diff --git a/set_version.sh b/set_version.sh
index 7f975188..0df975c7 100755
--- a/set_version.sh
+++ b/set_version.sh
@@ -1,3 +1,3 @@
 #!/bin/bash
-export version=0.4.2-alpha.3
+export version=0.5.0-alpha.0
 echo "pub const VERSION: &str = \"${version}\";" > src/version.rs
diff --git a/src/database/entities/microservice/mod.rs b/src/database/entities/microservice/mod.rs
index 334ed6f0..da3f42a0 100644
--- a/src/database/entities/microservice/mod.rs
+++ b/src/database/entities/microservice/mod.rs
@@ -1,2 +1,2 @@
 pub mod autumn;
-pub mod january;
\ No newline at end of file
+pub mod january;
diff --git a/src/database/entities/mod.rs b/src/database/entities/mod.rs
index 358b2ea4..4e6cc7be 100644
--- a/src/database/entities/mod.rs
+++ b/src/database/entities/mod.rs
@@ -1,9 +1,9 @@
-mod microservice;
 mod channel;
 mod message;
+mod microservice;
 mod server;
-mod user;
 mod sync;
+mod user;
 
 use microservice::*;
 
@@ -12,5 +12,5 @@ pub use channel::*;
 pub use january::*;
 pub use message::*;
 pub use server::*;
-pub use user::*;
 pub use sync::*;
+pub use user::*;
diff --git a/src/database/entities/server.rs b/src/database/entities/server.rs
index 51809537..236bb5d0 100644
--- a/src/database/entities/server.rs
+++ b/src/database/entities/server.rs
@@ -1,8 +1,15 @@
+use crate::database::*;
+use crate::notifications::events::ClientboundNotification;
+use crate::util::result::{Error, Result};
+use mongodb::bson::doc;
+use mongodb::bson::from_document;
+use mongodb::bson::to_document;
+use rocket_contrib::json::JsonValue;
 use serde::{Deserialize, Serialize};
 
 #[derive(Serialize, Deserialize, Debug, Clone)]
 pub struct MemberCompositeKey {
-    pub guild: String,
+    pub server: String,
     pub user: String,
 }
 
@@ -34,9 +41,67 @@ pub struct Server {
     pub nonce: Option<String>,
     pub owner: String,
 
+    pub name: String,
+    // pub default_permissions: u32,
     pub channels: Vec<String>,
-    pub invites: Vec<Invite>,
-    pub bans: Vec<Ban>,
-
-    pub default_permissions: u32,
+    // pub invites: Vec<Invite>,
+    // pub bans: Vec<Ban>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub icon: Option<File>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub banner: Option<File>,
+}
+
+impl Server {
+    pub async fn get(id: &str) -> Result<Server> {
+        let doc = get_collection("servers")
+            .find_one(doc! { "_id": id }, None)
+            .await
+            .map_err(|_| Error::DatabaseError {
+                operation: "find_one",
+                with: "server",
+            })?
+            .ok_or_else(|| Error::UnknownServer)?;
+
+        from_document::<Server>(doc).map_err(|_| Error::DatabaseError {
+            operation: "from_document",
+            with: "server",
+        })
+    }
+
+    pub async fn publish(self) -> Result<()> {
+        get_collection("servers")
+            .insert_one(
+                to_document(&self).map_err(|_| Error::DatabaseError {
+                    operation: "to_bson",
+                    with: "channel",
+                })?,
+                None,
+            )
+            .await
+            .map_err(|_| Error::DatabaseError {
+                operation: "insert_one",
+                with: "server",
+            })?;
+
+        let server_id = self.id.clone();
+        ClientboundNotification::ServerCreate(self).publish(server_id);
+
+        Ok(())
+    }
+
+    pub async fn publish_update(&self, data: JsonValue) -> Result<()> {
+        ClientboundNotification::ServerUpdate {
+            id: self.id.clone(),
+            data,
+            clear: None,
+        }
+        .publish(self.id.clone());
+
+        Ok(())
+    }
+
+    pub async fn delete(&self) -> Result<()> {
+        unimplemented!()
+    }
 }
diff --git a/src/database/guards/reference.rs b/src/database/guards/reference.rs
index 65e0dfbe..1c374976 100644
--- a/src/database/guards/reference.rs
+++ b/src/database/guards/reference.rs
@@ -47,6 +47,10 @@ impl Ref {
         self.fetch("channels").await
     }
 
