new changes

architecture/2026/14-server-plane-schema-additions.sql

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+-- 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);