ADD: New error code for slow reader catchup

Author: renan-databento

CHANGELOG.md

@@ -1,5 +1,9 @@
 # Changelog
 
+## 0.49.0 - TBD
+- Added `SkippedRecordsAfterSlowReading` to the `ErrorCode` enum for gateway errors originating
+  from slow client catch-up.
+
 ## 0.48.0 - 2026-02-18
 
 ### Enhancements

include/databento/enums.hpp

@@ -632,6 +632,9 @@ enum ErrorCode : std::uint8_t {
   InvalidSubscription = 5,
   // An error occurred in the gateway.
   InternalError = 6,
+  // A slow client was detected and records were skipped by the gateway to allow
+  // catching up.
+  SkippedRecordsAfterSlowReading = 7,
   // No error code was specified or this record was upgraded from a version 1 struct
   // where the code field didn't exist.
   Unset = 255,

src/enums.cpp

@@ -802,6 +802,9 @@ const char* ToString(ErrorCode error_code) {
     case ErrorCode::InternalError: {
       return "internal_error";
     }
+    case ErrorCode::SkippedRecordsAfterSlowReading: {
+      return "skipped_records_after_slow_reading";
+    }
     case ErrorCode::Unset: {
       return "unset";
     }
@@ -1256,6 +1259,9 @@ ErrorCode FromString(const std::string& str) {
   if (str == "internal_error") {
     return ErrorCode::InternalError;
   }
+  if (str == "skipped_records_after_slow_reading") {
+    return ErrorCode::SkippedRecordsAfterSlowReading;
+  }
   if (str == "unset") {
     return ErrorCode::Unset;
   }