-- 03.sql: recipients for SMS alerts
-- Table to store phone numbers, enabled flag, and alert level (1=red only, 2=yellow+red)
-- PostgreSQL has no native unsigned int; use integer with CHECK constraints.
CREATE TABLE IF NOT EXISTS sms_recipients (
    phone        TEXT PRIMARY KEY,
    enabled      BOOLEAN NOT NULL DEFAULT TRUE,
    alert_level  INTEGER NOT NULL DEFAULT 2 CHECK (alert_level >= 1)
);