fix: Add the created column in store table

Add the created column in store table to save the stored object created timestamp.

Signed-off-by: Lindsey Cheng <beckysocute@gmail.com>

res/db/sql/01-tables.sql

@@ -6,5 +6,6 @@
 -- app_svc.store is used to save StoredObject as JSONB on failure
 CREATE TABLE IF NOT EXISTS app_svc.store (
     id UUID PRIMARY KEY,
+    created timestamp NOT NULL DEFAULT now(),
     content JSONB NOT NULL
 );