update briva account

src/entity/briva_accounts.ts

@@ -43,13 +43,13 @@ export class BrivaAccount {
     last_trans_at: Date;
 
     @Column({
-        nullable: false,
+        nullable: true,
         length: 256
     })
     last_trans_ref_number: string;
 
     @Column({
-        nullable: false,
+        nullable: true,
         type: 'float8'
     })
     last_trans_amount: number;