diff --git a/sql.go b/sql.go
index 4335404..6a3dd6c 100644
--- a/sql.go
+++ b/sql.go
@@ -49,7 +49,7 @@ func initDB() {
 							,name		VARCHAR(80) NOT NULL
 							,PRIMARY KEY (id)
 							,UNIQUE KEY (intl_id)
-						  ) ENGINE = InnoDB CHARSET=utf8mb4 COLLATE utf8mb4_general_ci;`)
+						  ) ENGINE = InnoDB CHARSET=utf8mb4 COLLATE utf8mb4_bin;`)
 	failOnError(err, "initDB : create table code_obj_type")
 	log.Println("initDB : code_obj_type created ...")
 
@@ -61,7 +61,7 @@ func initDB() {
 							,PRIMARY KEY (id)
 							,UNIQUE KEY (intl_id)
 							,FOREIGN KEY (obj_type_id) REFERENCES code_obj_type(id) ON DELETE CASCADE
-						  ) ENGINE = InnoDB CHARSET=utf8mb4 COLLATE utf8mb4_general_ci;`)
+						  ) ENGINE = InnoDB CHARSET=utf8mb4 COLLATE utf8mb4_bin;`)
 	failOnError(err, "initDB : create table code_obj_sub_type")
 	log.Println("initDB : code_obj_sub_type created ...")
 
@@ -73,7 +73,7 @@ func initDB() {
 							,PRIMARY KEY (id)
 							,FOREIGN KEY (obj_type_id) REFERENCES code_obj_type(id) ON DELETE CASCADE
 							,FOREIGN KEY (obj_sub_type_id) REFERENCES code_obj_sub_type(id) ON DELETE CASCADE
-						  ) ENGINE = InnoDB AUTO_INCREMENT = 0 CHARSET=utf8mb4 COLLATE utf8mb4_general_ci;`)
+						  ) ENGINE = InnoDB AUTO_INCREMENT = 0 CHARSET=utf8mb4 COLLATE utf8mb4_bin;`)
 	failOnError(err, "initDB : create table obj")
 	log.Println("initDB : obj created ...")
 
@@ -82,7 +82,7 @@ func initDB() {
 							,logo               VARCHAR(32) NOT NULL
 							,name				VARCHAR(80) NOT NULL
 							,FOREIGN KEY (obj_id) REFERENCES obj(id) ON DELETE CASCADE
-						  ) ENGINE = InnoDB CHARSET=utf8mb4 COLLATE utf8mb4_general_ci;`)
+						  ) ENGINE = InnoDB CHARSET=utf8mb4 COLLATE utf8mb4_bin;`)
 	failOnError(err, "initDB : create table obj_castle")
 	log.Println("initDB : obj_guild created ...")
 
@@ -93,7 +93,7 @@ func initDB() {
 							,chat_id			BIGINT
 							,deposit_chat_id	BIGINT
 							,FOREIGN KEY (obj_id) REFERENCES obj(id) ON DELETE CASCADE
-						  ) ENGINE = InnoDB CHARSET=utf8mb4 COLLATE utf8mb4_general_ci;`)
+						  ) ENGINE = InnoDB CHARSET=utf8mb4 COLLATE utf8mb4_bin;`)
 	failOnError(err, "initDB : create table obj_guild")
 	log.Println("initDB : obj_guild created ...")
 
@@ -101,7 +101,7 @@ func initDB() {
 							 obj_id			BIGINT UNSIGNED NOT NULL
 							,name			VARCHAR(80) NOT NULL
 							,FOREIGN KEY (obj_id) REFERENCES obj(id) ON DELETE CASCADE
-						  ) ENGINE = InnoDB CHARSET=utf8mb4 COLLATE utf8mb4_general_ci;`)
+						  ) ENGINE = InnoDB CHARSET=utf8mb4 COLLATE utf8mb4_bin;`)
 	failOnError(err, "initDB : create table obj_user")
 	log.Println("initDB : obj_user created ...")
 
@@ -110,7 +110,7 @@ func initDB() {
 							,start_time			DATETIME NOT NULL
 							,end_time           DATETIME NOT NULL
 							,FOREIGN KEY (obj_id) REFERENCES obj(id) ON DELETE CASCADE
-						  ) ENGINE = InnoDB CHARSET=utf8mb4 COLLATE utf8mb4_general_ci;`)
+						  ) ENGINE = InnoDB CHARSET=utf8mb4 COLLATE utf8mb4_bin;`)
 	failOnError(err, "initDB : create table obj_war")
 	log.Println("initDB : obj_war created ...")
 
@@ -124,7 +124,7 @@ func initDB() {
 							,text           VARCHAR(4096) NOT NULL
 							,FOREIGN KEY (obj_id) REFERENCES obj(id) ON DELETE CASCADE
 							,UNIQUE KEY (msg_id, chat_id, sender_user_id)
-						  ) ENGINE = InnoDB CHARSET=utf8mb4 COLLATE utf8mb4_general_ci;`)
+						  ) ENGINE = InnoDB CHARSET=utf8mb4 COLLATE utf8mb4_bin;`)
 	failOnError(err, "initDB : create table obj_msg")
 	log.Println("initDB : obj_msg created ...")
 
