diff --git a/db/ddl.sql b/db/ddl.sql
new file mode 100644
index 0000000..d38a249
--- /dev/null
+++ b/db/ddl.sql
@@ -0,0 +1,45 @@
+create table main.menu
+(
+    name       text
+        constraint menu_pk
+            primary key,
+    label      text,
+    order_num  integer,
+    expression text
+);
+
+create table main.roll_result
+(
+    datestr text
+        constraint roll_result_pk
+            primary key,
+    value   text
+);
+
+create table main.sqlite_master
+(
+    type     TEXT,
+    name     TEXT,
+    tbl_name TEXT,
+    rootpage INT,
+    sql      TEXT
+);
+
+create table main.user_menu
+(
+    user     text,
+    menu     text,
+    datestr  text,
+    nickname text,
+    primary key (user, datestr),
+    constraint user_menu_pk
+        unique (nickname, datestr)
+);
+
+create table main.users
+(
+    nickname text
+        constraint users_pk
+            primary key
+);
+
diff --git a/src/dao.py b/src/dao.py
index 8d3784b..466f95e 100644
--- a/src/dao.py
+++ b/src/dao.py
@@ -6,39 +6,6 @@ from utils import get_user
 
 db_path = './data.sqlite3'
 
-ddl_db = sqlite3.connect(db_path)
-ddl_cursor = ddl_db.cursor()
-try:
-    ddl_cursor.execute('''
-create table if not exists user_menu
-(
-    user    text,
-    menu    text,
-    datestr text,
-    primary key (user, datestr)
-)
-''')
-    ddl_cursor.execute('''
-create table if not exists roll_result
-(
-    datestr text primary key,
-    value   text
-)
-    ''')
-    ddl_cursor.execute('''
-create table if not exists menu
-(
-    name text primary key,
-    label   text,
-    order_num   integer,
-    expression   text
-)
-    ''')
-    ddl_db.commit()
-finally:
-    ddl_cursor.close()
-    ddl_db.close()
-
 
 def get_user_menu() -> tuple[str, str]:
     """