diff --git a/admin/app/models/curated_collection_resource.ts b/admin/app/models/curated_collection_resource.ts
index 03e44a1..0b43dd0 100644
--- a/admin/app/models/curated_collection_resource.ts
+++ b/admin/app/models/curated_collection_resource.ts
@@ -6,6 +6,14 @@ import type { BelongsTo } from '@adonisjs/lucid/types/relations'
 export default class CuratedCollectionResource extends BaseModel {
   static namingStrategy = new SnakeCaseNamingStrategy()
 
+  static indexes = [
+    {
+      name: 'curated_collection_resources_unique',
+      columns: ['curated_collection_slug', 'url'],
+      unique: true,
+    },
+  ]
+
   @column({ isPrimary: true })
   declare id: number
 
diff --git a/admin/app/services/map_service.ts b/admin/app/services/map_service.ts
index 2a9eea7..b745510 100644
--- a/admin/app/services/map_service.ts
+++ b/admin/app/services/map_service.ts
@@ -286,18 +286,26 @@ export class MapService implements IMapService {
       })
 
       for (const collection of validated.collections) {
-        const collectionResult = await CuratedCollection.updateOrCreate(
-          { slug: collection.slug },
+        const { resources, ...restCollection } = collection; // we'll handle resources separately
+
+        // Upsert the collection itself
+        await CuratedCollection.updateOrCreate(
+          { slug: restCollection.slug },
           {
-            ...collection,
+            ...restCollection,
             type: 'map',
           }
         )
-        logger.info(`[MapService] Upserted curated collection: ${collection.slug}`)
+        logger.info(`[MapService] Upserted curated collection: ${restCollection.slug}`)
+
+        // Upsert collection's resources
+        const resourcesResult = await CuratedCollectionResource.updateOrCreateMany('url', resources.map((res) => ({
+          ...res,
+          curated_collection_slug: restCollection.slug, // add the foreign key
+        })))
 
-        await collectionResult.related('resources').createMany(collection.resources)
         logger.info(
-          `[MapService] Upserted ${collection.resources.length} resources for collection: ${collection.slug}`
+          `[MapService] Upserted ${resourcesResult.length} resources for collection: ${restCollection.slug}`
         )
       }
 
diff --git a/admin/database/migrations/1770269324176_add_unique_constraint_to_curated_collection_resources_table.ts b/admin/database/migrations/1770269324176_add_unique_constraint_to_curated_collection_resources_table.ts
new file mode 100644
index 0000000..08879c9
--- /dev/null
+++ b/admin/database/migrations/1770269324176_add_unique_constraint_to_curated_collection_resources_table.ts
@@ -0,0 +1,19 @@
+import { BaseSchema } from '@adonisjs/lucid/schema'
+
+export default class extends BaseSchema {
+  protected tableName = 'curated_collection_resources'
+
+  async up() {
+    this.schema.alterTable(this.tableName, (table) => {
+      table.unique(['curated_collection_slug', 'url'], {
+        indexName: 'curated_collection_resources_unique',
+      })
+    })
+  }
+
+  async down() {
+    this.schema.alterTable(this.tableName, (table) => {
+      table.dropUnique(['curated_collection_slug', 'url'], 'curated_collection_resources_unique')
+    })
+  }
+}
\ No newline at end of file