@@ -135,7 +135,7 @@ func initDB() {
 							,castle_id		BIGINT UNSIGNED NOT NULL		
 							,FOREIGN KEY (obj_id) REFERENCES obj(id) ON DELETE CASCADE
 							,FOREIGN KEY (castle_id) REFERENCES obj_castle(obj_id) ON DELETE CASCADE
-						  ) ENGINE = InnoDB CHARSET=utf8mb4 COLLATE utf8mb4_general_ci;`)
+						  ) ENGINE = InnoDB CHARSET=utf8mb4 COLLATE utf8mb4_bin;`)
 	failOnError(err, "initDB : create table obj_msg_report")
 	log.Println("initDB : obj_msg_report created ...")
 
@@ -144,7 +144,7 @@ func initDB() {
 							,war_id			BIGINT UNSIGNED NOT NULL
 							,FOREIGN KEY (obj_id) REFERENCES obj(id) ON DELETE CASCADE
 							,FOREIGN KEY (war_id) REFERENCES obj(id) ON DELETE CASCADE
-						  ) ENGINE = InnoDB CHARSET=utf8mb4 COLLATE utf8mb4_general_ci;`)
+						  ) ENGINE = InnoDB CHARSET=utf8mb4 COLLATE utf8mb4_bin;`)
 	failOnError(err, "initDB : create table obj_msg_report")
 	log.Println("initDB : obj_msg_report created ...")
 
@@ -162,7 +162,7 @@ func initDB() {
 							,FOREIGN KEY (obj_id) REFERENCES obj(id) ON DELETE CASCADE
 							,FOREIGN KEY (war_id) REFERENCES obj(id) ON DELETE CASCADE
 							,UNIQUE KEY (user_id, war_id)
-						  ) ENGINE = InnoDB CHARSET=utf8mb4 COLLATE utf8mb4_general_ci;`)
+						  ) ENGINE = InnoDB CHARSET=utf8mb4 COLLATE utf8mb4_bin;`)
 	failOnError(err, "initDB : create table obj_war_report")
 	log.Println("initDB : obj_war_report created ...")
 
@@ -189,7 +189,7 @@ func initDB() {
 							,FOREIGN KEY (seller_castle_id) REFERENCES obj_castle(obj_id) ON DELETE CASCADE
 							,FOREIGN KEY (buyer_castle_id) REFERENCES obj_castle(obj_id) ON DELETE CASCADE
 							,KEY (lot_id)
-						  ) ENGINE = InnoDB CHARSET=utf8mb4 COLLATE utf8mb4_general_ci;`)
+						  ) ENGINE = InnoDB CHARSET=utf8mb4 COLLATE utf8mb4_bin;`)
 	failOnError(err, "initDB : create table obj_msg_auction_announce")
 	log.Println("initDB : obj_msg_auction_announce created ...")
 
@@ -198,7 +198,7 @@ func initDB() {
 							,date				DATETIME NOT NULL
 							,FOREIGN KEY (obj_id) REFERENCES obj(id) ON DELETE CASCADE
 							,UNIQUE KEY (date)
-						  ) ENGINE = InnoDB CHARSET=utf8mb4 COLLATE utf8mb4_general_ci;`)
+						  ) ENGINE = InnoDB CHARSET=utf8mb4 COLLATE utf8mb4_bin;`)
 	failOnError(err, "initDB : create table obj_msg_mini_war")
 	log.Println("initDB : obj_msg_mini_war created ...")
 
@@ -213,7 +213,7 @@ func initDB() {
 							,FOREIGN KEY (obj_id) REFERENCES obj(id) ON DELETE CASCADE
 							,FOREIGN KEY (castle_id) REFERENCES obj_castle(obj_id) ON DELETE CASCADE
 							,UNIQUE KEY (obj_id, castle_id)
-						  ) ENGINE = InnoDB CHARSET=utf8mb4 COLLATE utf8mb4_general_ci;`)
+						  ) ENGINE = InnoDB CHARSET=utf8mb4 COLLATE utf8mb4_bin;`)
 	failOnError(err, "initDB : create table obj_msg_mini_war_castle")
 	log.Println("initDB : obj_msg_mini_war_castle created ...")
 
@@ -236,7 +236,7 @@ func initDB() {
 							,FOREIGN KEY (loss_guild_id) REFERENCES obj_guild(obj_id) ON DELETE CASCADE
 							,FOREIGN KEY (win_user_id) REFERENCES obj_user(obj_id) ON DELETE CASCADE
 							,FOREIGN KEY (loss_user_id) REFERENCES obj_user(obj_id) ON DELETE CASCADE
-						  ) ENGINE = InnoDB CHARSET=utf8mb4 COLLATE utf8mb4_general_ci;`)
+						  ) ENGINE = InnoDB CHARSET=utf8mb4 COLLATE utf8mb4_bin;`)
 	failOnError(err, "initDB : create table obj_msg_duel_fight")
 	log.Println("initDB : obj_msg_duel_fight created ...")
 
