-- GoChat Rate Limit State Table
-- Stores rate limit counters per client IP for sliding window enforcement.
-- Reference: Chatwoot Rack::Attack throttle configuration

CREATE TABLE IF NOT EXISTS rate_limit_states (
    id SERIAL PRIMARY KEY,
    key VARCHAR(255) NOT NULL UNIQUE,
    count INTEGER NOT NULL DEFAULT 0,
    window_start TIMESTAMP WITH TIME ZONE NOT NULL,
    expires_at TIMESTAMP WITH TIME ZONE NOT NULL,
    created_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
    updated_at TIMESTAMP WITH TIME ZONE DEFAULT NOW()
);

CREATE INDEX idx_rate_limit_states_key ON rate_limit_states(key);
CREATE INDEX idx_rate_limit_states_expires ON rate_limit_states(expires_at);