Your Post/payload string is wrong. It should be: { "ai_dump":&JSON, "Image":"&ALERT_JPEG", "camera":"&CAM", "ALERT_PATH": "&ALERT_PATH", "ALERT_CLIP": "&ALERT_CLIP", "timestamp":"&ALERT_TIME" }
Hmmm.... it looks like your containers are running. If you click on where it says app-1 and db-1 it should open up a window with six diagnostic tabs. I would look through the logs and stats tabs to see if there is anything that stands out and gives you an indication of what could be wrong.
Try entering 192.168.68.111:3000/update into a browser and follow the migration process.
Edit: This assumes you have downloaded the migration file and put into the same folder as your docker compose file.