+    pub async fn fetch_server(&self) -> Result<Server> {
+        self.fetch("servers").await
+    }
+
     pub async fn fetch_message(&self, channel: &Channel) -> Result<Message> {
         let message: Message = self.fetch("messages").await?;
         if &message.channel != channel.id() {
diff --git a/src/database/migrations/init.rs b/src/database/migrations/init.rs
index d089c0d8..d08971f8 100644
--- a/src/database/migrations/init.rs
+++ b/src/database/migrations/init.rs
@@ -29,6 +29,18 @@ pub async fn create_database() {
         .await
         .expect("Failed to create servers collection.");
 
+    db.create_collection("server_members", None)
+        .await
+        .expect("Failed to create server_members collection.");
+
+    db.create_collection("server_bans", None)
+        .await
+        .expect("Failed to create server_bans collection.");
+
+    db.create_collection("invites", None)
+        .await
+        .expect("Failed to create invites collection.");
+
     db.create_collection("migrations", None)
         .await
         .expect("Failed to create migrations collection.");
diff --git a/src/database/migrations/scripts.rs b/src/database/migrations/scripts.rs
index 8e28d7d7..0186353b 100644
--- a/src/database/migrations/scripts.rs
+++ b/src/database/migrations/scripts.rs
@@ -14,7 +14,7 @@ struct MigrationInfo {
     revision: i32,
 }
 
-pub const LATEST_REVISION: i32 = 4;
+pub const LATEST_REVISION: i32 = 5;
 
 pub async fn migrate_database() {
     let migrations = get_collection("migrations");
@@ -138,6 +138,25 @@ pub async fn run_migrations(revision: i32) -> i32 {
             .expect("Failed to create user_settings collection.");
     }
 
+    if revision <= 4 {
+        info!("Running migration [revision 4 / 2021-06-01]: Add more server collections.");
+
+        get_db()
+            .create_collection("server_members", None)
+            .await
+            .expect("Failed to create server_members collection.");
+
+        get_db()
+            .create_collection("server_bans", None)
+            .await
+            .expect("Failed to create server_bans collection.");
+
+        get_db()
+            .create_collection("invites", None)
+            .await
+            .expect("Failed to create invites collection.");
+    }
+
     // Reminder to update LATEST_REVISION when adding new migrations.
     LATEST_REVISION
 }
diff --git a/src/database/permissions/mod.rs b/src/database/permissions/mod.rs
index 61644789..376a4408 100644
--- a/src/database/permissions/mod.rs
+++ b/src/database/permissions/mod.rs
@@ -11,6 +11,7 @@ pub struct PermissionCalculator<'a> {
     user: Option<&'a User>,
     relationship: Option<&'a RelationshipStatus>,
     channel: Option<&'a Channel>,
+    server: Option<&'a Server>,
 
     has_mutual_connection: bool,
 }
@@ -23,6 +24,7 @@ impl<'a> PermissionCalculator<'a> {
             user: None,
             relationship: None,
             channel: None,
+            server: None,
 
             has_mutual_connection: false,
         }
@@ -49,6 +51,13 @@ impl<'a> PermissionCalculator<'a> {
         }
     }
 
