-- ==========================================
-- Chat Switchboard — 015 Tool Health
-- ==========================================
-- Health tracking for built-in tools (web_search, url_fetch, etc.).
-- ==========================================

CREATE TABLE IF NOT EXISTS tool_health (
    id              UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    tool_name       TEXT NOT NULL,
    window_start    TIMESTAMPTZ NOT NULL,
    request_count   INT NOT NULL DEFAULT 0,
    error_count     INT NOT NULL DEFAULT 0,
    total_latency_ms BIGINT NOT NULL DEFAULT 0,
    max_latency_ms  INT NOT NULL DEFAULT 0,
    last_error      TEXT,
    last_error_at   TIMESTAMPTZ,
    updated_at      TIMESTAMPTZ NOT NULL DEFAULT now(),

    UNIQUE (tool_name, window_start)
);

CREATE INDEX IF NOT EXISTS idx_tool_health_window
    ON tool_health (tool_name, window_start DESC);