Fix Detect Magic to have one debuff per caster. (#2609)

sql/migrations/20240504222324_world.sql

@@ -0,0 +1,21 @@
+DROP PROCEDURE IF EXISTS add_migration;
+DELIMITER ??
+CREATE PROCEDURE `add_migration`()
+BEGIN
+DECLARE v INT DEFAULT 1;
+SET v = (SELECT COUNT(*) FROM `migrations` WHERE `id`='20240504222324');
+IF v = 0 THEN
+INSERT INTO `migrations` VALUES ('20240504222324');
+-- Add your query below.
+
+
+-- Fix Detect Magic to have one debuff per caster
+UPDATE `spell_template` SET `customFlags`=4096 WHERE `entry`=2855;
+
+
+-- End of migration.
+END IF;
+END??
+DELIMITER ;
+CALL add_migration();
+DROP PROCEDURE IF EXISTS add_migration;