Script to clear completed torrents from Transmission by location and ratio to use with Docker container https://hub.docker.com/r/linuxserver/transmission/. Place "remove-completed-torrent.sh" to "/config", and "add-cron-job.sh" to "/config/custom-cont-init.d".

add-cron-job.sh

#!/bin/bash

if [ -z "$(crontab -l | grep 'remove-completed-torrent.sh')" ]; then
    crontab -l | { cat; echo "0 3 * * * /config/remove-completed-torrent.sh 2>&1"; } | crontab -
fi

remove-completed-torrent.sh

#!/usr/bin/with-contenv bash

LOCATION="/downloads/movies"
MAX_RATIO=5

# use transmission-remote to get torrent list
TORRENTLIST=`transmission-remote --auth $USER:$PASS --list | sed -e '1d' -e '$d' | awk '{print $1}' | sed -e 's/[^0-9]*//g'`

# for each torrent in the list
for TORRENTID in $TORRENTLIST
do
    INFO=$(transmission-remote --auth $USER:$PASS --torrent $TORRENTID --info)

    IS_MOVIE=`echo $INFO | grep "Location: $LOCATION"`
    if [ -z "$IS_MOVIE" ]; then
        continue
    fi

    echo -e "Processing #$TORRENTID - $(echo $INFO | sed -e 's/.*Name: \(.*\) Hash.*/\1/')"

    # get torrent ratio
    RATIO=`echo $INFO | grep -Eo "Ratio: \d+" | cut -d: -f2 | tr -d [:space:]`

    # check if torrent download is completed
    DL_COMPLETED=`echo $INFO | grep "Done: 100%"`

    # check torrents current state is
    STATE_STOPPED=`echo $INFO | grep "State: Seeding\|State: Stopped\|State: Finished\|State: Idle"`

    # if the torrent is "Stopped", "Finished", or "Idle after downloading 100%"
    if [ "$RATIO" -gt "$MAX_RATIO" ] && [ "$DL_COMPLETED" ] && [ "$STATE_STOPPED" ]; then
        echo "Torrent #$TORRENTID is completed. Removing torrent and delete local data."
        transmission-remote --auth $USER:$PASS --torrent $TORRENTID --remove-and-delete
    else
        echo "Torrent #$TORRENTID is not completed. Ignoring."
    fi
done