react-native SQLite-storage INSERT statement - reactjs

Question

I use react-native react-native-sqlite-storage in my project and I am struggling to insert data
I managed to successfully read the pre populated table I created in
./android/app/src/main/assets/Mydb.db
but the INSERT statement somehow does not work.
simplified sample code:
import React, { Component } from 'react';
import SQLite from 'react-native-sqlite-storage';
let db;
class App extends Component {
constructor(props) {
// SQLite connection / config settings
db = SQLite.openDatabase({ name: 'testTable', //Name of my table
createFromLocation: "~MyDB.db", // Name of my DB
});
}
selectExample = () => { // working
db.transaction((tx) => {
tx.executeSql('SELECT * FROM testTable', [], (tx, results) => {
console.log("Query completed");
var len = results.rows.length;
for (let i = 0; i < len; i++) {
let row = results.rows.item(i);
console.log(`My AWG: ${row.AWG}, My Metric: ${row.metric}`);
}
});
});
}
updateDatabase = () => { // not working
db.transaction((tx) => {
tx.executeSql('Insert into testTable (AWG, metric) VALUES (?,?)',
[28,0.5],
(tx,results) => {
console.log("Results", results.rowsAffected);
},(err) => {
console.error(err);
}
)
})
}
onPress = () => {
this.selectExample(); // working
this.updateDatabase(); // issue
}
render() {
return (
<View>
<TouchableOpacity style = {styles.button} onPress={() => this.onPress() } />
</View>
);
}
in the console I get Results 1 as feedback, so the query seems fine but when I open MyDB.db with the mac app: DB Browser for SQLite, no changes happened no new rows..
Am I missing something here?