+    pub fn with_server(self, server: &'a Server) -> PermissionCalculator {
+        PermissionCalculator {
+            server: Some(&server),
+            ..self
+        }
+    }
+
     pub fn with_mutual_connection(self) -> PermissionCalculator<'a> {
         PermissionCalculator {
             has_mutual_connection: true,
diff --git a/src/database/permissions/server.rs b/src/database/permissions/server.rs
new file mode 100644
index 00000000..94166d70
--- /dev/null
+++ b/src/database/permissions/server.rs
@@ -0,0 +1,42 @@
+use crate::database::*;
+use crate::util::result::Result;
+
+use super::PermissionCalculator;
+
+use num_enum::TryFromPrimitive;
+use std::ops;
+
+#[derive(Debug, PartialEq, Eq, TryFromPrimitive, Copy, Clone)]
+#[repr(u32)]
+pub enum ServerPermission {
+    View = 1,
+}
+
+impl_op_ex!(+ |a: &ServerPermission, b: &ServerPermission| -> u32 { *a as u32 | *b as u32 });
+impl_op_ex_commutative!(+ |a: &u32, b: &ServerPermission| -> u32 { *a | *b as u32 });
+
+bitfield! {
+    pub struct ServerPermissions(MSB0 [u32]);
+    u32;
+    pub get_view, _: 31;
+}
+
+impl<'a> PermissionCalculator<'a> {
+    pub async fn calculate_server(self) -> Result<u32> {
+        let server = if let Some(server) = self.server {
+            server
+        } else {
+            unreachable!()
+        };
+
+        if &self.perspective.id == server.owner {
+            Ok(u32::MAX)
+        } else {
+            Ok(ServerPermission::View as u32)
+        }
+    }
+
+    pub async fn for_server(self) -> Result<ChannelPermissions<[u32; 1]>> {
+        Ok(ServerPermissions([self.calculate_server().await?]))
+    }
+}
diff --git a/src/notifications/events.rs b/src/notifications/events.rs
index 2f961077..4e401cf9 100644
--- a/src/notifications/events.rs
+++ b/src/notifications/events.rs
@@ -39,6 +39,12 @@ pub enum RemoveChannelField {
     Icon,
 }
 
+#[derive(Serialize, Deserialize, Debug)]
+pub enum RemoveServerField {
+    Icon,
+    Banner,
+}
+
 #[derive(Serialize, Deserialize, Debug)]
 #[serde(tag = "type")]
 pub enum ClientboundNotification {
@@ -46,6 +52,7 @@ pub enum ClientboundNotification {
     Authenticated,
     Ready {
         users: Vec<User>,
+        servers: Vec<Server>,
         channels: Vec<Channel>,
     },
 
@@ -67,6 +74,9 @@ pub enum ClientboundNotification {
         #[serde(skip_serializing_if = "Option::is_none")]
         clear: Option<RemoveChannelField>,
     },
+    ChannelDelete {
+        id: String,
+    },
     ChannelGroupJoin {
         id: String,
         user: String,
@@ -75,9 +85,6 @@ pub enum ClientboundNotification {
         id: String,
         user: String,
     },
-    ChannelDelete {
-        id: String,
-    },
     ChannelStartTyping {
         id: String,
         user: String,
@@ -87,6 +94,25 @@ pub enum ClientboundNotification {
         user: String,
     },
 
+    ServerCreate(Server),
+    ServerUpdate {
+        id: String,
+        data: JsonValue,
+        #[serde(skip_serializing_if = "Option::is_none")]
+        clear: Option<RemoveServerField>,
+    },
+    ServerDelete {
+        id: String,
+    },
+    ServerMemberJoin {
+        id: String,
+        user: String,
+    },
+    ServerMemberLeave {
+        id: String,
+        user: String,
+    },
+
     UserUpdate {
         id: String,
         data: JsonValue,
@@ -104,8 +130,8 @@ pub enum ClientboundNotification {
     },
     UserSettingsUpdate {
         id: String,
-        update: JsonValue
-    }
+        update: JsonValue,
+    },
 }
 
