Working offline mode, + synchronization (ionic 3)

Hi everybody,
I am developing an app in ionic3 framework and i want to use PostgreSQL as database. I want to work my app on offline (sqlite) and sync the data to my database.I found PouchDB which works as a local storage and sync with CouchDB(NoSQL solution) . there is any other local storage which work offline and sync with postgresql data base ?, (documentation,tutorials,…)