Revert "fix: wrap card creation in transaction to prevent race condition (#349)" (#451)

This reverts commit f6ee844.

Author: Harxhit

apps/backend/src/routes/cards.ts

@@ -79,57 +79,6 @@ export async function cardRoutes(app: FastifyInstance): Promise<void> {
     }
 
     try {
-      // Verify every supplied link belongs to the authenticated user before any write.
-      // A count mismatch means at least one ID is foreign — reject before touching the DB.
-      if (parsed.data.linkIds.length > 0) {
-        const ownedLinks = await app.prisma.platformLink.findMany({
-          where: { id: { in: parsed.data.linkIds }, userId },
-          select: { id: true },
-        });
-
-        if (ownedLinks.length !== parsed.data.linkIds.length) {
-          return reply.status(403).send({ error: 'One or more links do not belong to your account' });
-        }
-      }
-
-      // Check if user's first card -> make it default.
-      // Prisma wraps the nested cardLinks.create inside card.create in a single
-      // implicit transaction, so either both the card and its links are written or neither is.
-      const card = await app.prisma.$transaction(async (tx) => {
-  const cardCount = await tx.card.count({
-    where: { userId },
-  });
-
-  return tx.card.create({
-        data: {
-          userId,
-          title: parsed.data.title,
-          isDefault: cardCount === 0,
-          cardLinks: {
-            create: parsed.data.linkIds.map((linkId, index) => ({
-              platformLinkId: linkId,
-              displayOrder: index,
-            })),
-          },
-        },
-        include: {
-          cardLinks: {
-            include: { platformLink: true },
-            orderBy: { displayOrder: 'asc' },
-          },
-        },
-      });
-    }};
-      const response = {
-        id: card.id, 
-        title: card.title,
-        isDefault: card.isDefault,
-        links: card.cardLinks.map((cl: CardLinkWithPlatform) => cl.platformLink),
-      }
-
-      return reply.status(201).send(response);
-    } catch (error) {
-      return handleDbError(error, request, reply);
       const card = await cardService.createCard(app, userId, parsed.data)
       return reply.status(201).send(card)
     } catch (error: any) {