-- Table `ibn_db`.`tbl_unauthorized_users`
-- -----------------------------------------------------
DROP TABLE IF EXISTS `ibn_db`.`tbl_unauthorized_users` ;
CREATE TABLE IF NOT EXISTS `ibn_db`.`tbl_unauthorized_users` (
`_id` INT UNSIGNED ZEROFILL NOT NULL AUTO_INCREMENT,
`email` VARCHAR(255) NOT NULL,
`password` VARCHAR(128) NOT NULL,
`salt` VARCHAR(128) NOT NULL,
`activation_hash` VARCHAR(128) NOT NULL,
`created_datetime` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
PRIMARY KEY (`_id`),
UNIQUE INDEX `email_UNIQUE` (`email` ASC),
UNIQUE INDEX `activation_hash_UNIQUE` (`activation_hash` ASC))
ENGINE = InnoDB;
-- -----------------------------------------------------
-- Table `ibn_db`.`tbl_events`
-- -----------------------------------------------------
DROP TABLE IF EXISTS `ibn_db`.`tbl_events` ;
CREATE TABLE IF NOT EXISTS `ibn_db`.`tbl_events` (
`_id` INT ZEROFILL UNSIGNED NOT NULL AUTO_INCREMENT,
`name` VARCHAR(80) NOT NULL,
`description` MEDIUMTEXT NULL,
`start_datetime` DATETIME NOT NULL,
`end_datetime` DATETIME NOT NULL,
`created_datetime` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
`last_modified_datetime` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
`address_building` VARCHAR(80) NULL,
`address_street` VARCHAR(80) NOT NULL,
`address_city` VARCHAR(80) NOT NULL,
`address_county` VARCHAR(80) NULL,
`address_postcode` VARCHAR(13) NOT NULL,
`address_country` VARCHAR(80) NULL,
`image_url` VARCHAR(255) NULL,
PRIMARY KEY (`_id`))
ENGINE = InnoDB;
-- -----------------------------------------------------
-- Table `ibn_db`.`tbl_payments`
-- -----------------------------------------------------
DROP TABLE IF EXISTS `ibn_db`.`tbl_payments` ;
CREATE TABLE IF NOT EXISTS `ibn_db`.`tbl_payments` (
`_id` INT ZEROFILL UNSIGNED NOT NULL AUTO_INCREMENT,
PRIMARY KEY (`_id`))
ENGINE = InnoDB;
-- -----------------------------------------------------
-- Table `ibn_db`.`tbl_attendee`
-- -----------------------------------------------------
DROP TABLE IF EXISTS `ibn_db`.`tbl_attendee` ;
CREATE TABLE IF NOT EXISTS `ibn_db`.`tbl_attendee` (
`_id` INT ZEROFILL UNSIGNED NOT NULL AUTO_INCREMENT,
`user_id` INT UNSIGNED NOT NULL,
`event_id` INT UNSIGNED NOT NULL,
`payment_id` INT UNSIGNED NOT NULL,
`created_datetime` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
PRIMARY KEY (`_id`),
INDEX `user_id_idx` (`user_id` ASC),
INDEX `event_id_idx` (`event_id` ASC),
INDEX `payment_id_idx` (`payment_id` ASC),
CONSTRAINT `user_id`
FOREIGN KEY (`user_id`)
REFERENCES `ibn_db`.`tbl_users` (`_id`)
ON DELETE CASCADE
ON UPDATE CASCADE,
CONSTRAINT `event_id`
FOREIGN KEY (`event_id`)
REFERENCES `ibn_db`.`tbl_events` (`_id`)
ON DELETE CASCADE
ON UPDATE CASCADE,
CONSTRAINT `payment_id`
FOREIGN KEY (`payment_id`)
REFERENCES `ibn_db`.`tbl_payments` (`_id`)
ON DELETE NO ACTION
ON UPDATE NO ACTION)
ENGINE = InnoDB;
-- -----------------------------------------------------
-- Table `ibn_db`.`tbl_banner_ad`
-- -----------------------------------------------------
DROP TABLE IF EXISTS `ibn_db`.`tbl_banner_ad` ;
CREATE TABLE IF NOT EXISTS `ibn_db`.`tbl_banner_ad` (
`_id` INT UNSIGNED ZEROFILL NOT NULL AUTO_INCREMENT,
