If cmd poller is used, status_rec_date and staus_fail_date are around 1970-01-01 (@bmfmancini has 1969, I guess it is timezone/summer time).

New device, snmp works well, device is online:
+---------------------+---------------------+--------------------------------+--------+--------------------+------------------------+ | status_fail_date | status_rec_date | status_last_error | status | status_event_count | snmp_sysUpTimeInstance | +---------------------+---------------------+--------------------------------+--------+--------------------+------------------------+ | 0000-00-00 00:00:00 | 0000-00-00 00:00:00 | | 0 | 0 | 0 |

I change snmp port to simulate down state:
| 0000-00-00 00:00:00 | 0000-00-00 00:00:00 | Device did not respond to SNMP | 3 | 1 | 2271887200 |

after few minutes:
| 1970-01-01 01:33:44 | 0000-00-00 00:00:00 | Device did not respond to SNMP | 1 | 1 | 2271887200 |

after recovering:
| 1970-01-01 01:32:50 | 2024-04-14 18:50:00 | Device did not respond to SNMP | 3 | 0 | 2271923200 |

after next poller cycle:
| 1970-01-01 01:32:50 | 1970-01-01 01:33:44 | Device did not respond to SNMP | 3 | 0 | 2271929200 |

@bmfmancini confirmed it. With spine works fine