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create table t (`user_id` int, `action_type` varchar(32), `value` int, `datetime` datetime);
insert into t values
(1, 'value_add', 20, '2022-12-31 10:00:00'),
(2, 'value_add', 50, '2022-12-31 11:00:00'),
(3, 'value_remove', 200, '2022-12-30 09:00:00'),
(3, 'value_remove', 250, '2022-12-30 14:00:00'),
(4, 'value_add', 300, '2022-12-30 15:00:00'),
(5, 'value_remove', 100, '2022-12-31 22:00:00');
select
date(`datetime`),
sum(case when `action_type` = 'value_add' then `value` else -`value` end) `total`
from t
group by date(`datetime`)
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