NPCBots: Fix hire_time default value 2

sql/Bots/updates/characters/2024_03_12_00_characters_npcbot.sql

@@ -1,3 +1,20 @@
 --
-ALTER TABLE `characters_npcbot` ADD `hire_time` timestamp NULL DEFAULT '1970-01-01 07:00:01' AFTER `faction`;
-UPDATE `characters_npcbot` SET `hire_time` = CURRENT_TIMESTAMP() WHERE `owner` != 0;
+/*!50003 DROP PROCEDURE IF EXISTS `sp__drop_column_if_exists`*/;
+DELIMITER ;;
+/*!50003 CREATE*/
+/*!50003 PROCEDURE `sp__drop_column_if_exists`(`@TABLE` varchar(100), `@COLUMN` varchar(100))
+BEGIN
+DECLARE `@EXISTS` INT DEFAULT 0;
+SELECT COUNT(*) INTO `@EXISTS` FROM `information_schema`.`columns`WHERE `TABLE_SCHEMA` = DATABASE() AND `TABLE_NAME` = `@TABLE` AND `COLUMN_NAME` = `@COLUMN`;
+IF (`@EXISTS` > 0) THEN
+    ALTER TABLE `characters_npcbot` DROP COLUMN `hire_time`;
+END IF;
+END */;;
+
+DELIMITER ;
+
+CALL `sp__drop_column_if_exists`('characters_npcbot', 'hire_time');
+
+DROP PROCEDURE IF EXISTS `sp__drop_column_if_exists`;
+
+ALTER TABLE `characters_npcbot` ADD `hire_time` timestamp NULL DEFAULT CURRENT_TIMESTAMP AFTER `faction`;