Export executions as a CSV file (admin only).

Authentication: JWT token required Authorization: ADMIN or SUPERADMIN required

Query Parameters:

• date_field: Column to filter by (start_date or end_date)
• date_from: ISO 8601 start date (inclusive)
• date_to: ISO 8601 end date (inclusive)

Response: text/csv attachment named executions_export_<timestamp>.csv

Error Responses:

• 400 – invalid date_field
• 403 – insufficient privileges