diff --git a/api/prisma/schema.prisma b/api/prisma/schema.prisma
index aedd827ad26..182fec37e43 100644
--- a/api/prisma/schema.prisma
+++ b/api/prisma/schema.prisma
@@ -178,9 +178,9 @@ model Donation {
 }
 
 model UserRateLimit {
-  id             String @id @default(auto()) @map("_id") @db.ObjectId
-  /// Field referred in an index, but found no data to define the type.
-  expirationDate Json?
+  id             String  @id @map("_id")
+  counter        Int
+  expirationDate DateTime @db.Date
 
   @@index([expirationDate], map: "expirationDate_1")
 }
diff --git a/api/src/routes/auth.ts b/api/src/routes/auth.ts
index 428c97b0aca..9da7782cd5f 100644
--- a/api/src/routes/auth.ts
+++ b/api/src/routes/auth.ts
@@ -1,4 +1,5 @@
 import { FastifyPluginCallback, FastifyRequest } from 'fastify';
+// TODO(Post-MVP): use fastify-rate-limit instead of express-rate-limit
 import rateLimit from 'express-rate-limit';
 // @ts-expect-error - no types
 import MongoStoreRL from 'rate-limit-mongo';