-- Fleet: user-connected local-hardware nodes. Each node runs the clawmates-node
-- daemon, which dials home over an outbound control channel to report host health
-- and accept workload-placement commands. (Phase 2 of the multi-node node-pool;
-- agent_containers.node_id references the chosen node, 'local' by default.)
CREATE TABLE nodes (
    id            UUID PRIMARY KEY,
    workspace_id  UUID NOT NULL REFERENCES workspaces (id) ON DELETE CASCADE,
    name          TEXT NOT NULL,
    status        TEXT NOT NULL DEFAULT 'pending',   -- pending | online | offline | draining
    token         TEXT NOT NULL UNIQUE,              -- shared secret the daemon presents on the channel
    agent_version TEXT,
    tailscale_ip  TEXT,
    last_seen     TIMESTAMPTZ,
    created_at    TIMESTAMPTZ NOT NULL DEFAULT now()
);
CREATE INDEX nodes_workspace_idx ON nodes (workspace_id);

-- Latest host-health snapshot per node (upserted by the daemon heartbeat).
CREATE TABLE node_health (
    node_id         UUID PRIMARY KEY REFERENCES nodes (id) ON DELETE CASCADE,
    captured_at     TIMESTAMPTZ NOT NULL DEFAULT now(),
    cpu_pct         DOUBLE PRECISION NOT NULL DEFAULT 0,   -- 0..100
    mem_total       BIGINT NOT NULL DEFAULT 0,             -- bytes
    mem_used        BIGINT NOT NULL DEFAULT 0,
    mem_pressure    DOUBLE PRECISION NOT NULL DEFAULT 0,   -- 0..1 (used/total, or PSI if available)
    swap_used       BIGINT NOT NULL DEFAULT 0,
    disk_total      BIGINT NOT NULL DEFAULT 0,
    disk_free       BIGINT NOT NULL DEFAULT 0,
    load1           DOUBLE PRECISION NOT NULL DEFAULT 0,
    load5           DOUBLE PRECISION NOT NULL DEFAULT 0,
    load15          DOUBLE PRECISION NOT NULL DEFAULT 0,
    container_count INTEGER NOT NULL DEFAULT 0
);

-- Placement lookups (which containers run on which node, per workspace).
CREATE INDEX agent_containers_node_idx ON agent_containers (node_id, workspace_id);