diff --git a/Cargo.lock b/Cargo.lock
index f4709b5..bf71fa9 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -125,6 +125,7 @@ dependencies = [
  "libc",
  "num-integer",
  "num-traits",
+ "serde",
  "time",
  "winapi",
 ]
@@ -191,6 +192,8 @@ dependencies = [
  "edit",
  "parking_lot",
  "rusqlite",
+ "serde",
+ "serde_json",
  "tokio",
  "toss",
 ]
diff --git a/cove-tui/Cargo.toml b/cove-tui/Cargo.toml
index 531845a..9ed4cd7 100644
--- a/cove-tui/Cargo.toml
+++ b/cove-tui/Cargo.toml
@@ -6,11 +6,13 @@ edition = "2021"
 [dependencies]
 anyhow = "1.0.57"
 async-trait = "0.1.56"
-chrono = "0.4.19"
+chrono = { version = "0.4.19", features = ["serde"] }
 crossterm = "0.23.2"
 directories = "4.0.1"
 edit = "0.1.4"
 parking_lot = "0.12.1"
 rusqlite = "0.27.0"
+serde = { version = "1.0.137", features = ["derive"] }
+serde_json = "1.0.81"
 tokio = { version = "1.19.2", features = ["full"] }
 toss = { git = "https://github.com/Garmelon/toss.git", rev = "761519c1a7cdc950eab70fd6539c71bf22919a50" }
diff --git a/cove-tui/src/euph.rs b/cove-tui/src/euph.rs
new file mode 100644
index 0000000..b098144
--- /dev/null
+++ b/cove-tui/src/euph.rs
@@ -0,0 +1,12 @@
+mod api;
+
+use std::convert::Infallible;
+
+use tokio::sync::{mpsc, oneshot};
+
+enum Request {}
+
+pub struct EuphRoom {
+    canary: oneshot::Sender<Infallible>,
+    tx: mpsc::Sender<Request>,
+}
diff --git a/cove-tui/src/euph/api.rs b/cove-tui/src/euph/api.rs
new file mode 100644
index 0000000..9339dde
--- /dev/null
+++ b/cove-tui/src/euph/api.rs
@@ -0,0 +1,24 @@
+//! Models the euphoria API at <http://api.euphoria.io/>.
+
+mod events;
+mod room_cmds;
+mod session_cmds;
+mod types;
+
+use serde::{Deserialize, Serialize};
+use serde_json::Value;
+
+pub use events::*;
+pub use room_cmds::*;
+pub use session_cmds::*;
+pub use types::*;
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct Packet {
+    pub id: Option<String>,
+    pub r#type: PacketType,
+    pub data: Option<Value>,
+    pub error: Option<String>,
+    pub throttled: Option<bool>,
+    pub throttled_reason: Option<String>,
+}
diff --git a/cove-tui/src/euph/api/events.rs b/cove-tui/src/euph/api/events.rs
new file mode 100644
index 0000000..1d79b03
--- /dev/null
+++ b/cove-tui/src/euph/api/events.rs
@@ -0,0 +1,170 @@
+//! Asynchronous events.
+
+use serde::{Deserialize, Serialize};
+
+use super::{AuthOption, Message, PersonalAccountView, SessionView, Snowflake, Time, UserId};
+
+/// Indicates that access to a room is denied.
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct BounceEvent {
+    /// The reason why access was denied.
+    pub reason: Option<String>,
+    /// Authentication options that may be used.
+    pub auth_options: Option<Vec<AuthOption>>,
+    /// Internal use only.
+    pub agent_id: Option<UserId>,
+    /// Internal use only.
+    pub ip: Option<String>,
+}
+
+/// Indicates that the session is being closed. The client will subsequently be
+/// disconnected.
+///
+/// If the disconnect reason is `authentication changed`, the client should
+/// immediately reconnect.
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct DisconnectEvent {
+    /// The reason for disconnection.
+    pub reason: String,
+}
+
+/// Sent by the server to the client when a session is started.
+///
+/// It includes information about the client's authentication and associated
+/// identity.
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct HelloEvent {
+    /// The id of the agent or account logged into this session.
