feat(db): migration 032 — auth_users.email_verified (beta-grant gating)

db/migrations/032_auth_users_email_verified.sql

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+-- Migration 032: auth_users.email_verified — prove email ownership before a
+-- beta/premium slot can be claimed.
+--
+-- The "first 500 free Full Moon" grant in ensure_profile() (api/main.py) fires
+-- for any authenticated account. Password signup (api/auth.py) creates an
+-- account with no email verification, so one person can farm slots with
+-- disposable emails. This column lets the grant require a verified email.
+-- Magic-link and Google OAuth prove ownership by construction and set this TRUE
+-- at account creation; password accounts start FALSE and flip TRUE on verify.
+--
+-- Backfill without revocation: every account that predates this migration was
+-- created under the prior rules and keeps its standing (including any
+-- is_beta = TRUE grant). We do this by adding the column with default TRUE
+-- (Postgres fills all existing rows), then flipping the default to FALSE so
+-- only NEW rows must earn verification.
+--
+-- Idempotent: `add column if not exists` is a no-op on re-run (it never touches
+-- existing data once the column exists), and `set default false` is a no-op.
+-- A re-run therefore never clobbers a legitimately-unverified newer account.
+
+alter table public.auth_users
+  add column if not exists email_verified boolean not null default true;
+
+alter table public.auth_users
+  alter column email_verified set default false;