init commit

store/migration/sqlite/0.4/00__user_setting.sql

@@ -0,0 +1,9 @@
+-- user_setting
+CREATE TABLE user_setting (
+  user_id INTEGER NOT NULL,
+  key TEXT NOT NULL,
+  value TEXT NOT NULL,
+  FOREIGN KEY(user_id) REFERENCES user(id) ON DELETE CASCADE
+);
+
+CREATE UNIQUE INDEX user_setting_key_user_id_index ON user_setting(key, user_id);