+    pub id: UserId,
+    /// Details about the user's account, if the session is logged in.
+    pub account: Option<PersonalAccountView>,
+    /// Details about the session.
+    pub session: SessionView,
+    /// If true, then the account has an explicit access grant to the current
+    /// room.
+    pub account_has_access: Option<bool>,
+    /// Whether the account's email address has been verified.
+    pub account_email_verified: Option<bool>,
+    /// If true, the session is connected to a private room.
+    pub room_is_private: bool,
+    /// The version of the code being run and served by the server.
+    pub version: String,
+}
+
+/// Indicates a session just joined the room.
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct JoinEvent(pub SessionView);
+
+/// Sent to all sessions of an agent when that agent is logged in (except for
+/// the session that issued the login command).
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct LoginEvent {
+    pub account_id: Snowflake,
+}
+
+/// Sent to all sessions of an agent when that agent is logged out (except for
+/// the session that issued the logout command).
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct LogoutEvent;
+
+/// Indicates some server-side event that impacts the presence of sessions in a
+/// room.
+///
+/// If the network event type is `partition`, then this should be treated as a
+/// [`PartEvent`] for all sessions connected to the same server id/era combo.
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct NetworkEvent {
+    /// The type of network event; for now, always `partition`.
+    pub r#type: String,
+    /// The id of the affected server.
+    pub server_id: String,
+    /// The era of the affected server.
+    pub server_era: String,
+}
+
+/// Announces a nick change by another session in the room.
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct NickEvent {
+    /// The id of the session this name applies to.
+    pub session_id: String,
+    /// The id of the agent or account logged into the session.
+    pub id: UserId,
+    /// The previous name associated with the session.
+    pub from: String,
+    /// The name associated with the session henceforth.
+    pub to: String,
+}
+
+/// Indicates that a message in the room has been modified or deleted.
+///
+/// If the client offers a user interface and the indicated message is currently
+/// displayed, it should update its display accordingly.
+///
+/// The event packet includes a snapshot of the message post-edit.
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct EditMessageEvent {
+    /// The id of the edit.
+    pub edit_id: Snowflake,
+    /// The snapshot of the message post-edit.
+    #[serde(flatten)]
+    pub message: Message,
+}
+
+/// Indicates a session just disconnected from the room.
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct PartEvent(pub SessionView);
+
+/// Represents a server-to-client ping.
+///
+/// The client should send back a ping-reply with the same value for the time
+/// field as soon as possible (or risk disconnection).
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct PingEvent {
+    /// A unix timestamp according to the server's clock.
+    pub time: Time,
+    /// The expected time of the next ping event, according to the server's
+    /// clock.
+    pub next: Time,
+}
+
+/// Informs the client that another user wants to chat with them privately.
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct PmInitiateEvent {
+    /// The id of the user inviting the client to chat privately.
+    pub from: UserId,
+    /// The nick of the inviting user.
+    pub from_nick: String,
+    /// The room where the invitation was sent from.
+    pub from_room: String,
+    /// The private chat can be accessed at `/room/pm:<pm_id>`.
+    pub pm_id: Snowflake,
+}
+
+/// Indicates a message received by the room from another session.
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct SendEvent(pub Message);
+
+/// Indicates that a session has successfully joined a room.
+///
+/// It also offers a snapshot of the room’s state and recent history.
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct SnapshotEvent {
+    /// The id of the agent or account logged into this session.
+    pub identity: UserId,
+    /// The globally unique id of this session.
+    pub session_id: String,
+    /// The server’s version identifier.
+    pub version: String,
+    /// The list of all other sessions joined to the room (excluding this
+    /// session).
+    pub listing: Vec<SessionView>,
+    /// The most recent messages posted to the room (currently up to 100).
+    pub log: Vec<Message>,
+    /// The acting nick of the session; if omitted, client set nick before
+    /// speaking.
+    pub nick: Option<String>,
+    /// If given, this room is for private chat with the given nick.
+    pub pm_with_nick: Option<String>,
+    /// If given, this room is for private chat with the given user.
