diff --git a/packages/medusa/src/api/routes/admin/discounts/update-discount.ts b/packages/medusa/src/api/routes/admin/discounts/update-discount.ts
index e8791cb4ba..8cdf89282c 100644
--- a/packages/medusa/src/api/routes/admin/discounts/update-discount.ts
+++ b/packages/medusa/src/api/routes/admin/discounts/update-discount.ts
@@ -126,16 +126,16 @@ export class AdminPostDiscountsDiscountReq {
   @IsOptional()
   @IsGreaterThan("starts_at")
   @Type(() => Date)
-  ends_at?: Date
+  ends_at?: Date | null
 
   @IsISO8601Duration()
   @IsOptional()
-  valid_duration?: string
+  valid_duration?: string | null
 
   @IsNumber()
   @IsOptional()
   @IsPositive()
-  usage_limit?: number
+  usage_limit?: number | null
 
   @IsArray()
   @IsOptional()
diff --git a/packages/medusa/src/models/discount.ts b/packages/medusa/src/models/discount.ts
index f0acd2a6c3..a19db5c99a 100644
--- a/packages/medusa/src/models/discount.ts
+++ b/packages/medusa/src/models/discount.ts
@@ -10,7 +10,7 @@ import {
   ManyToMany,
   ManyToOne,
   PrimaryColumn,
-  UpdateDateColumn,
+  UpdateDateColumn
 } from "typeorm"
 import { ulid } from "ulid"
 import { DbAwareColumn, resolveDbType } from "../utils/db-aware-column"
@@ -54,10 +54,10 @@ export class Discount {
   starts_at: Date
 
   @Column({ type: resolveDbType("timestamptz"), nullable: true })
-  ends_at: Date
+  ends_at: Date | null
 
-  @Column({ nullable: true })
-  valid_duration: string
+  @Column({ type: String, nullable: true })
+  valid_duration: string | null
 
   @ManyToMany(() => Region, { cascade: true })
   @JoinTable({
@@ -73,8 +73,8 @@ export class Discount {
   })
   regions: Region[]
 
-  @Column({ nullable: true })
-  usage_limit: number
+  @Column({ type: Number, nullable: true })
+  usage_limit: number | null
 
   @Column({ default: 0 })
   usage_count: number
diff --git a/packages/medusa/src/services/discount.ts b/packages/medusa/src/services/discount.ts
index 1dadeaaed1..04af4a5c80 100644
--- a/packages/medusa/src/services/discount.ts
+++ b/packages/medusa/src/services/discount.ts
@@ -721,7 +721,11 @@ class DiscountService extends BaseService {
   }
 
   hasExpired(discount: Discount): boolean {
-    return discount.ends_at && isPast(discount.ends_at)
+    if (!discount.ends_at) {
+      return false
+    }
+
+    return isPast(discount.ends_at)
   }
 
   isDisabled(discount: Discount): boolean {
diff --git a/packages/medusa/src/types/discount.ts b/packages/medusa/src/types/discount.ts
index e35b045cb2..388721eb96 100644
--- a/packages/medusa/src/types/discount.ts
+++ b/packages/medusa/src/types/discount.ts
@@ -151,9 +151,9 @@ export type UpdateDiscountInput = {
   is_dynamic?: boolean
   is_disabled?: boolean
   starts_at?: Date
-  ends_at?: Date
-  valid_duration?: string
-  usage_limit?: number
+  ends_at?: Date | null
+  valid_duration?: string | null
+  usage_limit?: number | null
   regions?: string[]
   metadata?: Record<string, unknown>
 }