-- Hardware-only preview snapshots; no accounting status or invoice amount updates.
CREATE TABLE IF NOT EXISTS hardware_intake_previews (
    id UUID PRIMARY KEY,
    source_kind VARCHAR(20) NOT NULL CHECK(source_kind IN ('invoice','file')),
    source_id BIGINT NOT NULL,
    payload JSONB NOT NULL,
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
);
CREATE UNIQUE INDEX IF NOT EXISTS uq_hardware_intake_unit
ON hardware_assets ((hardware_specs->>'intake_unit_key'))
WHERE hardware_specs->>'intake_unit_key' IS NOT NULL;