+    pub pm_with_user_id: Option<String>,
+}
diff --git a/cove-tui/src/euph/api/room_cmds.rs b/cove-tui/src/euph/api/room_cmds.rs
new file mode 100644
index 0000000..02dddd4
--- /dev/null
+++ b/cove-tui/src/euph/api/room_cmds.rs
@@ -0,0 +1,116 @@
+//! Chat room commands.
+
+use serde::{Deserialize, Serialize};
+
+use super::{Message, SessionView, Snowflake, UserId};
+
+/// Retrieve the full content of a single message in the room.
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct GetMessage {
+    /// The id of the message to retrieve.
+    pub id: Snowflake,
+}
+
+/// The message retrieved by [`GetMessage`].
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct GetMessageReply(pub Message);
+
+/// Request messages from the room's message log.
+///
+/// This can be used to supplement the log provided by snapshot-event (for
+/// example, when scrolling back further in history).
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct Log {
+    /// Maximum number of messages to return (up to 1000).
+    pub n: usize,
+    /// Return messages prior to this snowflake.
+    pub before: Option<Snowflake>,
+}
+
+/// List of messages from the room's message log.
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct LogReply {
+    /// List of messages returned.
+    pub log: Vec<Message>,
+    /// Messages prior to this snowflake were returned.
+    pub before: Option<Snowflake>,
+}
+
+/// Set the name you present to the room.
+///
+/// This name applies to all messages sent during this session, until the nick
+/// command is called again.
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct Nick {
+    /// The requested name (maximum length 36 bytes).
+    pub name: String,
+}
+
+/// Confirms the [`Nick`] command.
+///
+/// Returns the session's former and new names (the server may modify the
+/// requested nick).
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct NickReply {
+    /// The id of the session this name applies to.
+    pub session_id: String,
+    /// The id of the agent or account logged into the session.
+    pub id: UserId,
+    /// The previous name associated with the session.
+    pub from: String,
+    /// The name associated with the session henceforth.
+    pub to: String,
+}
+
+/// Constructs a virtual room for private messaging between the client and the
+/// given [`UserId`].
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct PmInitiate {
+    /// The id of the user to invite to chat privately.
+    pub user_id: UserId,
+}
+
+/// Provides the PMID for the requested private messaging room.
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct PmInitiateReply {
+    /// The private chat can be accessed at `/room/pm:<pm_id>`.
+    pub pm_id: Snowflake,
+    /// The nickname of the recipient of the invitation.
+    pub to_nick: String,
+}
+
+/// Send a message to a room.
+///
+/// The session must be successfully joined with the room. This message will be
+/// broadcast to all sessions joined with the room.
+///
+/// If the room is private, then the message content will be encrypted before it
+/// is stored and broadcast to the rest of the room.
+///
+/// The caller of this command will not receive the corresponding
+/// [`SendEvent`](super::SendEvent), but will receive the same information in
+/// the [`SendReply`].
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct Send {
+    /// The content of the message (client-defined).
+    pub content: String,
+    /// The id of the parent message, if any.
+    pub parent: Option<Snowflake>,
+}
+
+/// The message that was sent.
+///
+/// this includes the message id, which was populated by the server.
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct SendReply(pub Message);
+
+/// Request a list of sessions currently joined in the room.
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct Who;
+
+/// Lists the sessions currently joined in the room.
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct WhoReply {
+    /// A list of session views.
+    listing: Vec<SessionView>,
+}
diff --git a/cove-tui/src/euph/api/session_cmds.rs b/cove-tui/src/euph/api/session_cmds.rs
new file mode 100644
index 0000000..e169f7d
--- /dev/null
+++ b/cove-tui/src/euph/api/session_cmds.rs
@@ -0,0 +1,43 @@
+//! Session commands.
+
+use serde::{Deserialize, Serialize};
+
+use super::{AuthOption, Time};
+
+/// Attempt to join a private room.
+///
+/// This should be sent in response to a bounce event at the beginning of a
+/// session.
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct Auth {
+    /// The method of authentication.
+    pub r#type: AuthOption,
+    /// Use this field for [`AuthOption::Passcode`] authentication.