 impl ClientboundNotification {
@@ -137,6 +163,12 @@ pub fn prehandle_hook(notification: &ClientboundNotification) {
                 }
             }
         }
+        ClientboundNotification::ServerMemberJoin { id, user } => {
+            subscribe_if_exists(user.clone(), id.clone()).ok();
+        }
+        ClientboundNotification::ServerCreate(server) => {
+            subscribe_if_exists(server.owner.clone(), server.id.clone()).ok();
+        }
         ClientboundNotification::UserRelationship { id, user, status } => {
             if status != &RelationshipStatus::None {
                 subscribe_if_exists(id.clone(), user.id.clone()).ok();
@@ -151,6 +183,21 @@ pub fn posthandle_hook(notification: &ClientboundNotification) {
         ClientboundNotification::ChannelDelete { id } => {
             get_hive().hive.drop_topic(&id).ok();
         }
+        ClientboundNotification::ChannelGroupLeave { id, user } => {
+            get_hive()
+                .hive
+                .unsubscribe(&user.to_string(), &id.to_string())
+                .ok();
+        }
+        ClientboundNotification::ServerDelete { id } => {
+            get_hive().hive.drop_topic(&id).ok();
+        }
+        ClientboundNotification::ServerMemberLeave { id, user } => {
+            get_hive()
+                .hive
+                .unsubscribe(&user.to_string(), &id.to_string())
+                .ok();
+        }
         ClientboundNotification::UserRelationship { id, user, status } => {
             if status == &RelationshipStatus::None {
                 get_hive()
@@ -159,12 +206,6 @@ pub fn posthandle_hook(notification: &ClientboundNotification) {
                     .ok();
             }
         }
-        ClientboundNotification::ChannelGroupLeave { id, user } => {
-            get_hive()
-                .hive
-                .unsubscribe(&user.to_string(), &id.to_string())
-                .ok();
-        }
         _ => {}
     }
 }
diff --git a/src/notifications/payload.rs b/src/notifications/payload.rs
index 12e49b59..84daf3ee 100644
--- a/src/notifications/payload.rs
+++ b/src/notifications/payload.rs
@@ -6,7 +6,7 @@ use crate::{
     util::result::{Error, Result},
 };
 use futures::StreamExt;
-use mongodb::bson::{doc, from_document};
+use mongodb::bson::{doc, from_document, Document};
 
 pub async fn generate_ready(mut user: User) -> Result<ClientboundNotification> {
     let mut user_ids: HashSet<String> = HashSet::new();
@@ -19,10 +19,68 @@ pub async fn generate_ready(mut user: User) -> Result<ClientboundNotification> {
         );
     }
 
+    let server_ids = get_collection("server_members")
+        .find(
+            doc! {
+                "_id.user": &user.id
+            },
+            None,
+        )
+        .await
+        .map_err(|_| Error::DatabaseError {
+            operation: "find",
+            with: "server_members",
+        })?
+        .filter_map(async move |s| s.ok())
+        .collect::<Vec<Document>>()
+        .await
+        .into_iter()
+        .filter_map(|x| {
+            x.get_document("_id")
+                .ok()
+                .map(|i| i.get_str("server").ok().map(|x| x.to_string()))
+        })
+        .flatten()
+        .collect::<Vec<String>>();
+
+    let mut cursor = get_collection("servers")
+        .find(
+            doc! {
+                "_id": {
+                    "$in": server_ids
+                }
+            },
+            None,
+        )
+        .await
+        .map_err(|_| Error::DatabaseError {
+            operation: "find",
+            with: "servers",
+        })?;
+
+    let mut servers = vec![];
+    let mut channel_ids = vec![];
+    while let Some(result) = cursor.next().await {
+        if let Ok(doc) = result {
+            let server: Server = from_document(doc).map_err(|_| Error::DatabaseError {
+                operation: "from_document",
+                with: "server",
+            })?;
+
+            channel_ids.extend(server.channels.iter().cloned());
+            servers.push(server);
+        }
+    }
+
     let mut cursor = get_collection("channels")
         .find(
             doc! {
                 "$or": [
+                    {
+                        "_id": {
+                            "$in": channel_ids
+                        }
+                    },
                     {
                         "channel_type": "SavedMessages",
                         "user": &user.id
@@ -75,5 +133,9 @@ pub async fn generate_ready(mut user: User) -> Result<ClientboundNotification> {
     user.online = Some(true);
     users.push(user);
 
