CREATE TABLE IF NOT EXISTS repo_ref (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    repo UUID NOT NULL REFERENCES repo(id),
    name TEXT NOT NULL,
    kind TEXT NOT NULL,
    target_sha TEXT NOT NULL,
    is_default BOOLEAN NOT NULL DEFAULT FALSE,
    is_protected BOOLEAN NOT NULL DEFAULT FALSE,
    created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
    updated_at TIMESTAMPTZ NOT NULL DEFAULT now()
);