## 1. Cleanup Script

- [x] 1.1 Create `cleanup-recordings.sh` in the repo with configurable size threshold (default 3k), `-mmin +1` safety guard, targeting `/recordings`
- [x] 1.2 Make the script executable and add a usage comment at the top

## 2. Docker Compose

- [x] 2.1 Update `cleanup-recordings.sh` to run as a loop with sleep instead of one-shot, read threshold from `SIZE_THRESHOLD` env var
- [x] 2.2 Add `sdr-cleanup` service to `docker-compose.yml` using `alpine` image, mounting the recordings volume and running the script

## 3. Deployment Cleanup

- [x] 3.1 Remove the host crontab entry installed earlier on `sdr-pi`
- [x] 3.2 Remove the script copy from `/home/m/cleanup-recordings.sh` on `sdr-pi`

## 4. Verification

- [x] 4.1 Deploy updated docker-compose to `sdr-pi` and confirm the cleanup container starts and deletes small files