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`system.client_routes` is a system table that sets the target address and ports for each `host_id`, for one or more connection (e.g., Private Link) represented by `connection_id`. Cloud will write the table via REST, and drivers will read it via CQL to override values obtained from `system.local` and `system.peers`. This patch series contains: - Introduction of `CLIENT_ROUTES` feature flag. - Implementation of raft-based `system.client_routes` table - Implementation of `v2/client-routes` POST/DELETE/GET endpoints - Implementation of new `CLIENT_ROUTES_CHANGE` event that is sent to drivers when `system.client_routes` is changed - New tests that verifies the aforementioned features Ref: scylladb/scylla-enterprise#5699 For now, no automatic backport. However, the changes are planned to be release on `2025.4` either as a backport or a private build. Closes scylladb/scylladb#27323 * https://github.com/scylladb/scylladb: docs: describe CLIENT_ROUTES_CHANGE extension test: add test for CLIENT_ROUTES event service: transport: add CLIENT_ROUTES_CHANGE event test: add cluster tests for client routes test: add API tests for client_routes endpoints test: add `timeout` parameter to `delete` in RESTClient test: allow json_body in send api: implement client_routes endpoints api: add client_routes.json service: main: add client_routes_service db: add system.client_routes table gms: add CLIENT_ROUTES feature