Freeze Swapter pagination upper time bound

Compute timeTo once before the paging loop instead of per request, so orders
arriving mid-walk cannot shift the window and page boundaries and skip or
duplicate rows before completion is decided.

Author: j0ntz

src/partners/swapter.ts

@@ -135,6 +135,11 @@ export const querySwapter = async (
   let previousTimestamp = new Date(latestIsoDate).getTime() - QUERY_LOOKBACK
   if (previousTimestamp < 0) previousTimestamp = 0
 
+  // Freeze the upper time bound for the whole pagination walk. Recomputing
+  // Date.now() per page would shift the window and page boundaries if orders
+  // arrive mid-walk, which can skip or duplicate rows before completion.
+  const queryTimeTo = Date.now()
+
   let page = 1
   let retry = 0
 
@@ -152,7 +157,7 @@ export const querySwapter = async (
             page,
             items: LIMIT,
             timeFrom: previousTimestamp,
-            timeTo: Date.now()
+            timeTo: queryTimeTo
           })
         }
       )