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Addition of cdc column in scylla_tables changes how schema digests are calculated, and affect the ABI of schema update messages (adding a column changes other columns' indexes in frozen_mutation). To fix this, extend the schema_tables mechanism with support for the cdc column, and adjust schemas and mutations to remove that column when sending schemas during upgrade. Signed-off-by: Piotr Jastrzebski <piotr@scylladb.com>