provide a way to run app

internal/store/pg/store.go

@@ -34,18 +34,23 @@ func (r *repository) StatsRepository() statsRepository {
 	}
 }
 
+func (r *repository) Close() error {
+	r.db.Close()
+	return nil
+}
+
 type statsRepository struct {
 	db *pgxpool.Pool
 }
 
 type deviceStatsDB struct {
+	UpdatedAt       time.Time
 	DeviceID        string
 	IncomingTraffic int
 	OutgoingTraffic int
 	IncomingRPS     int
 	ReadRPS         int
 	WriteRPS        int
-	UpdatedAt       time.Time
 }
 
 func (s deviceStatsDB) asDomain() entities.DeviceStatistics {