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POST /api/v1/data/executions is owned by ChunkIngestionController (the legacy ExecutionController path is @ConditionalOnMissingBean(ChunkAccumulator) and never binds). The old RouteExecution-shaped seed was silently parsed as an empty ExecutionChunk and nothing landed in ClickHouse. Rewrote the seed as a single final ExecutionChunk with chunkSeq=0 / final=true and a flat processors[] carrying seq + parentSeq to preserve the 3-level tree (DetailService.buildTree reconstructs the nested shape for the API response). Execution-id lookup now goes through the search REST API filtered by correlationId, per the no-raw-SQL preference. Template for the other Cluster B ITs. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>