fix(db): split referral_legacy migration to handle PostgreSQL enum limitation

PostgreSQL ADD VALUE for enums is not visible within the same transaction,
so the UPDATE statements need to run in a separate migration after the
enum value is committed.

- 0039: Add referral_legacy enum value + is_legacy column (DEFAULT true)
- 0040: Backfill credit_ledger with referral_legacy type

Author: brandonkachen

packages/internal/src/db/migrations/0039_quiet_franklin_storm.sql

@@ -1,16 +1,2 @@
 ALTER TYPE "public"."grant_type" ADD VALUE 'referral_legacy' BEFORE 'purchase';--> statement-breakpoint
-ALTER TABLE "referral" ADD COLUMN "is_legacy" boolean DEFAULT false NOT NULL;--> statement-breakpoint
--- Backfill: Mark all existing referrals as legacy (they were created under the old recurring program)
-UPDATE "referral" SET "is_legacy" = true;--> statement-breakpoint
--- Migrate existing referral grants that have an expiry date to referral_legacy type
--- (These are the recurring grants from the old program)
-UPDATE "credit_ledger" 
-SET "type" = 'referral_legacy', 
-    "priority" = 30
-WHERE "type" = 'referral' 
-  AND "expires_at" IS NOT NULL;--> statement-breakpoint
--- Update priority for remaining referral grants (one-time grants, if any exist) to new priority
-UPDATE "credit_ledger"
-SET "priority" = 50
-WHERE "type" = 'referral'
-  AND "expires_at" IS NULL;
+ALTER TABLE "referral" ADD COLUMN "is_legacy" boolean DEFAULT true NOT NULL;

packages/internal/src/db/migrations/0040_referral_legacy_backfill.sql

@@ -0,0 +1,12 @@
+-- Migrate existing referral grants that have an expiry date to referral_legacy type
+-- (These are the recurring grants from the old program)
+UPDATE "credit_ledger" 
+SET "type" = 'referral_legacy', 
+    "priority" = 30
+WHERE "type" = 'referral' 
+  AND "expires_at" IS NOT NULL;--> statement-breakpoint
+-- Update priority for remaining referral grants (one-time grants, if any exist) to new priority
+UPDATE "credit_ledger"
+SET "priority" = 50
+WHERE "type" = 'referral'
+  AND "expires_at" IS NULL;

packages/internal/src/db/migrations/meta/_journal.json

@@ -281,6 +281,13 @@
       "when": 1769482939158,
       "tag": "0039_quiet_franklin_storm",
       "breakpoints": true
+    },
+    {
+      "idx": 40,
+      "version": "7",
+      "when": 1769650000000,
+      "tag": "0040_referral_legacy_backfill",
+      "breakpoints": true
     }
   ]
 }