@@ -245,7 +245,7 @@ func initDB() {
 							,lot_id         BIGINT UNSIGNED NOT NULL
 							,FOREIGN KEY (obj_id) REFERENCES obj(id) ON DELETE CASCADE
 							,KEY (lot_id)
-						  ) ENGINE = InnoDB CHARSET=utf8mb4 COLLATE utf8mb4_general_ci;`)
+						  ) ENGINE = InnoDB CHARSET=utf8mb4 COLLATE utf8mb4_bin;`)
 	failOnError(err, "initDB : create table obj_msg_auction_upd_req")
 	log.Println("initDB : obj_msg_auction_upd_req created ...")
 
@@ -255,7 +255,7 @@ func initDB() {
 							,buyer			VARCHAR(32)
 							,item			VARCHAR(80)
 							,FOREIGN KEY (obj_id) REFERENCES obj(id) ON DELETE CASCADE
-						  ) ENGINE = InnoDB CHARSET=utf8mb4 COLLATE utf8mb4_general_ci;`)
+						  ) ENGINE = InnoDB CHARSET=utf8mb4 COLLATE utf8mb4_bin;`)
 	failOnError(err, "initDB : create table obj_msg_auction_upd_ack")
 	log.Println("initDB : obj_msg_auction_upd_ack created ...")
 
@@ -266,7 +266,7 @@ func initDB() {
 							,rule           VARCHAR(4096) NOT NULL
 							,msg_type_id	SMALLINT UNSIGNED NOT NULL
 							,UNIQUE KEY (id)
-						  ) ENGINE = InnoDB CHARSET=utf8mb4 COLLATE utf8mb4_general_ci;`)
+						  ) ENGINE = InnoDB CHARSET=utf8mb4 COLLATE utf8mb4_bin;`)
 	failOnError(err, "initDB : create table msg_rules")
 	log.Println("initDB : msg_rules created ...")
 
@@ -276,7 +276,7 @@ func initDB() {
 							,weight         SMALLINT NOT NULL
 							,FOREIGN KEY (obj_id) REFERENCES obj(id) ON DELETE CASCADE
 							,UNIQUE KEY (intl_id)
-						  ) ENGINE = InnoDB CHARSET=utf8mb4 COLLATE utf8mb4_general_ci;`)
+						  ) ENGINE = InnoDB CHARSET=utf8mb4 COLLATE utf8mb4_bin;`)
 	failOnError(err, "initDB : create table obj_item")
 	log.Println("initDB : obj_item created ...")
 
@@ -291,7 +291,7 @@ func initDB() {
 							,FOREIGN KEY (user_id) REFERENCES obj_user(obj_id) ON DELETE CASCADE
 							,FOREIGN KEY (item_id) REFERENCES obj_item(obj_id) ON DELETE CASCADE
 							,UNIQUE KEY (user_id, date)
-						  ) ENGINE = InnoDB CHARSET=utf8mb4 COLLATE utf8mb4_general_ci;`)
+						  ) ENGINE = InnoDB CHARSET=utf8mb4 COLLATE utf8mb4_bin;`)
 	failOnError(err, "initDB : create table obj_tribute")
 	log.Println("initDB : obj_tribute created ...")
 
@@ -305,7 +305,7 @@ func initDB() {
 							,FOREIGN KEY (obj_id) REFERENCES obj(id) ON DELETE CASCADE
 							,FOREIGN KEY (user_id) REFERENCES obj_user(obj_id) ON DELETE CASCADE
 							,UNIQUE KEY (user_id, date)
-						  ) ENGINE = InnoDB CHARSET=utf8mb4 COLLATE utf8mb4_general_ci;`)
+						  ) ENGINE = InnoDB CHARSET=utf8mb4 COLLATE utf8mb4_bin;`)
 	failOnError(err, "initDB : create table obj_xp")
 	log.Println("initDB : obj_xp created ...")
 
@@ -327,7 +327,7 @@ func initDB() {
 							,KEY (is_done)
 							,KEY (in_work)
 							,KEY (user_id)
-						  ) ENGINE = InnoDB CHARSET=utf8mb4 COLLATE utf8mb4_general_ci;`)
+						  ) ENGINE = InnoDB CHARSET=utf8mb4 COLLATE utf8mb4_bin;`)
 	failOnError(err, "initDB : create table obj_job")
 	log.Println("initDB : obj_job created ...")
 
@@ -337,7 +337,7 @@ func initDB() {
 							,priority       INT UNSIGNED NOT NULL
 							,FOREIGN KEY (obj_id) REFERENCES obj(id) ON DELETE CASCADE
 							,UNIQUE KEY(name)
-						  ) ENGINE = InnoDB CHARSET=utf8mb4 COLLATE utf8mb4_general_ci;`)
+						  ) ENGINE = InnoDB CHARSET=utf8mb4 COLLATE utf8mb4_bin;`)
 	failOnError(err, "initDB : create table obj_name")
 	log.Println("initDB : obj_name created ...")