Reset Demo Account State

### Reset one or more demo accounts to their state at a previous trade date. **Available to:** All authenticated users **Environments:** Demo **[Rate Limit](/api/authentication#request-rate-limits-and-time-penalties):** No endpoint-specific limit Returns the specified simulation accounts to their state as of market open on a given trade date, discarding the activity that occurred after that date. Use this to roll a practice account back to a known starting point — for example, to restart an evaluation phase or clear out test trades. Provide the accounts to reset in `accountIds` (an array of integer account entity IDs) and the target date in `resetTradeDate`. Look up account IDs with the [`accountList`](/api/rest-api-endpoints/accounting/account-list) endpoint. The response is a `SimpleResponse`; check its `ok` flag and `errorText` field to confirm the reset. This endpoint is available on Demo only. Resetting an account's state cannot be undone. **Common Failure Scenarios** - An entry in `accountIds` doesn't exist or isn't owned by the calling user. - `resetTradeDate` is missing or not a valid trade date. - The access token is missing or invalid (returns `HTTP 401`). **Error Messages** | `errorText` | Trigger | |-------------|---------| | Non-empty `errorText` | The request failed; the field describes the reason. |