id
user_id
type
previous_amount
amount
current_amount

id, user_id, type, last_amount, amount, cur_amount
1,    10,     CR,     20.0,     10.0,    30.0
2,    11,     CR,     40.0,     15.0,    55.0
3,    10,     DR,     30.0,     5.0,     25.0
4,    12,     CR,     5.0,      20.0,    25.0
5,    11,     DR,     55.0,     10.0,    45.0

3,    10,     DR,     30.0,     5.0,     25.0
4,    12,     CR,     5.0,      20.0,    25.0
5,    11,     DR,     55.0,     10.0,    45.0