transaction is not defined

 const transaction = await db.transaction() 

 TypeError: transaction is not a function 

const { drizzle } = require('drizzle-orm/node-postgres')
const { Client } = require('pg')
const { vehicles } = require('#schemas/vehicles.js')
const { technicianSchedules } = require('#schemas/technician_schedules.js')
const { stores } = require('#schemas/stores.js')
const { services } = require('#schemas/services.js')
const { technicians } = require('#schemas/technicians.js')
const { appointments } = require('#schemas/appointments.js')
const { zipcodes } = require('#schemas/zipcodes.js')
const { email_templates } = require('#schemas/email_templates.js')
const { emails } = require('#schemas/emails.js')
const { email_tracking } = require('#schemas/email_tracking.js')

const client = new Client({
    connectionString: process.env.DATABASE_URL,
    ssl: {
        rejectUnauthorized: false
    }
})

client.connect(null).then(() => console.log('The Database has been connected, successfully.'))

module.exports = {
    db: drizzle(client, {
        schema: {
            vehicles,
            technicianSchedules,
            stores,
            services,
            technicians,
            appointments,
            zipcodes,
            email_templates,
            emails,
            email_tracking
        }
    }),
    client
}