+    pub passcode: Option<String>,
+}
+
+/// Reports whether the [`Auth`] command succeeded.
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct AuthReply {
+    /// True if authentication succeeded.
+    pub success: bool,
+    /// If [`Self::success`] was false, the reason for failure.
+    pub reason: Option<String>,
+}
+
+/// Initiate a client-to-server ping.
+///
+/// The server will send back a [`PingReply`] with the same timestamp as soon as
+/// possible.
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct Ping {
+    /// An arbitrary value, intended to be a unix timestamp.
+    pub time: Time,
+}
+
+/// Response to a [`Ping`] command or [`PingEvent`](super::PingEvent).
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct PingReply {
+    /// The timestamp of the ping being replied to.
+    pub time: Option<Time>,
+}
diff --git a/cove-tui/src/euph/api/types.rs b/cove-tui/src/euph/api/types.rs
new file mode 100644
index 0000000..a3ccb10
--- /dev/null
+++ b/cove-tui/src/euph/api/types.rs
@@ -0,0 +1,330 @@
+//! Field types.
+
+// Serde's derive macros generate this warning and I can't turn it off locally,
+// so I'm turning it off for the entire module.
+#![allow(clippy::use_self)]
+
+use std::fmt;
+
+use chrono::{DateTime, Utc};
+use serde::{de, ser, Deserialize, Serialize};
+
+/// Describes an account and its preferred name.
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct AccountView {
+    /// The id of the account.
+    pub id: Snowflake,
+    /// The name that the holder of the account goes by.
+    pub name: String,
+}
+
+/// Mode of authentication.
+#[derive(Debug, Clone, Copy, Serialize, Deserialize)]
+#[serde(rename_all = "kebab-case")]
+pub enum AuthOption {
+    /// Authentication with a passcode, where a key is derived from the passcode
+    /// to unlock an access grant.
+    Passcode,
+}
+
+/// A node in a room's log.
+///
+/// It corresponds to a chat message, or a post, or any broadcasted event in a
+/// room that should appear in the log.
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct Message {
+    /// The id of the message (unique within a room).
+    pub id: Snowflake,
+    /// The id of the message's parent, or null if top-level.
+    pub parent: Option<Snowflake>,
+    /// The edit id of the most recent edit of this message, or null if it's
+    /// never been edited.
+    pub previous_edit_id: Option<Snowflake>,
+    /// The unix timestamp of when the message was posted.
+    pub time: Time,
+    /// The view of the sender's session.
+    pub sender: SessionView,
+    /// The content of the message (client-defined).
+    pub content: String,
+    /// The id of the key that encrypts the message in storage.
+    pub encryption_key_id: Option<String>,
+    /// The unix timestamp of when the message was last edited.
+    pub edited: Option<Time>,
+    /// The unix timestamp of when the message was deleted.
+    pub deleted: Option<Time>,
+    /// If true, then the full content of this message is not included (see
+    /// [`GetMessage`](super::GetMessage) to obtain the message with full
+    /// content).
+    pub truncated: Option<bool>,
+}
+
+/// The type of a packet.
+///
+/// Not all of these types have their corresponding data modeled as a struct.
+#[derive(Debug, Clone, Copy, Serialize, Deserialize)]
+#[serde(rename_all = "kebab-case")]
+pub enum PacketType {
+    // Asynchronous events
+    /// See [`BounceEvent`](super::BounceEvent).
+    BounceEvent,
+    /// See [`DisconnectEvent`](super::DisconnectEvent).
+    DisconnectEvent,
+    /// See [`HelloEvent`](super::HelloEvent).
+    HelloEvent,
+    /// See [`JoinEvent`](super::JoinEvent).
+    JoinEvent,
+    /// See [`LoginEvent`](super::LoginEvent).
+    LoginEvent,
+    /// See [`LogoutEvent`](super::LogoutEvent).
+    LogoutEvent,
+    /// See [`NetworkEvent`](super::NetworkEvent).
+    NetworkEvent,
+    /// See [`NickEvent`](super::NickEvent).