-    Ok(ClientboundNotification::Ready { users, channels })
+    Ok(ClientboundNotification::Ready {
+        users,
+        servers,
+        channels,
+    })
 }
diff --git a/src/notifications/subscriptions.rs b/src/notifications/subscriptions.rs
index 6ef88cd2..df07afe3 100644
--- a/src/notifications/subscriptions.rs
+++ b/src/notifications/subscriptions.rs
@@ -45,5 +45,7 @@ pub async fn generate_subscriptions(user: &User) -> Result<(), String> {
         }
     }
 
+    // ! FIXME: fetch memberships for servers
+
     Ok(())
 }
diff --git a/src/notifications/websocket.rs b/src/notifications/websocket.rs
index d9d8e70a..6e275e1a 100644
--- a/src/notifications/websocket.rs
+++ b/src/notifications/websocket.rs
@@ -243,8 +243,8 @@ pub fn publish(ids: Vec<String>, notification: ClientboundNotification) {
         for id in ids {
             // Block certain notifications from reaching users that aren't meant to see them.
             match &notification {
-                ClientboundNotification::UserRelationship { id: user_id, .. } |
-                ClientboundNotification::UserSettingsUpdate { id: user_id, .. } => {
+                ClientboundNotification::UserRelationship { id: user_id, .. }
+                | ClientboundNotification::UserSettingsUpdate { id: user_id, .. } => {
                     if &id != user_id {
                         continue;
                     }
diff --git a/src/routes/guild/mod.rs b/src/routes/guild/mod.rs
deleted file mode 100644
index 018a956f..00000000
--- a/src/routes/guild/mod.rs
+++ /dev/null
@@ -1,5 +0,0 @@
-use rocket::Route;
-
-pub fn routes() -> Vec<Route> {
-    routes![]
-}
diff --git a/src/routes/mod.rs b/src/routes/mod.rs
index 4a038d94..557f9c7e 100644
--- a/src/routes/mod.rs
+++ b/src/routes/mod.rs
@@ -3,12 +3,12 @@ pub use rocket::response::Redirect;
 use rocket::Rocket;
 
 mod channels;
-mod guild;
 mod onboard;
 mod push;
 mod root;
-mod users;
+mod servers;
 mod sync;
+mod users;
 
