#define db_id_t uint64_t
#define db_type_id_t uint16_t
#define db_ordinal_t uint32_t
#define db_id_mask UINT64_MAX
#define db_type_id_mask UINT16_MAX
#define db_name_len_t uint8_t
#define db_name_len_max UINT8_MAX
#define db_fields_len_t uint8_t
#define db_indices_len_t uint8_t
#define db_count_t uint32_t
#define db_batch_len 100