{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "type": "object",
  "additionalProperties": false,
  "required": ["period"],
  "properties": {
    "period": { "enum": ["day", "week", "month", "custom"] },
    "date_from": { "type": "string", "format": "date" },
    "date_to": { "type": "string", "format": "date" }
  }
}