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_create_link_from_topology_data now restores traffic-insight markers (mirroring how filters are restored via update_filters), so markers — including their color — survive project close/reopen and server restart. Guard start_marker's uBridge POST with 'if self._created' (exactly as update_filters guards its update() call): during project load the link is not yet created, so only _markers state is recorded and the marker is applied once via the NIO flow in create()/_ubridge_apply_markers — no double application.