Amount no longer is a column by default

src/models/Donation.ts

@@ -29,9 +29,8 @@ export abstract class Donation {
 
   /**
    * The donation's amount in cents (or whatever your currency's smallest unit is.).
+   * The exact implementation may differ for each type of donation.
    */
-  @Column()
   @IsInt()
-  @IsPositive()
   amount: number;
 }