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This series allows creating multiple vector indexes on the same column so users can rebuild an index without losing query availability. The intended flow is: 1. Create a new vector index on a column that already has one. 2. Keep serving ANN queries from the old index while the new one is being built. 3. Verify the new index is ready. 4. Automatically switch to the remaining index. 5. Drop the old index. To make that deterministic, `index_version` is changed from the base table schema version to a real creation timeuuid. When multiple vector indexes exist on the same column, ANN query planning now picks the index according to the routing implemented in Vector Store (newest serving index). This keeps queries on the old index until it the new one is up and ready. This patch also removes the create-time restriction that rejected a second vector index on the same column. Name collisions are still rejected as before. Test coverage is updated accordingly: - Scylla now verifies that two vector indexes can coexist on the same column. - Cassandra/SAI behavior is still covered and is still expected to reject duplicate indexes on the same column. Fixes: VECTOR-610 Closes scylladb/scylladb#29407 * github.com:scylladb/scylladb: docs: document vector index metadata and duplicate handling test/cqlpy: cover vector index duplicate creation rules vector_index: allow multiple named indexes on one column vector_index: store `index_version` as creation timeuuid