diff --git a/src/main/resources/db/migration/mariadb/V1000_22__chusan_unique.sql b/src/main/resources/db/migration/mariadb/V1000_22__chusan_unique.sql
new file mode 100644
index 00000000..606ec292
--- /dev/null
+++ b/src/main/resources/db/migration/mariadb/V1000_22__chusan_unique.sql
@@ -0,0 +1,91 @@
+# Delete duplicate rows
+DELETE FROM chusan_user_map_area
+WHERE id NOT IN (
+    SELECT MAX(id)
+    FROM chusan_user_map_area
+    GROUP BY user_id, map_area_id
+);
+
+DELETE FROM chusan_user_character
+WHERE id NOT IN (
+    SELECT MAX(id)
+    FROM chusan_user_character
+    GROUP BY user_id, character_id
+);
+
+DELETE FROM chusan_user_item
+WHERE id NOT IN (
+    SELECT MAX(id)
+    FROM chusan_user_item
+    GROUP BY user_id, item_id, item_kind
+);
+
+DELETE FROM chusan_user_music_detail
+WHERE id NOT IN (
+    SELECT MAX(id)
+    FROM chusan_user_music_detail
+    GROUP BY user_id, music_id, level
+);
+
+DELETE FROM chusan_user_activity
+WHERE id NOT IN (
+    SELECT MAX(id)
+    FROM chusan_user_activity
+    GROUP BY user_id, activity_id, kind
+);
+
+DELETE FROM chusan_user_charge
+WHERE id NOT IN (
+    SELECT MAX(id)
+    FROM chusan_user_charge
+    GROUP BY user_id, charge_id
+);
+
+DELETE FROM chusan_user_course
+WHERE id NOT IN (
+    SELECT MAX(id)
+    FROM chusan_user_course
+    GROUP BY user_id, course_id
+);
+
+DELETE FROM chusan_user_duel
+WHERE id NOT IN (
+    SELECT MAX(id)
+    FROM chusan_user_duel
+    GROUP BY user_id, duel_id
+);
+
+DELETE FROM chusan_user_general_data
+WHERE id NOT IN (
+    SELECT MAX(id)
+    FROM chusan_user_general_data
+    GROUP BY user_id, property_key
+);
+
+# Add unique constraint
+ALTER TABLE chusan_user_map_area
+    ADD CONSTRAINT unique_user_map_area UNIQUE (user_id, map_area_id);
+
+ALTER TABLE chusan_user_character
+    ADD CONSTRAINT unique_user_character UNIQUE (user_id, character_id);
+
+ALTER TABLE chusan_user_item
+    ADD CONSTRAINT unique_user_item UNIQUE (user_id, item_id, item_kind);
+
+ALTER TABLE chusan_user_music_detail
+    ADD CONSTRAINT unique_user_music_detail UNIQUE (user_id, music_id, level);
+
+ALTER TABLE chusan_user_activity
+    ADD CONSTRAINT unique_user_activity UNIQUE (user_id, activity_id, kind);
+
+ALTER TABLE chusan_user_charge
+    ADD CONSTRAINT unique_user_charge UNIQUE (user_id, charge_id);
+
+ALTER TABLE chusan_user_course
+    ADD CONSTRAINT unique_user_course UNIQUE (user_id, course_id);
+
+ALTER TABLE chusan_user_duel
+    ADD CONSTRAINT unique_user_duel UNIQUE (user_id, duel_id);
+
+ALTER TABLE chusan_user_general_data
+    ADD CONSTRAINT unique_user_general_data UNIQUE (user_id, property_key);