Ionic3 - fastest way to syncronize big JSON file data with Sqlite - json

Question

Good afternoon, I am creating an application in ionic using angular where currently it handles two connection modes: connected if the user has internet access and disconnected if they do not have it
Currently I have a feature and it is that the user has the possibility to sync data and apply in SQLite
like this JSON (to syncronize)
{
countries: [/* 200+ records */],
vaccine: [/* 3000+ records */],
... other 20 keys
}
and the SQLite structure(mobile) has a table per key like this
CREATE TABLE IF NOT EXISTS countries(
id INTEGER PRIMARY KEY,
code TEXT NOT NULL,
name TEXT NULL,
--- other columns
);
CREATE TABLE IF NOT EXISTS vaccine(
id INTEGER PRIMARY KEY,
name TEXT NULL,
--- other columns
);
How can I execute the synchronization process without executing sql per cycle? but validating that if the row exists, update it
public descargar(clave): void {
this.descargarParametricas().subscribe(
parametros => {
// make process by key
Object.keys(parametros).forEach(
index => this.descargarParametrica(index, parametros[index]) : void(0)
);
}
);
}
public descargarParametrica( key: string, parametros: any[] ){
parametros.forEach( item => {
const headers = Object.keys(item);
const rows = Object.values(item).map( item => item === '' ? 'NULL' : item );
const sqlQuery = `INSERT INTO ${key}(${headers.join()}) VALUES (${rows.join()});`;
// execute query per loop is too slow, only countries data(200 records) affect performance and stop
this.datalayer.execute(sqlQuery);
})
}
this.descargarParametricas() return a JSON 40kb size, the problem is that the insertion process must be done by the key of the json and update if the row exist, actually have a performance issues because the insertion/update process execute row per row
thanks for all