diff --git a/mattermost-retention.sh b/mattermost-retention.sh
new file mode 100644
index 0000000..e8a327a
--- /dev/null
+++ b/mattermost-retention.sh
@@ -0,0 +1,39 @@
+#!/bin/bash
+
+# configure vars
+
+DB_USER="mmuser"
+DB_NAME="mattermost"
+DB_PASS=""
+DB_HOST="db"
+RETENTION="0"
+DATA_PATH="/mattermost/data/"
+
+# calculate epoch in milisec
+delete_before=$(date  --date="$RETENTION day ago"  "+%s%3N")
+#delete_before=$(date  "+%s%3N")
+echo $(date  --date="$RETENTION day ago")
+# run psql command do delete posts older than RETENTION var
+export PGPASSWORD=$DB_PASS
+
+# get list of files to be removed
+psql -h "$DB_HOST" -U"$DB_USER" "$DB_NAME" -t -c "select path from fileinfo where createat < $delete_before;" > /tmp/mattermost-paths.list
+psql -h "$DB_HOST" -U"$DB_USER" "$DB_NAME" -t -c "select thumbnailpath from fileinfo where createat < $delete_before;" >> /tmp/mattermost-paths.list
+psql -h "$DB_HOST" -U"$DB_USER" "$DB_NAME" -t -c "select previewpath from fileinfo where createat < $delete_before;" >> /tmp/mattermost-paths.list
+
+# cleanup db 
+psql -h "$DB_HOST" -U"$DB_USER" "$DB_NAME" -t -c "delete from posts where createat < $delete_before;"
+psql -h "$DB_HOST" -U"$DB_USER" "$DB_NAME" -t -c "delete from fileinfo where createat < $delete_before;"
+
+# delete files
+while read -r fp; do
+        if [ -n "$fp" ]; then
+                echo "$DATA_PATH""$fp"
+                shred -u "$DATA_PATH""$fp"
+        fi
+done < /tmp/mattermost-paths.list
+
+#cleanup after yourself
+rm /tmp/mattermost-paths.list
+exit 0
+