Incremental RAG indexing without losing the old index

<p><em>Re-indexing is easy when the collection is small and nobody is using it. The harder problem is changing a live index while documents, parsers, embedding services, and vector storage can all fail at different points. The examples come from Project Pavilion, which indexes its project records into Qdrant on .NET 9.</em></p> <h2> Treat indexing as a state transition </h2> <p>An indexing job is

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