I am a have a database field

sys_period = Column(TSTZRANGE, nullable=False, index=True)

when I insert a value into it is ignored the field is assigned a current timestamp like seen bellow:

[2024-04-24 05:18:03.179910+02:00, None)

when I have actually set it up to be sys_period="[2018-10-01 00:00:00Z, 2018-10-31 23:59:59Z)"