-- Optional server-plane extension tables

CREATE TABLE IF NOT EXISTS command_dispatches (
    id uuid PRIMARY KEY DEFAULT uuid_generate_v4(),
    tenant_id uuid NOT NULL REFERENCES tenants(id) ON DELETE CASCADE,
    job_id uuid NOT NULL REFERENCES jobs(id) ON DELETE CASCADE,
    server_id uuid NOT NULL REFERENCES servers(id) ON DELETE CASCADE,
    command_type varchar(64) NOT NULL,
    idempotency_key varchar(120) NOT NULL,
    status varchar(32) NOT NULL DEFAULT 'queued',
    queued_at timestamptz NOT NULL DEFAULT now(),
    dispatched_at timestamptz NULL,
    acked_at timestamptz NULL,
    finished_at timestamptz NULL,
    created_at timestamptz NOT NULL DEFAULT now(),
    updated_at timestamptz NOT NULL DEFAULT now(),
    UNIQUE (tenant_id, idempotency_key)
);

CREATE TABLE IF NOT EXISTS agent_heartbeats (
    id bigserial PRIMARY KEY,
    tenant_id uuid NOT NULL REFERENCES tenants(id) ON DELETE CASCADE,
    server_id uuid NOT NULL REFERENCES servers(id) ON DELETE CASCADE,
    agent_uid varchar(128) NOT NULL,
    payload jsonb NOT NULL DEFAULT '{}'::jsonb,
    created_at timestamptz NOT NULL DEFAULT now()
);

CREATE INDEX IF NOT EXISTS idx_agent_heartbeats_server_created
    ON agent_heartbeats (server_id, created_at DESC);