diff --git a/migrations/20230925082714_sleep_duration_ms_required/migration.sql b/migrations/20230925082714_sleep_duration_ms_required/migration.sql
new file mode 100644
index 0000000..2f6953c
--- /dev/null
+++ b/migrations/20230925082714_sleep_duration_ms_required/migration.sql
@@ -0,0 +1,8 @@
+/*
+  Warnings:
+
+  - Made the column `sleepDurationMs` on table `Subscription` required. This step will fail if there are existing NULL values in that column.
+
+*/
+-- AlterTable
+ALTER TABLE "Subscription" ALTER COLUMN "sleepDurationMs" SET NOT NULL;
diff --git a/schema.prisma b/schema.prisma
index a0d6efd..50c5968 100644
--- a/schema.prisma
+++ b/schema.prisma
@@ -18,7 +18,7 @@ model Subscription {
   message String?
   payerData String? // LUD-18 encoded JSON payer data
   sleepDuration String
-  sleepDurationMs BigInt?
+  sleepDurationMs BigInt
   createdDateTime DateTime @default(now())
   lastEventDateTime DateTime?
   lastSuccessfulPaymentDateTime DateTime?