Add missing database constraints.

application/migrations/20190612100000_dbfix.php

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+<?php if (!defined('BASEPATH')) exit('No direct script access allowed');
+
+class Migration_DBFix extends CI_Migration
+{
+	public function __construct()
+	{
+		parent::__construct();
+	}
+
+	public function up()
+	{
+		execute_script(APPPATH . 'migrations/sqlscripts/3.3.0_dbfix.sql');
+	}
+
+	public function down()
+	{
+
+	}
+}
+?>

application/migrations/sqlscripts/3.3.0_dbfix.sql

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+ALTER TABLE `ospos_sales_payments` ADD INDEX `employee_id` (`employee_id`);
+
+ALTER TABLE `ospos_sales_payments`
+  ADD CONSTRAINT `ospos_sales_payments_ibfk_2` FOREIGN KEY (`employee_id`) REFERENCES `ospos_employees` (`person_id`);
+
+ALTER TABLE `ospos_customers` ADD INDEX `sales_tax_code_id` (`sales_tax_code_id`);
+
+ALTER TABLE `ospos_customers`
+  ADD CONSTRAINT `ospos_customers_ibfk_3` FOREIGN KEY (`sales_tax_code_id`) REFERENCES `ospos_tax_codes` (`tax_code_id`);
+
+ALTER TABLE `ospos_tax_rates` ADD INDEX `rate_tax_category_id` (`rate_tax_category_id`);
+
+ALTER TABLE `ospos_tax_rates`
+  ADD CONSTRAINT `ospos_tax_rates_ibfk_1` FOREIGN KEY (`rate_tax_category_id`) REFERENCES `ospos_tax_categories` (`tax_category_id`);
+
+ALTER TABLE `ospos_tax_rates` ADD INDEX `rate_tax_code_id` (`rate_tax_code_id`);
+
+ALTER TABLE `ospos_tax_rates`
+  ADD CONSTRAINT `ospos_tax_rates_ibfk_2` FOREIGN KEY (`rate_tax_code_id`) REFERENCES `ospos_tax_codes` (`tax_code_id`);
+
+ALTER TABLE `ospos_tax_rates` ADD INDEX `rate_jurisdiction_id` (`rate_jurisdiction_id`);
+
+ALTER TABLE `ospos_tax_rates`
+  ADD CONSTRAINT `ospos_tax_rates_ibfk_3` FOREIGN KEY (`rate_jurisdiction_id`) REFERENCES `ospos_tax_jurisdictions` (`jurisdiction_id`);
+
+ALTER TABLE `ospos_receivings` ADD INDEX `receiving_time` (`receiving_time`);
+
+ALTER TABLE `ospos_sales_payments` ADD INDEX `payment_time` (`payment_time`);
+
+ALTER TABLE `ospos_inventory` ADD INDEX `trans_date` (`trans_date`);