fix(lab-04): align storage lab with compose workflow

labs/lab-04-storage/tests/99-final-verification.sh

@@ -5,25 +5,43 @@ cd "$(dirname "$0")/.."
 pass=0; fail=0
 check() { if eval "$1"; then echo "✓ $2"; ((pass++)); else echo "✗ $2"; ((fail++)); fi; }
 
+cleanup() {
+  docker compose down >/dev/null 2>&1 || true
+}
+
+trap cleanup EXIT
+
 # Infrastructure checks
 check "[[ -f docker-compose.yml ]]" "docker-compose.yml exists"
 check "docker compose config &>/dev/null" "Syntax valid"
 
 # Start services
+docker compose down >/dev/null 2>&1 || true
 docker compose up -d && sleep 8
 
 # Volume checks
-VOLUMES=$(docker volume ls --format '{{.Name}}' | grep -E "lab04|minio-data|db-data|test-data" | wc -l)
-check "[[ $VOLUMES -ge 3 ]]" "Named volumes created ($VOLUMES)"
+VOLUMES=$(docker volume ls --format '{{.Name}}' | grep -E '^lab-04-storage_(minio-data|db-data|test-data)$' | wc -l)
+check "[[ $VOLUMES -eq 3 ]]" "Named volumes created ($VOLUMES/3)"
 
 # MinIO checks
 check "curl -sf http://127.0.0.1:9000/minio/health/live" "MinIO API accessible"
 check "curl -sf http://127.0.0.1:9001 &>/dev/null" "MinIO console accessible"
 
-# Persistence check
+# Persistence check - test volume
 docker exec lab04-test sh -c "echo test > /test/file.txt"
 docker compose restart test && sleep 3
 check "docker exec lab04-test cat /test/file.txt | grep -q test" "Data persists after restart"
 
+# Persistence check - MinIO data volume
+docker exec lab04-minio sh -c "mkdir -p /data/tbf && echo ok > /data/tbf/probe.txt"
+docker compose restart minio && sleep 5
+check "docker exec lab04-minio sh -c 'cat /data/tbf/probe.txt' | grep -q ok" "MinIO data persists after restart"
+
+# Persistence check - PostgreSQL data volume
+docker exec lab04-db sh -c "psql -U lab04_user -d lab04_db -c \"create table if not exists tbf_probe(msg text); insert into tbf_probe values ('ok');\"" >/dev/null
+docker compose restart db && sleep 5
+DB_COUNT=$(docker exec lab04-db sh -c "psql -U lab04_user -d lab04_db -tAc \"select count(*) from tbf_probe where msg='ok';\"" | tr -d '[:space:]')
+check "test ${DB_COUNT:-0} -ge 1" "Database data persists after restart"
+
 echo "Passed: $pass, Failed: $fail"
 [[ $fail -eq 0 ]] && exit 0 || exit 1