diff --git a/src/types.ts b/src/types.ts
index 389d744..ef17963 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -9,7 +9,7 @@ export interface Account {
   status?: string; // ACTIVE, CLOSED
   currency?: string; // Default: USD
   balance: number | Decimal; // Current balance - can be Prisma Decimal or number
-  notes?: string; // Optional notes
+  notes?: string | null; // Optional notes - accepts null for Prisma compatibility
   createdAt?: Date;
   updatedAt?: Date;
 }
@@ -20,11 +20,11 @@ export interface Transaction {
   date: string | Date; // ISO date string or Date object
   description: string;
   amount: number | Decimal; // Amount - can be Prisma Decimal or number
-  category?: string; // Optional category
+  category?: string | null; // Optional category - accepts null for Prisma compatibility
   status?: string; // PENDING, CLEARED
   type?: string; // DEPOSIT, WITHDRAWAL, TRANSFER
-  notes?: string; // Optional notes
-  tags?: string; // Optional comma-separated tags
+  notes?: string | null; // Optional notes - accepts null for Prisma compatibility
+  tags?: string | null; // Optional comma-separated tags - accepts null for Prisma compatibility
   createdAt?: Date;
   updatedAt?: Date;
 }