diff --git a/WORKING.md b/WORKING.md
index a156e1e..6198b1c 100644
--- a/WORKING.md
+++ b/WORKING.md
@@ -34,3 +34,10 @@ Will show the scheduled jobs for today, each job can be described using `at -c <
 
 # Images
 Images are saved in the web server's directory, so you can access your received images at http://your.raspberry.pi.ip/, where `your.raspberry.pi.ip` is your Raspberry PI IP address.
+
+# Pruning
+Run `prune.sh` to delete old images. By default it deletes the 10 oldest images from the disk and the database. If you want to schedule this task, run
+
+```bash
+cat <(crontab -l) <(echo "1 0 * * * /home/pi/raspberry-noaa/prune.sh") | crontab -
+```
diff --git a/install.sh b/install.sh
index 5e59315..a78a0f8 100755
--- a/install.sh
+++ b/install.sh
@@ -184,7 +184,7 @@ log_running "Setting up Nginx..."
 sudo cp templates/nginx.cfg /etc/nginx/sites-enabled/default
 (
     sudo mkdir -p /var/www/wx/images
-    sudo chown -R www-data:www-data /var/www/wx
+    sudo chown -R pi:pi /var/www/wx
     sudo usermod -a -G www-data pi
     sudo chmod 775 /var/www/wx
 )
diff --git a/prune.sh b/prune.sh
index 31109c8..94433c9 100755
--- a/prune.sh
+++ b/prune.sh
@@ -4,7 +4,10 @@
 . "$HOME/.noaa.conf"
 . "$NOAA_HOME/common.sh"
 
-find "${NOAA_HOME}/map/" -type f -name '*.png' -mtime +1 -exec rm -f {} \;
-log "${NOAA_HOME}/map/ folder pruned" "INFO"
-find "${NOAA_OUTPUT}/audio/" -type f -name '*.wav' -mtime +1 -exec rm -f {} \;
-log "${NOAA_OUTPUT}/audio/ folder pruned" "INFO"
+for img_path in $(sqlite3 ${NOAA_HOME}/panel.db "select file_path from decoded_passes limit 10;"); do
+    find "${NOAA_OUTPUT}/images/" -type f -name "${IMG_NAME}*.jpg" -exec rm -f {} \;
+    find "${NOAA_OUTPUT}/images/thumb/" -type f -name "${IMG_NAME}*.jpg" -exec rm -f {} \;
+    log "${img_path} file pruned" "INFO"
+    sqlite3 "${NOAA_HOME}/panel.db" "delete from decoded_passes where file_path = \"$img_path\";"
+    log "Database entry pruned" "INFO"
+done