Add Upload.paid boolean column

One item can have multiple images linked to it, but an image can also be used in multiple items (many-to-many relation).

Since we don't really care to which item an image is linked and vice versa, we just use a boolean column to mark if an image was already paid for.

This makes fee calculation easier since no JOINs are required.

prisma/migrations/20231019162233_item_multiple_uploads/migration.sql

@@ -1,8 +0,0 @@
-/*
-  Warnings:
-
-  - You are about to drop the column `uploadId` on the `Item` table. All the data in the column will be lost.
-
-*/
--- DropIndex
-DROP INDEX "Upload.itemId_unique";

prisma/migrations/20231025000727_upload_paid/migration.sql

@@ -0,0 +1,18 @@
+/*
+  Warnings:
+
+  - You are about to drop the column `itemId` on the `Upload` table. All the data in the column will be lost.
+
+*/
+-- DropForeignKey
+ALTER TABLE "Upload" DROP CONSTRAINT "Upload_itemId_fkey";
+
+-- DropIndex
+DROP INDEX "Upload.itemId_index";
+
+-- DropIndex
+DROP INDEX "Upload.itemId_unique";
+
+-- AlterTable
+ALTER TABLE "Upload" DROP COLUMN "itemId",
+ADD COLUMN     "paid" BOOLEAN;

prisma/schema.prisma

@@ -176,14 +176,12 @@ model Upload {
   size      Int
   width     Int?
   height    Int?
-  itemId    Int?
   userId    Int
-  item      Item?    @relation(fields: [itemId], references: [id])
   user      User     @relation("Uploads", fields: [userId], references: [id], onDelete: Cascade)
   User      User[]
+  paid      Boolean?
 
   @@index([createdAt], map: "Upload.created_at_index")
-  @@index([itemId], map: "Upload.itemId_index")
   @@index([userId], map: "Upload.userId_index")
 }
 
@@ -299,7 +297,6 @@ model Item {
   PollOption         PollOption[]
   PollVote           PollVote[]
   ThreadSubscription ThreadSubscription[]
-  uploads            Upload[]
   User               User[]
   itemForwards       ItemForward[]