Method clearDatasetChunks

pj_datastore/src/engine.cpp:374–391

}

void DataEngine::clearDatasetChunks(DatasetId dataset_id) {
  // Like retireTopic, reclaim each topic's materialized chunks — but WITHOUT
  // adding the ids to retired_topic_ids, so they stay in listTopics() and a refill
  // writes back into them. For each live topic, clearChunks() empties the deque and
  // resets the eviction floor + cached min/max + row count, so a DataReader reports
  // an empty range immediately. Unknown dataset_id -> no-op; clearing an empty topic
  // is a no-op (idempotent).
  //
  // clearChunks() FREES the deque, so hold the engine lock across the whole sweep
  // (chunk-freeing mutation: GUI-thread-only, callers drop cached TopicChunk* first
  // — same contract as retireTopic/enforceRetention).
  auto lock = lockEngine();
  for (const TopicId topic_id : listTopicsLocked(dataset_id)) {
    if (TopicStorage* storage = getTopicStorage(topic_id)) {
      storage->clearChunks();
    }
  }
}

DataEngine::DatasetChunkSnapshot DataEngine::detachDatasetChunks(DatasetId dataset_id) {
  auto lock = lockEngine();