nao consigo conectar minha api ao banco de dados

Boa noite amigos, alguem poderia me ajudar. to tentando criar uma api com typescript e typeorm e docker-compose mas não estou conseguindo conectar com o banco. meu arqui compose:

version: "3.3"
services:
  node-app:
    build: .
    ports:
      - "8080:8080"
    volumes:
      - ./:/app
      - /app/node_modules
    environment:
      - PORT=8080
      - DB_USERNAME=root
      - DB_PASSWORD=root
      - DB_NAME=project-fap
      - DB_HOST=db_fap
    container_name: app-fap
    restart: always
    depends_on:
      - db_fap

      
  db_fap:
    image: mysql
    ports:
      - "3309:3306"
    volumes:
      - datasource:/var/lib/database_fap
    environment:
      MYSQL_ROOT_PASSWORD: root
      MYSQL_DATABASE: project-fap
    container_name: database-fap

volumes: datasource:

meu arquivo data-source.ts:

import "dotenv/config";
import { DataSource } from "typeorm";

export const AppDataSource = new DataSource({
  type: "mysql",
  host: process.env.DB_HOST,
  port: 3309,
  username: process.env.DB_USERNAME,
  password: process.env.DB_PASSWORD,
  database: process.env.DB_NAME,
  logging: true,
  synchronize: false,
  entities: [],
  subscribers: [],
});

e o erro q estou recebendo no log:

app-node-ts@1.0.0 dev ts-node-dev 'src/index.ts'

[INFO] 01:31:22 ts-node-dev ver. 2.0.0 (using ts-node ver. 10.9.1, typescript ver. 5.2.2)
Server is running in port 8080
Error: connect ECONNREFUSED 172.29.0.2:3308
    at TCPConnectWrap.afterConnect [as oncomplete] (node:net:1555:16) {
  errno: -111,
  code: 'ECONNREFUSED',
  syscall: 'connect',
  address: '172.29.0.2',
  port: 3308,
  fatal: true

desde já muito grato.