+    NickEvent,
+    /// See [`EditMessageEvent`](super::EditMessageEvent).
+    EditMessageEvent,
+    /// See [`PartEvent`](super::PartEvent).
+    PartEvent,
+    /// See [`PingEvent`](super::PingEvent).
+    PingEvent,
+    /// See [`PmInitiateEvent`](super::PmInitiateEvent).
+    PmInitiateEvent,
+    /// See [`SendEvent`](super::SendEvent).
+    SendEvent,
+    /// See [`SnapshotEvent`](super::SnapshotEvent).
+    SnapshotEvent,
+
+    // Session commands
+    /// See [`Auth`](super::Auth).
+    Auth,
+    /// See [`AuthReply`](super::AuthReply).
+    AuthReply,
+    /// See [`Ping`](super::Ping).
+    Ping,
+    /// See [`PingReply`](super::PingReply).
+    PingReply,
+
+    // Chat room commands
+    /// See [`GetMessage`](super::GetMessage).
+    GetMessage,
+    /// See [`GetMessageReply`](super::GetMessageReply).
+    GetMessageReply,
+    /// See [`Log`](super::Log).
+    Log,
+    /// See [`LogReply`](super::LogReply).
+    LogReply,
+    /// See [`Nick`](super::Nick).
+    Nick,
+    /// See [`NickReply`](super::NickReply).
+    NickReply,
+    /// See [`PmInitiate`](super::PmInitiate).
+    PmInitiate,
+    /// See [`PmInitiateReply`](super::PmInitiateReply).
+    PmInitiateReply,
+    /// See [`Send`](super::Send).
+    Send,
+    /// See [`SendReply`](super::SendReply).
+    SendReply,
+    /// See [`Who`](super::Who).
+    Who,
+    /// See [`WhoReply`](super::WhoReply).
+    WhoReply,
+
+    // Account commands
+    /// Not implemented.
+    ChangeEmail,
+    /// Not implemented.
+    ChangeEmailReply,
+    /// Not implemented.
+    ChangeName,
+    /// Not implemented.
+    ChangeNameReply,
+    /// Not implemented.
+    ChangePassword,
+    /// Not implemented.
+    ChangePasswordReply,
+    /// Not implemented.
+    Login,
+    /// Not implemented.
+    LoginReply,
+    /// Not implemented.
+    Logout,
+    /// Not implemented.
+    LogoutReply,
+    /// Not implemented.
+    RegisterAccount,
+    /// Not implemented.
+    RegisterAccountReply,
+    /// Not implemented.
+    ResendVerificationEmail,
+    /// Not implemented.
+    ResendVerificationEmailReply,
+    /// Not implemented.
+    ResetPassword,
+    /// Not implemented.
+    ResetPasswordReply,
+
+    // Room host commands
+    /// Not implemented.
+    Ban,
+    /// Not implemented.
+    BanReply,
+    /// Not implemented.
+    EditMessage,
+    /// Not implemented.
+    EditMessageReply,
+    /// Not implemented.
+    GrantAccess,
+    /// Not implemented.
+    GrantAccessReply,
+    /// Not implemented.
+    GrantManager,
+    /// Not implemented.
+    GrantManagerReply,
+    /// Not implemented.
+    RevokeAccess,
+    /// Not implemented.
+    RevokeAccessReply,
+    /// Not implemented.
+    RevokeManager,
+    /// Not implemented.
+    RevokeManagerReply,
+    /// Not implemented.
+    Unban,
+    /// Not implemented.
+    UnbanReply,
+
+    // Staff commands
+    /// Not implemented.
+    StaffCreateRoom,
+    /// Not implemented.
+    StaffCreateRoomReply,
+    /// Not implemented.
+    StaffEnrollOtp,
+    /// Not implemented.
+    StaffEnrollOtpReply,
+    /// Not implemented.
+    StaffGrantManager,
+    /// Not implemented.
+    StaffGrantManagerReply,
+    /// Not implemented.
+    StaffInvade,
+    /// Not implemented.
+    StaffInvadeReply,
+    /// Not implemented.
+    StaffLockRoom,
+    /// Not implemented.