`user_id` INT UNSIGNED NOT NULL,
`payment_id` INT UNSIGNED NOT NULL,
`url` VARCHAR(255) NOT NULL,
`width` INT UNSIGNED NOT NULL,
`height` INT UNSIGNED NOT NULL,
`created_datetime` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
PRIMARY KEY (`_id`),
INDEX `user_id_idx` (`user_id` ASC),
INDEX `payment_id_idx` (`payment_id` ASC),
CONSTRAINT `payment_id`
FOREIGN KEY (`payment_id`)
REFERENCES `ibn_db`.`tbl_payments` (`_id`)
ON DELETE NO ACTION
ON UPDATE NO ACTION,
CONSTRAINT `user_id`
FOREIGN KEY (`user_id`)
REFERENCES `ibn_db`.`tbl_users` (`_id`)
ON DELETE NO ACTION
ON UPDATE NO ACTION)
ENGINE = InnoDB;
-- -----------------------------------------------------
-- Table `ibn_db`.`tbl_reviews`
-- -----------------------------------------------------
DROP TABLE IF EXISTS `ibn_db`.`tbl_reviews` ;
CREATE TABLE IF NOT EXISTS `ibn_db`.`tbl_reviews` (
`_id` INT UNSIGNED ZEROFILL NOT NULL AUTO_INCREMENT,
`user_id` INT UNSIGNED NOT NULL,
`event_id` INT UNSIGNED NOT NULL,
`comment` VARCHAR(255) NULL,
`stars` INT NULL,
PRIMARY KEY (`_id`),
INDEX `user_id_idx` (`user_id` ASC),
INDEX `event_id_idx` (`event_id` ASC),
CONSTRAINT `user_id`
FOREIGN KEY (`user_id`)
REFERENCES `ibn_db`.`tbl_users` (`_id`)
ON DELETE NO ACTION
ON UPDATE NO ACTION,
CONSTRAINT `event_id`
FOREIGN KEY (`event_id`)
REFERENCES `ibn_db`.`tbl_events` (`_id`)
ON DELETE NO ACTION
ON UPDATE NO ACTION)
ENGINE = InnoDB;
-- -----------------------------------------------------
-- Table `ibn_db`.`tbl_login_attempts`
-- -----------------------------------------------------
DROP TABLE IF EXISTS `ibn_db`.`tbl_login_attempts` ;
CREATE TABLE IF NOT EXISTS `ibn_db`.`tbl_login_attempts` (
`_id` INT UNSIGNED ZEROFILL NOT NULL AUTO_INCREMENT,
`user_id` INT UNSIGNED NOT NULL,
`time` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
`ip` VARCHAR(45) NOT NULL,
`success` TINYINT(1) NOT NULL,
`fail_reason` VARCHAR(160) NULL,
PRIMARY KEY (`_id`),
INDEX `user_id_idx` (`user_id` ASC),
CONSTRAINT `user_id`
FOREIGN KEY (`user_id`)
REFERENCES `ibn_db`.`tbl_users` (`_id`)
ON DELETE CASCADE
ON UPDATE CASCADE)
ENGINE = InnoDB;
SET SQL_MODE=#OLD_SQL_MODE;
SET FOREIGN_KEY_CHECKS=#OLD_FOREIGN_KEY_CHECKS;
SET UNIQUE_CHECKS=#OLD_UNIQUE_CHECKS;
EDIT: I've tried deleting the INDEX statements from tbl_banner_ads but I can't delete it because the index is part of the foreign key.

Answer 1

Try and change the CREATE for tbl_banner_ad. Change this part:
CONSTRAINT `payment_id`
FOREIGN KEY (`payment_id`)
REFERENCES `ibn_db`.`tbl_payments` (`_id`)
ON DELETE NO ACTION
ON UPDATE NO ACTION,
CONSTRAINT `user_id`
FOREIGN KEY (`user_id`)
REFERENCES `ibn_db`.`tbl_users` (`_id`)
ON DELETE NO ACTION
ON UPDATE NO ACTION)
to:
CONSTRAINT `payment_id1`
FOREIGN KEY (`payment_id`)
REFERENCES `ibn_db`.`tbl_payments` (`_id`)
ON DELETE NO ACTION
ON UPDATE NO ACTION,
CONSTRAINT `user_id1`
FOREIGN KEY (`user_id`)
REFERENCES `ibn_db`.`tbl_users` (`_id`)
ON DELETE NO ACTION
ON UPDATE NO ACTION)
(Alternatively, you could name the constraints to reflect both the parent and child tablenames as well as the columnn-name. I.e. tbl_payment_tbl_banner_ad_payment_id.