Adding groups logic and restrictions (#454)

* Adding groups logic and restrictions

* Cleaning up some redundant code

* hastily made translations

* Linter issues

* More linting

* PR comments

* Covering other APIs with age filters per comment

---------

Co-authored-by: Robert Clabough <robert@clabough.tech>

server/prisma/models/group.prisma

@@ -0,0 +1,23 @@
+model UserGroup {
+  id          String @id @default(uuid())
+  name        String @unique
+  description String @default("")
+
+  createdAt DateTime @default(now())
+  updatedAt DateTime @updatedAt
+
+  users            User[]
+  bannedAgeRatings BannedAgeRating[]
+}
+
+model BannedAgeRating {
+  id String @id @default(uuid())
+
+  organization AgeRatingOrganization
+  rating       String
+
+  userGroup   UserGroup @relation(fields: [userGroupId], references: [id], onDelete: Cascade)
+  userGroupId String
+
+  @@unique([userGroupId, organization, rating], name: "groupRatingKey")
+}

server/prisma/models/user.prisma

@@ -22,6 +22,8 @@ model User {
     saves       SaveSlot[]
     screenshots Screenshot[]
     playtime    Playtime[]
+
+    groups UserGroup[]
 }
 
 model Notification {