batch add students: add optional group selection in batch modal

scripts/backup.sh

@@ -0,0 +1,22 @@
+#!/usr/bin/env bash
+# Создаёт архив переноса: БД (dump) + фотографии (uploads).
+# Использование: ./scripts/backup.sh
+set -euo pipefail
+cd "$(dirname "$0")/.."
+
+STAMP=$(date +%Y%m%d-%H%M%S)
+mkdir -p backups
+
+echo ">> Экспорт БД"
+docker compose exec -T db pg_dump -U app -d whereldo | gzip > backups/db.sql.gz
+
+echo ">> Копирование фотографий"
+rm -rf backups/_uploads
+mkdir -p backups/_uploads
+docker cp "whatido-app-1:/app/uploads/." "backups/_uploads/"
+
+echo ">> Сборка архива"
+tar -czf "backups/whatido-backup-$STAMP.tar.gz" -C backups db.sql.gz _uploads
+rm -rf backups/_uploads backups/db.sql.gz
+
+echo "Готово: backups/whatido-backup-$STAMP.tar.gz"