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We make CDC_GENERATIONS_V3 single-partition by adding the key column and changing the clustering key from range_end to (id, range_end). This is the first step to enabling the efficient clearing of obsolete CDC generation data, which we need to prevent Raft-topology snapshots from endlessly growing as we introduce new generations over time. The next step is to change the type of the id column to timeuuid. We do it in the following commits. After making CDC_GENERATIONS_V3 single-partition, there is no easy way of preserving the num_ranges column. As it is used only for sanity checking, we remove it to simplify the implementation.