Migrate database to Vercel postgres

src/prisma/schema.prisma

@@ -6,8 +6,10 @@ generator client {
 }
 
 datasource db {
-  provider = "cockroachdb"
-  url      = env("DATABASE_URL")
+  provider          = "postgresql"
+  url               = env("POSTGRES_PRISMA_URL") // uses connection pooling
+  directUrl         = env("POSTGRES_URL_NON_POOLING") // uses a direct connection
+  shadowDatabaseUrl = env("POSTGRES_URL_NON_POOLING") // used for migrations
 }
 
 model User {