Docker react-flask-app_server_1 exited with code 0 / err 111 conn to db

Question

I have this issue when switching from flask to fast api. My docker server wont stay up. I believe it cannot connect to the db. Err. 111. However there are no logs when I use db:3306. It's sucking down my time and I don't know what the heck the problem is.

docker-compose.yml

version: '3.8'
services: 
  db:
    command: '--default-authentication-plugin=mysql_native_password'
    environment:
      - MYSQL_DATABASE=investing
      - MYSQL_ROOT_PASSWORD=777
    image: mysql:8.0.28
    ports: [3306]
    restart: on-failure
    volumes: 
      - "./db/init:/docker-entrypoint-initdb.d"
    # healthcheck:
    #   test: mysqladmin ping -h 127.0.0.1 -u $$MYSQL_USER --password=$$MYSQL_PASSWORD


  # client:
  #   build: client
  #   ports: [3000]
  #   restart: always

  server:
    build: server
    ports: 
      - "5000:5000"
    restart: always
    depends_on:
      - db
    volumes:
      - ./server:/tmp
      - ./server/data:/tmp/data

database.py

from sqlalchemy import create_engine  # type: ignore
from sqlalchemy.orm import declarative_base, sessionmaker  # type: ignore

SQLALCHEMY_DATABASE_URI = "mysql+pymysql://root:777@db:3306/investing"

engine = create_engine(SQLALCHEMY_DATABASE_URI)
SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
Base = declarative_base()