fix: OnDelete SetNull for watchlist delete on watchlistAudit (calcom#25690)

* OnDelete SetNull for watchlist delete on watchlistAudit

* make watchlistId nullable

* type fix

Author: alishaz-polymath

packages/features/watchlist/lib/types.ts

@@ -22,7 +22,7 @@ export interface WatchlistAudit {
   action: WatchlistAction;
   changedAt: Date;
   changedByUserId?: number | null;
-  watchlistId: string;
+  watchlistId: string | null;
 }
 
 export interface WatchlistEventAudit {

packages/lib/server/repository/watchlist.interface.ts

@@ -15,7 +15,7 @@ export interface WatchlistEntry {
 
 export interface WatchlistAuditEntry {
   id: string;
-  watchlistId: string;
+  watchlistId: string | null;
   type: WatchlistType;
   value: string;
   description: string | null;

packages/prisma/migrations/20251208035931_watchlist_audit_on_delete_set_null/migration.sql

@@ -0,0 +1,8 @@
+-- DropForeignKey
+ALTER TABLE "public"."WatchlistAudit" DROP CONSTRAINT "WatchlistAudit_watchlistId_fkey";
+
+-- AlterTable
+ALTER TABLE "public"."WatchlistAudit" ALTER COLUMN "watchlistId" DROP NOT NULL;
+
+-- AddForeignKey
+ALTER TABLE "public"."WatchlistAudit" ADD CONSTRAINT "WatchlistAudit_watchlistId_fkey" FOREIGN KEY ("watchlistId") REFERENCES "public"."Watchlist"("id") ON DELETE SET NULL ON UPDATE CASCADE;

packages/prisma/schema.prisma

@@ -2382,8 +2382,8 @@ model WatchlistAudit {
   changedAt       DateTime @default(now())
   changedByUserId Int?
 
-  watchlistId String     @db.Uuid
-  watchlist   Watchlist? @relation(fields: [watchlistId], references: [id], onDelete: Cascade)
+  watchlistId String?    @db.Uuid
+  watchlist   Watchlist? @relation(fields: [watchlistId], references: [id], onDelete: SetNull)
 
   @@index([watchlistId, changedAt])
 }