EOS 插入数据的RAM消耗

context.add_ram_usage(
	l.account,
	(int64_t)(config::billable_size_v<permission_link_object>)
);

https://github.com/EOSIO/eos/blob/3fddb727b8f3615917707281dfd3dd3cc5d3d66d/libraries/chain/eosio_contract.cpp#L340