curl --request POST \
  --url 'https://api.flashcat.cloud/channel/silence/rule/create?app_key=' \
  --header 'Content-Type: application/json' \
  --data '
{
  "channel_id": 3521074710131,
  "rule_name": "Maintenance window silence",
  "description": "Silence all Info alerts during planned maintenance",
  "time_filter": {
    "start_time": 1773388800,
    "end_time": 1773414000
  },
  "filters": [
    [
      {
        "key": "severity",
        "oper": "IN",
        "vals": [
          "Info"
        ]
      }
    ]
  ],
  "is_directly_discard": false
}
'

{
  "request_id": "01HK8XQE3Z7JM2NTFQ5YJ8P9R4",
  "data": {
    "rule_id": "69db2f66a0fe7db6448b1503",
    "rule_name": "Test silence rule"
  }
}