diff --git a/prisma/migrations/20250722170032_group_array_required/migration.sql b/prisma/migrations/20250722170032_group_array_required/migration.sql
new file mode 100644
index 0000000..e2851d3
--- /dev/null
+++ b/prisma/migrations/20250722170032_group_array_required/migration.sql
@@ -0,0 +1,9 @@
+/*
+  Warnings:
+
+  - The `group` column on the `bookmarks` table would be dropped and recreated. This will lead to data loss if there is data in the column.
+
+*/
+-- AlterTable
+ALTER TABLE "bookmarks" DROP COLUMN "group",
+ADD COLUMN     "group" TEXT[];
diff --git a/prisma/schema.prisma b/prisma/schema.prisma
index 1d590af..03619a6 100644
--- a/prisma/schema.prisma
+++ b/prisma/schema.prisma
@@ -13,7 +13,7 @@ model bookmarks {
   user_id    String   @db.VarChar(255)
   meta       Json
   updated_at DateTime @db.Timestamptz(0)
-  group      String?
+  group      String[]
 
   @@id([tmdb_id, user_id])
   @@unique([tmdb_id, user_id], map: "bookmarks_tmdb_id_user_id_unique")
diff --git a/server/routes/users/[id]/bookmarks/[tmdbid]/index.ts b/server/routes/users/[id]/bookmarks/[tmdbid]/index.ts
index d2639c4..cfa9ec9 100644
--- a/server/routes/users/[id]/bookmarks/[tmdbid]/index.ts
+++ b/server/routes/users/[id]/bookmarks/[tmdbid]/index.ts
@@ -9,7 +9,7 @@ const bookmarkMetaSchema = z.object({
   year: z.number(),
   poster: z.string().optional(),
   type: z.enum(['movie', 'show']),
-  group: z.string().optional(),
+  group: z.union([z.string(), z.array(z.string())]).optional(),
 });
 
 // Support both formats: direct fields or nested under meta
@@ -45,6 +45,13 @@ export default defineEventHandler(async event => {
       // Validate the meta data separately
       const validatedMeta = bookmarkMetaSchema.parse(metaData);
 
+      // Normalize group to always be an array if present
+      if (validatedMeta.group) {
+        validatedMeta.group = Array.isArray(validatedMeta.group)
+          ? validatedMeta.group
+          : [validatedMeta.group];
+      }
+
       const bookmark = await prisma.bookmarks.create({
         data: {
           user_id: session.user,