Keep legacy subscription tables as unmanaged instead of dropping them

prisma/migrations/20260910160000_retain_legacy_subscription/migration.sql

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+-- Retain the legacy subscription artifacts as externally managed data.
+--
+-- SubscriptionLevel and ProclamationCategorySubscriptionLevel are no longer
+-- modeled by the application. They are declared as external tables in
+-- prisma.config.ts so Prisma Migrate ignores them entirely and never drops
+-- them (production may not own these tables, and their data is kept for
+-- recovery).
+--
+-- This migration only touches Prisma-managed tables to decouple them from the
+-- legacy FK. It is intentionally idempotent so it applies cleanly to
+-- production (columns present, NOT NULL, FK present), a fresh database built
+-- from migration history, and development databases that already removed the
+-- legacy objects.
+
+-- Ensure the legacy columns exist. On databases built from migration history
+-- these already exist; this re-adds them on environments that dropped them.
+ALTER TABLE "Proclamation" ADD COLUMN IF NOT EXISTS "subscriptionLevelId" INTEGER;
+ALTER TABLE "LicenseKey" ADD COLUMN IF NOT EXISTS "level" TEXT;
+
+-- Decouple from SubscriptionLevel: drop the FK and relax NOT NULL so the
+-- application can keep inserting rows without a legacy subscription value.
+ALTER TABLE "Proclamation" DROP CONSTRAINT IF EXISTS "Proclamation_subscriptionLevelId_fkey";
+ALTER TABLE "Proclamation" ALTER COLUMN "subscriptionLevelId" DROP NOT NULL;
+ALTER TABLE "LicenseKey" ALTER COLUMN "level" DROP NOT NULL;