first commit

src/lib/db.ts

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+import { PrismaPg } from "@prisma/adapter-pg";
+import { PrismaClient } from "@/generated/prisma/client";
+
+export type Db = PrismaClient;
+/** Transaktions-Client innerhalb von db.$transaction(async (tx) => …). */
+export type Tx = Parameters<Parameters<PrismaClient["$transaction"]>[0]>[0];
+
+const globalForPrisma = globalThis as unknown as { prisma?: PrismaClient };
+
+function createClient(): PrismaClient {
+  const connectionString = process.env.DATABASE_URL;
+  if (!connectionString) throw new Error("DATABASE_URL ist nicht gesetzt.");
+  const adapter = new PrismaPg({ connectionString, max: Number(process.env.DATABASE_POOL_SIZE ?? 10) });
+  return new PrismaClient({ adapter, log: ["error"] });
+}
+
+/** Lazy, damit der Build (ohne Datenbank) Module importieren kann. */
+export function getDb(): PrismaClient {
+  if (!globalForPrisma.prisma) globalForPrisma.prisma = createClient();
+  return globalForPrisma.prisma;
+}
+
+export const CAMP_ID = "modelcamp-2027";