some fixes again

data_acq_and_processing/preprocessing/data_preprocessor/src/data_preprocessor.cpp

@@ -149,6 +149,12 @@ void DataPreprocessor::run(const std::atomic<bool>& stop_requested) {
             const auto preprocessed_collection = preprocess_collection(raw_collection);
             publish_preprocessed_collection(preprocessed_collection);
         } catch (const std::exception& exc) {
+            // A ring-slot-too-small failure is a permanent config error (the slot
+            // cannot hold a serialized collection): swallowing it would silently
+            // drop every collection forever, so fail fast and let the operator fix it.
+            if (std::string(exc.what()).find("slot is too small") != std::string::npos) {
+                throw;
+            }
             // A single malformed or transiently-bad collection must not kill the
             // long-running preprocessor: drop it and keep serving the next sweep.
             // Logging is throttled so a persistent error cannot flood the log.