(#2) Members can now be in multiple guilds

Signed-off-by: Louis Hollingworth <louis@hollingworth.ch>

prisma/schema.prisma

@@ -1,5 +1,6 @@
 generator client {
-  provider = "prisma-client-js"
+  provider        = "prisma-client-js"
+  previewFeatures = ["postgresqlExtensions"]
 }
 
 datasource db {
@@ -14,7 +15,14 @@ model guild {
 }
 
 model member {
-  id              String @id @unique
+  id              String   @id @default(dbgenerated("gen_random_uuid()")) @db.Uuid
   name            String
-  booster_role_id String @unique
+  booster_role_id String?
+  created_at      DateTime @default(now())
+  /// Discord Guild ID
+  dgid            String
+  /// Discord User ID
+  duid            String
+
+  @@unique([dgid, duid])
 }