+    StaffLockRoomReply,
+    /// Not implemented.
+    StaffRevokeAccess,
+    /// Not implemented.
+    StaffRevokeAccessReply,
+    /// Not implemented.
+    StaffValidateOtp,
+    /// Not implemented.
+    StaffValidateOtpReply,
+    /// Not implemented.
+    UnlockStaffCapability,
+    /// Not implemented.
+    UnlockStaffCapabilityReply,
+}
+
+/// Describes an account to its owner.
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct PersonalAccountView {
+    /// The id of the account.
+    pub id: Snowflake,
+    /// The name that the holder of the account goes by.
+    pub name: String,
+    /// The account's email address.
+    pub email: String,
+}
+
+/// Describes a session and its identity.
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct SessionView {
+    /// The id of an agent or account (or bot).
+    pub id: UserId,
+    /// The name-in-use at the time this view was captured.
+    pub name: String,
+    /// The id of the server that captured this view.
+    pub server_id: String,
+    /// The era of the server that captured this view.
+    pub server_era: String,
+    /// Id of the session, unique across all sessions globally.
+    pub session_id: String,
+    /// If true, this session belongs to a member of staff.
+    pub is_staff: Option<bool>,
+    /// If true, this session belongs to a manager of the room.
+    pub is_manager: Option<bool>,
+    /// For hosts and staff, the virtual address of the client.
+    pub client_address: Option<String>,
+    /// For staff, the real address of the client.
+    pub real_client_address: Option<String>,
+}
+
+/// A 13-character string, usually used as aunique identifier for some type of object.
+///
+/// It is the base-36 encoding of an unsigned, 64-bit integer.
+#[derive(Debug, Clone, Copy)]
+pub struct Snowflake(pub u64);
+
+impl Serialize for Snowflake {
+    fn serialize<S: ser::Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error> {
+        // Convert u64 to base36 string
+        let mut n = self.0;
+        let mut result = String::with_capacity(13);
+        for _ in 0..13 {
+            let c = char::from_digit((n % 36) as u32, 36).unwrap();
+            result.insert(0, c);
+            n /= 36;
+        }
+        result.serialize(serializer)
+    }
+}
+
+struct SnowflakeVisitor;
+
+impl<'de> de::Visitor<'de> for SnowflakeVisitor {
+    type Value = Snowflake;
+
+    fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+        write!(formatter, "a base36 string of length 13")
+    }
+
+    fn visit_str<E: de::Error>(self, v: &str) -> Result<Self::Value, E> {
+        // Convert base36 string to u64
+        if v.len() != 13 {
+            return Err(E::invalid_length(v.len(), &self));
+        }
+        let mut n = 0;
+        for c in v.chars() {
+            let digit = c
+                .to_digit(36)
+                .ok_or_else(|| E::invalid_value(de::Unexpected::Str(v), &self))?;
+            n = n * 36 + digit as u64;
+        }
+        Ok(Snowflake(n))
+    }
+}
+
+impl<'de> Deserialize<'de> for Snowflake {
+    fn deserialize<D: de::Deserializer<'de>>(deserializer: D) -> Result<Self, D::Error> {
+        deserializer.deserialize_str(SnowflakeVisitor)
+    }
+}
+
+/// Time is specified as a signed 64-bit integer, giving the number of seconds
+/// since the Unix Epoch.
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct Time(#[serde(with = "chrono::serde::ts_seconds")] pub DateTime<Utc>);
+
+/// Identifies a user.
+///
+/// The prefix of this value (up to the colon) indicates a type of session,
+/// while the suffix is a unique value for that type of session.
+///
+/// It is possible for this value to have no prefix and colon, and there is no
+/// fixed format for the unique value.
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct UserId(pub String);
diff --git a/cove-tui/src/main.rs b/cove-tui/src/main.rs
index 5f75135..aeec042 100644
--- a/cove-tui/src/main.rs
+++ b/cove-tui/src/main.rs
@@ -1,6 +1,7 @@
 #![warn(clippy::use_self)]
 
 mod chat;
+mod euph;
 mod log;
 mod store;
 mod ui;