diff --git a/util/src/util/Constants.ts b/util/src/util/Constants.ts
index 8d61b9b4..9ceebf30 100644
--- a/util/src/util/Constants.ts
+++ b/util/src/util/Constants.ts
@@ -742,6 +742,8 @@ export const FosscordApiErrors = {
DELETE_MESSAGE_DISABLED: new ApiError("You are not allowed to delete your own messages", 25061),
FEATURE_PERMANENTLY_DISABLED: new ApiError("This feature has been disabled server-side", 45006),
MISSING_RIGHTS: new ApiError("You lack rights to perform that action ({})", 50013, undefined, [""]),
+ CANNOT_REPLACE_BY_BACKFILL: new APIError("Cannot backfill to message ID that already exists", 55002),
+ CANNOT_BACKFILL_TO_THE_FUTURE: new APIError("You cannot backfill messages in the future", 55003),
CANNOT_GRANT_PERMISSIONS_EXCEEDING_RIGHTS: new ApiError("You cannot grant permissions exceeding your own rights", 50050),
ROUTES_LOOPING: new ApiError("Loops in the route definition ({})", 50060, undefined, [""]),
CANNOT_REMOVE_ROUTE: new ApiError("Cannot remove message route while it is in effect and being used", 50061),
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