-- 043: SMS delivery logs table (audit trail)
CREATE TABLE IF NOT EXISTS sms_logs (
    id BIGSERIAL PRIMARY KEY,
    user_id UUID REFERENCES users(id) ON DELETE SET NULL,
    phone VARCHAR(20) NOT NULL,
    type VARCHAR(20) NOT NULL CHECK (type IN ('REGISTER', 'LOGIN', 'RESET_PASSWORD', 'CHANGE_PHONE')),
    status VARCHAR(20) NOT NULL DEFAULT 'PENDING' CHECK (status IN ('PENDING', 'SENT', 'DELIVERED', 'FAILED')),
    provider VARCHAR(50),
    provider_id VARCHAR(100),
    error_msg TEXT,
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

CREATE INDEX idx_sms_logs_phone ON sms_logs(phone);
CREATE INDEX idx_sms_logs_created ON sms_logs(created_at);