feat: verify scheduled backups

scripts/backup.sh

@@ -2,6 +2,7 @@
 set -euo pipefail
 
 # Creates a consistent SQLite backup through the running web container, then archives Hub uploads.
+# Optional: BACKUP_RETENTION_DAYS=30 BACKUP_OFFSITE_DIR=/mnt/backup/mebbling ./scripts/backup.sh
 root_dir="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
 cd "$root_dir"
 stamp="$(date +%Y%m%d-%H%M%S)"
@@ -15,4 +16,21 @@ docker compose exec -T -e BACKUP_PATH="/app/data/backups/$stamp/hub.db" web node
 '
 
 tar -czf "$backup_dir/uploads.tar.gz" -C public uploads
-printf 'Created backup: %s\n' "$backup_dir"
+
+docker compose exec -T -e BACKUP_PATH="/app/data/backups/$stamp/hub.db" web node -e '
+  const Database = require("better-sqlite3"); const db = new Database(process.env.BACKUP_PATH, { readonly: true });
+  const row = db.prepare("PRAGMA integrity_check").get(); db.close(); if (row.integrity_check !== "ok") { console.error("SQLite integrity check failed"); process.exit(1); }
+'
+tar -tzf "$backup_dir/uploads.tar.gz" >/dev/null
+(cd "$backup_dir" && sha256sum hub.db uploads.tar.gz > SHA256SUMS)
+
+if [[ -n "${BACKUP_OFFSITE_DIR:-}" ]]; then
+  destination="$BACKUP_OFFSITE_DIR/$stamp"; mkdir -p "$destination"
+  cp -a "$backup_dir/." "$destination/"
+  printf 'Copied verified backup to: %s\n' "$destination"
+fi
+if [[ -n "${BACKUP_RETENTION_DAYS:-}" ]]; then
+  [[ "$BACKUP_RETENTION_DAYS" =~ ^[0-9]+$ ]] || { echo "BACKUP_RETENTION_DAYS must be a non-negative integer" >&2; exit 2; }
+  find data/backups -mindepth 1 -maxdepth 1 -type d -mtime "+$BACKUP_RETENTION_DAYS" -exec rm -rf {} +
+fi
+printf 'Created and verified backup: %s\n' "$backup_dir"