fix: prisma url in schema + first user becomes ADMIN

- Add url = env("DATABASE_URL") back to schema (required by Prisma 7.5)
- Simplify prisma.config.ts
- First registered user auto-promoted to ADMIN via databaseHooks
- Subsequent users get HOST role

CLAUDE.md

@@ -173,8 +173,8 @@ DEV_ACCESS_KEY=mySecretKey123
 ## Prisma 7 Notes
 
 - `prisma.config.ts` in project root (required by Prisma 7)
-- `datasourceUrl` passed via PrismaClient constructor, not in schema
-- Schema has no `url` in datasource block — only `provider`
+- `url = env("DATABASE_URL")` in schema datasource — standard approach, works with CLI and PrismaClient
+- `new PrismaClient()` without arguments — URL resolved from schema's `env("DATABASE_URL")`
 - Use `-- --webpack` flag for `next build` on Windows (Turbopack WASM issue)
 
 ## Auth Notes

prisma.config.ts

@@ -4,9 +4,4 @@ import { defineConfig } from "prisma/config";
 export default defineConfig({
   earlyAccess: true,
   schema: path.join(__dirname, "prisma", "schema.prisma"),
-  migrate: {
-    async url() {
-      return process.env.DATABASE_URL!;
-    },
-  },
-} as any);
+});

prisma/schema.prisma

@@ -9,6 +9,7 @@ generator client {
 
 datasource db {
   provider = "postgresql"
+  url      = env("DATABASE_URL")
 }
 
 // ======================== ENUMS =============================

src/lib/auth.ts

@@ -43,4 +43,27 @@ export const auth = betterAuth({
     expiresIn: 60 * 60 * 24 * 7, // 7 days
     updateAge: 60 * 60 * 24, // 1 day
   },
+  user: {
+    additionalFields: {
+      role: {
+        type: "string",
+        defaultValue: "HOST",
+        input: false,
+      },
+    },
+  },
+  databaseHooks: {
+    user: {
+      create: {
+        before: async (user) => {
+          // Первый зарегистрированный пользователь → ADMIN
+          const count = await prisma.user.count();
+          if (count === 0) {
+            return { data: { ...user, role: "ADMIN" } };
+          }
+          return { data: { ...user, role: "HOST" } };
+        },
+      },
+    },
+  },
 });