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Error message

refresh: Invalid cron expression '{expression}': {detail}

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When this error occurs

When refresh.trigger is "cron", the cron_expression field must contain a valid 5-field cron expression. This error is raised when the expression cannot be parsed.

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Example: request that triggers this error

{
  "defaults": {
    "enabled_stats": ["value_count"]
  },
  "refresh": {
    "trigger": "cron",
    "cron_expression": "not a cron"
  }
}

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Cron expression format

┌───────────── minute (0–59)
│ ┌───────────── hour (0–23)
│ │ ┌───────────── day of month (1–31)
│ │ │ ┌───────────── month (1–12)
│ │ │ │ ┌───────────── day of week (0–7, 0 and 7 = Sunday)
│ │ │ │ │
* * * * *
Supported syntax: *, ,, -, /, ?, L, W, LW, #, and nicknames (@daily, @hourly, etc.). All times are UTC.

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How to fix

Provide a valid cron expression: 
{
  "defaults": {
    "enabled_stats": ["value_count"]
  },
  "refresh": {
    "trigger": "cron",
    "cron_expression": "0 0 * * *"
  }
}
Common examples:
ExpressionMeaning
0 0 * * *Every day at midnight UTC
0 3 * * 1Every Monday at 03:00 UTC
*/15 * * * *Every 15 minutes
0 0 1 * *First day of every month at midnight
0 6 * * 1-5Weekdays at 06:00 UTC
If you don’t need scheduled refresh, consider "trigger": "on_update" or "trigger": "manual" instead.