-- Per-workspace default placement: where new agent sandboxes provision. A fleet
-- node id runs agents on that connected node; absent (or 'local') = the gateway
-- host, as before. Falls back to 'local' at runtime if the node is offline.
CREATE TABLE workspace_placement (
    workspace_id UUID PRIMARY KEY REFERENCES workspaces (id) ON DELETE CASCADE,
    node_id      TEXT NOT NULL,
    updated_at   TIMESTAMPTZ NOT NULL DEFAULT now()
);