Get conversation outcome category / sub category counts over time, split into contiguous windows so the result can be rendered as a trend/bar chart.

The window size is derived from the requested period:

• ≤ 2 days → 6-hour windows

• ≤ 14 days → daily windows

• ≤ ~1 month → weekly windows

• > 1 month → monthly windows

• template: Outcome mapping template to bucket outcomes by.

• start / end: ISO 8601 range. end is exclusive; each window's end field is its last second (e.g. ...T23:59:59Z).

• timezone: IANA timezone the day/month/6-hour bars align to (local calendar); defaults to UTC. Weekly bars are always anchored to start.

• assistantIds: Optional, repeatable. Falls back to the template's saved assistantIds, then to all assistants.

Returns an empty list if the team has no outcome mapping configured yet, or if the given range is missing or empty.

{
  "message": "Stats fetched successfully."
}