-- Migration 032: Per-recorder GPU affinity (Issue #167)
-- Adds a nullable GPU UUID to the recorders table so each recorder can be
-- pinned to a specific GPU on its node. The value is passed through to the
-- node-agent sidecar-start payload and becomes NVIDIA_VISIBLE_DEVICES for the
-- capture container. NULL = legacy behavior (NVIDIA_VISIBLE_DEVICES=all, i.e.
-- every GPU visible). Accepts an nvidia-smi GPU UUID (e.g. "GPU-xxxx") or a
-- numeric index string.

ALTER TABLE recorders
  ADD COLUMN IF NOT EXISTS gpu_uuid TEXT DEFAULT NULL;