 pub fn mount(rocket: Rocket) -> Rocket {
     rocket
@@ -16,7 +16,7 @@ pub fn mount(rocket: Rocket) -> Rocket {
         .mount("/onboard", onboard::routes())
         .mount("/users", users::routes())
         .mount("/channels", channels::routes())
-        .mount("/guild", guild::routes())
+        .mount("/servers", servers::routes())
         .mount("/push", push::routes())
         .mount("/sync", sync::routes())
 }
diff --git a/src/routes/servers/mod.rs b/src/routes/servers/mod.rs
new file mode 100644
index 00000000..74d3b848
--- /dev/null
+++ b/src/routes/servers/mod.rs
@@ -0,0 +1,8 @@
+use rocket::Route;
+
+mod server_create;
+mod server_delete;
+
+pub fn routes() -> Vec<Route> {
+    routes![server_create::req, server_delete::req]
+}
diff --git a/src/routes/servers/server_create.rs b/src/routes/servers/server_create.rs
new file mode 100644
index 00000000..96a2f8c0
--- /dev/null
+++ b/src/routes/servers/server_create.rs
@@ -0,0 +1,73 @@
+use crate::database::*;
+use crate::util::result::{Error, Result};
+
+use mongodb::bson::doc;
+use rocket_contrib::json::{Json, JsonValue};
+use serde::{Deserialize, Serialize};
+use ulid::Ulid;
+use validator::Validate;
+
+#[derive(Validate, Serialize, Deserialize)]
+pub struct Data {
+    #[validate(length(min = 1, max = 32))]
+    name: String,
+    // Maximum length of 36 allows both ULIDs and UUIDs.
+    #[validate(length(min = 1, max = 36))]
+    nonce: String,
+}
+
+#[post("/create", data = "<info>")]
+pub async fn req(user: User, info: Json<Data>) -> Result<JsonValue> {
+    info.validate()
+        .map_err(|error| Error::FailedValidation { error })?;
+
+    if get_collection("servers")
+        .find_one(
+            doc! {
+                "nonce": &info.nonce
+            },
+            None,
+        )
+        .await
+        .map_err(|_| Error::DatabaseError {
+            operation: "find_one",
+            with: "server",
+        })?
+        .is_some()
+    {
+        Err(Error::DuplicateNonce)?
+    }
+
+    let id = Ulid::new().to_string();
+    let server = Server {
+        id: id.clone(),
+        nonce: Some(info.nonce.clone()),
+        owner: user.id.clone(),
+
+        name: info.name.clone(),
+        channels: vec![],
+
+        icon: None,
+        banner: None,
+    };
+
+    get_collection("server_members")
+        .insert_one(
+            doc! {
+                "_id": {
+                    "server": id,
+                    "user": user.id
+                }
+            },
+            None,
+        )
+        .await
+        .map_err(|_| Error::DatabaseError {
+            operation: "insert_one",
+            with: "server_members",
+        })?;
+
+    server.clone().publish().await?;
+
+    Ok(json!(server))
+}
diff --git a/src/routes/servers/server_delete.rs b/src/routes/servers/server_delete.rs
new file mode 100644
index 00000000..91d8ec7f
--- /dev/null
+++ b/src/routes/servers/server_delete.rs
@@ -0,0 +1,19 @@
+use crate::util::result::{Error, Result};
+use crate::database::*;
+
+use mongodb::bson::doc;
+
+#[delete("/<target>")]
+pub async fn req(user: User, target: Ref) -> Result<()> {
+    let target = target.fetch_server().await?;
+
+    /*let perm = permissions::PermissionCalculator::new(&user)
+        .with_channel(&target)
+        .for_channel()
+        .await?;
+    if !perm.get_view() {
+        Err(Error::MissingPermission)?
+    }*/
+
+    target.delete().await
+}
diff --git a/src/routes/sync/get_settings.rs b/src/routes/sync/get_settings.rs
index b9126371..582e49c6 100644
--- a/src/routes/sync/get_settings.rs
+++ b/src/routes/sync/get_settings.rs
@@ -2,13 +2,13 @@ use crate::database::*;
 use crate::util::result::{Error, Result};
 
 use mongodb::bson::doc;
-use serde::{Deserialize, Serialize};
 use mongodb::options::FindOneOptions;
 use rocket_contrib::json::{Json, JsonValue};
+use serde::{Deserialize, Serialize};
 
 #[derive(Serialize, Deserialize)]
 pub struct Options {
-    keys: Vec<String>
+    keys: Vec<String>,
 }
 
