feat(api): exam date use + split prisma files (#62344)

Co-authored-by: Oliver Eyton-Williams <ojeytonwilliams@gmail.com>

api/package.json

@@ -13,7 +13,7 @@
     "@fastify/swagger-ui": "5.2.0",
     "@fastify/type-provider-typebox": "5.1.0",
     "@growthbook/growthbook": "1.3.1",
-    "@prisma/client": "5.5.2",
+    "@prisma/client": "6.16.2",
     "@sentry/node": "9.1.0",
     "@sinclair/typebox": "^0.34.33",
     "@types/pino": "^7.0.5",
@@ -51,7 +51,7 @@
     "dotenv-cli": "7.3.0",
     "jsdom": "^26.1.0",
     "msw": "^2.7.0",
-    "prisma": "5.5.2",
+    "prisma": "6.16.2",
     "supertest": "6.3.3",
     "tsx": "4.19.1",
     "vitest": "^3.2.4"