schema update, no sender name required.

storage/schema.go

@@ -126,7 +126,6 @@ const SchemaUsersNotifications = `
 CREATE TABLE IF NOT EXISTS users_notification (
 	id INTEGER PRIMARY KEY AUTOINCREMENT,
 	user_id INTEGER NOT NULL REFERENCES users(id),
-	sender_name VARCHAR(100),
 	subject TEXT,
 	body TEXT,
 	is_read BOOLEAN DEFAULT FALSE,