 #[post("/settings/fetch", data = "<options>")]
@@ -27,14 +27,16 @@ pub async fn req(user: User, options: Json<Options>) -> Result<JsonValue> {
             doc! {
                 "_id": user.id
             },
-            FindOneOptions::builder()
-                .projection(projection)
-                .build()
+            FindOneOptions::builder().projection(projection).build(),
         )
         .await
-        .map_err(|_| Error::DatabaseError { operation: "find_one", with: "user_settings" })? {
+        .map_err(|_| Error::DatabaseError {
+            operation: "find_one",
+            with: "user_settings",
+        })?
+    {
         Ok(json!(doc))
     } else {
-        Ok(json!({ }))
+        Ok(json!({}))
     }
 }
diff --git a/src/routes/sync/mod.rs b/src/routes/sync/mod.rs
index 0b1ecf64..872fef1d 100644
--- a/src/routes/sync/mod.rs
+++ b/src/routes/sync/mod.rs
@@ -4,8 +4,5 @@ mod get_settings;
 mod set_settings;
 
 pub fn routes() -> Vec<Route> {
-    routes![
-        get_settings::req,
-        set_settings::req
-    ]
+    routes![get_settings::req, set_settings::req]
 }
diff --git a/src/routes/sync/set_settings.rs b/src/routes/sync/set_settings.rs
index f25405c3..cbff28e7 100644
--- a/src/routes/sync/set_settings.rs
+++ b/src/routes/sync/set_settings.rs
@@ -3,12 +3,12 @@ use crate::notifications::events::ClientboundNotification;
 use crate::util::result::{Error, Result};
 
 use chrono::prelude::*;
-use rocket::request::Form;
-use std::collections::HashMap;
-use rocket_contrib::json::Json;
 use mongodb::bson::{doc, to_bson};
-use serde::{Serialize, Deserialize};
 use mongodb::options::UpdateOptions;
+use rocket::request::Form;
+use rocket_contrib::json::Json;
+use serde::{Deserialize, Serialize};
+use std::collections::HashMap;
 
 type Data = HashMap<String, String>;
 
@@ -35,10 +35,10 @@ pub async fn req(user: User, data: Json<Data>, options: Form<Options>) -> Result
     for (key, data) in &data {
         set.insert(
             key.clone(),
-            vec! [
+            vec![
                 to_bson(&timestamp).unwrap(),
-                to_bson(&data.clone()).unwrap()
-            ]
+                to_bson(&data.clone()).unwrap(),
+            ],
         );
     }
 
@@ -51,19 +51,20 @@ pub async fn req(user: User, data: Json<Data>, options: Form<Options>) -> Result
                 doc! {
                     "$set": &set
                 },
-                UpdateOptions::builder()
-                    .upsert(true)
-                    .build()
+                UpdateOptions::builder().upsert(true).build(),
             )
             .await
-            .map_err(|_| Error::DatabaseError { operation: "update_one", with: "user_settings" })?;
+            .map_err(|_| Error::DatabaseError {
+                operation: "update_one",
+                with: "user_settings",
+            })?;
     }
 
     ClientboundNotification::UserSettingsUpdate {
         id: user.id.clone(),
-        update: json!(set)
+        update: json!(set),
     }
     .publish(user.id);
-    
+
     Ok(())
 }
diff --git a/src/util/result.rs b/src/util/result.rs
index 8b39c954..c00dca4a 100644
--- a/src/util/result.rs
+++ b/src/util/result.rs
@@ -35,6 +35,9 @@ pub enum Error {
     AlreadyInGroup,
     NotInGroup,
 
+    // ? Server related errors.
+    UnknownServer,
+
     // ? General errors.
     TooManyIds,
     FailedValidation {
@@ -80,6 +83,8 @@ impl<'r> Responder<'r, 'static> for Error {
             Error::AlreadyInGroup => Status::Conflict,
             Error::NotInGroup => Status::NotFound,
 
+            Error::UnknownServer => Status::NotFound,
+
             Error::FailedValidation { .. } => Status::UnprocessableEntity,
             Error::DatabaseError { .. } => Status::InternalServerError,
             Error::InternalError => Status::InternalServerError,
diff --git a/src/version.rs b/src/version.rs
index d3ed56bd..ab774c50 100644
--- a/src/version.rs
+++ b/src/version.rs
@@ -1 +1 @@
-pub const VERSION: &str = "0.4.2-alpha.3";
+pub const VERSION: &str = "0.5.0-alpha.0";