function check_and_fix_IOS_10_3_upgrade_issue () {
    return (somehowCheckIfWeNeedToDoThis) ?
        recreateDatabase() : Promise.resolve();
}

function recreateDatabase () {
    copyDatabase("dbName", "dbName_tmp").then(()=>{
        return Dexie.delete("dbName");
    }).then(()=>{
        return copyDatabase("dbName_tmp", "dbName");
    }).then(()=>{
        return Dexie.delete("dbName_tmp");
    }).catch(err => {
        console.error (err);
    })
}

function copyDatabase(fromDbName, toDbName) {
    return new Dexie(fromDbName).open().then(db => {
        let schema = db.tables.reduce((schema, table) => {
            schema[table.name] = [table.schema.primKey.src]
                .concat(table.schema.indexes.map(idx => idx.src))
                .join(',');
        }, {});

        let dbCopy = new Dexie(toDbName);
        dbCopy.version(db.verno).stores(schema);

        return dbCopy.open().then(()=>{
            // dbCopy is now successfully created with same version and schema as source db.
            // Now also copy the data
            return Promise.all(
                db.tables.map(table =>
                    table.toArray().then(rows => dbCopy.table(table.name).bulkAdd(rows))));
        });
    })
}