-- ==========================================
-- Chat Switchboard — 020 Multi-Replica HA
-- ==========================================
-- Shared state tables for multi-replica operation.
-- v0.32.0: ws_tickets, rate_limit_counters.
-- ==========================================

-- =========================================
-- WEBSOCKET TICKETS (replaces in-memory sync.Map)
-- =========================================
-- Short-lived, single-use tokens for WebSocket authentication.
-- Ticket issued on pod-1 must validate on pod-2.

CREATE TABLE IF NOT EXISTS ws_tickets (
    id         TEXT PRIMARY KEY,
    user_id    UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    expires_at TIMESTAMPTZ NOT NULL
);

CREATE INDEX IF NOT EXISTS idx_ws_tickets_expires
    ON ws_tickets (expires_at);

-- =========================================
-- RATE LIMIT COUNTERS (replaces in-memory token bucket)
-- =========================================
-- Fixed-window counters keyed by scope:identifier and time bucket.
-- Key format: "{scope}:{identifier}" e.g. "auth:192.168.1.1"

CREATE TABLE IF NOT EXISTS rate_limit_counters (
    key          TEXT NOT NULL,
    window_start TIMESTAMPTZ NOT NULL,
    tokens       REAL NOT NULL DEFAULT 0,
    PRIMARY KEY (key, window_start)
);

CREATE INDEX IF NOT EXISTS idx_rate_limit_counters_window
    ON rate_limit_counters (window_start);