From ccf61d734f00c66c429bfd3cb338ba955b2021aa Mon Sep 17 00:00:00 2001
From: Centaur AI <ai@centaur.local>
Date: Mon, 4 May 2026 15:27:45 +0000
Subject: [PATCH] feat(IStablecoinDEX): add OrderFlipped event per TIP-1056

TIP-1056 keeps the same orderId across flip order transitions.
Adds the OrderFlipped event with the same payload shape as
OrderPlaced, emitted when a fully filled flip order is rewritten
to its new resting state instead of allocating a new orderId.

Amp-Thread-ID: https://ampcode.com/threads/T-019df387-7b93-72d9-8a24-ac66bd58d568
---
 src/interfaces/IStablecoinDEX.sol | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/src/interfaces/IStablecoinDEX.sol b/src/interfaces/IStablecoinDEX.sol
index b4fdd31..344e86a 100644
--- a/src/interfaces/IStablecoinDEX.sol
+++ b/src/interfaces/IStablecoinDEX.sol
@@ -63,6 +63,16 @@ interface IStablecoinDEX {
     event OrderFilled(
         uint128 indexed orderId, address indexed maker, address indexed taker, uint128 amountFilled, bool partialFill
     );
+    event OrderFlipped(
+        uint128 indexed orderId,
+        address indexed maker,
+        address indexed token,
+        uint128 amount,
+        bool isBid,
+        int16 tick,
+        bool isFlipOrder,
+        int16 flipTick
+    );
     event OrderPlaced(
         uint128 indexed orderId,
         address indexed maker,