In-memory counter incremented every time a transaction is added to or removed from the mempool, used for external mempool tracking.
Declared in <txmempool.h>
[[guarded_by(0x7f95135d11f8), guarded_by(0x7f9501b105d8), guarded_by(0x7f950ec767c8), guarded_by(0x7f9525ea6518), guarded_by(0x7f9515095c58), guarded_by(0x7f9508269ef8), guarded_by(0x7f94f856d608), guarded_by(0x7f9513c577f8)]]
mutable
uint64_t m_sequence_number = {1};