#!/bin/sh
# Prune old backup files according to retention policy.
# daily: keep 14  weekly: keep 8  monthly: keep 6
set -eu

prune() {
    local dir="$1"
    local keep="$2"
    [ -d "$dir" ] || return 0
    # Files are YYYY-MM-DD.dump; lexicographic sort = chronological.
    # tail skips the N newest; xargs deletes the rest.
    ls -1 "$dir"/*.dump 2>/dev/null \
        | sort \
        | head -n "-$keep" \
        | xargs -r rm -f --
}

for db in famapp authentik; do
    prune "/backups/$db/daily"   14
    prune "/backups/$db/weekly"   8
    prune "/backups/$db/monthly"  6
done

echo "[retain] done"