feat: enhance order handling in LighterGateway and introduce order identity normalization for improved precision and consistency

tests/lighter/order-feed.test.ts

@@ -0,0 +1,26 @@
+import { describe, expect, it } from "vitest";
+import { shouldResetMarketOrders } from "../../src/exchanges/lighter/order-feed";
+
+describe("shouldResetMarketOrders", () => {
+  it("always resets on snapshots", () => {
+    expect(shouldResetMarketOrders([{ id: 1 }], true)).toBe(true);
+    expect(shouldResetMarketOrders([], true)).toBe(true);
+    expect(shouldResetMarketOrders(null, true)).toBe(true);
+  });
+
+  it("resets when array bucket is empty", () => {
+    expect(shouldResetMarketOrders([], false)).toBe(true);
+    expect(shouldResetMarketOrders([{}], false)).toBe(false);
+  });
+
+  it("resets when object bucket has no keys", () => {
+    expect(shouldResetMarketOrders({}, false)).toBe(true);
+    expect(shouldResetMarketOrders({ a: 1 }, false)).toBe(false);
+  });
+
+  it("does not reset for non-empty updates", () => {
+    expect(shouldResetMarketOrders([{ order_index: "1" }], false)).toBe(false);
+    expect(shouldResetMarketOrders(null, false)).toBe(false);
+    expect(shouldResetMarketOrders(undefined, false)).toBe(false);
+  });
+});