CREATE TABLE runtime_usage (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    runtime_id UUID NOT NULL REFERENCES agent_runtime(id) ON DELETE CASCADE,
    date DATE NOT NULL,
    provider TEXT NOT NULL,
    model TEXT NOT NULL DEFAULT '',
    input_tokens BIGINT NOT NULL DEFAULT 0,
    output_tokens BIGINT NOT NULL DEFAULT 0,
    cache_read_tokens BIGINT NOT NULL DEFAULT 0,
    cache_write_tokens BIGINT NOT NULL DEFAULT 0,
    created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
    updated_at TIMESTAMPTZ NOT NULL DEFAULT now(),
    UNIQUE (runtime_id, date, provider, model)
);

CREATE INDEX idx_runtime_usage_runtime_date ON runtime_usage(runtime_id, date DESC);