diff --git a/migrations/2025-02-23-165014_devices/down.sql b/migrations/2025-02-23-165014_devices/down.sql
new file mode 100644
index 0000000..3960a97
--- /dev/null
+++ b/migrations/2025-02-23-165014_devices/down.sql
@@ -0,0 +1 @@
+drop table devices;
diff --git a/migrations/2025-02-23-165014_devices/up.sql b/migrations/2025-02-23-165014_devices/up.sql
new file mode 100644
index 0000000..2e77c08
--- /dev/null
+++ b/migrations/2025-02-23-165014_devices/up.sql
@@ -0,0 +1,13 @@
+create table devices (
+    id integer primary key not null,
+
+    device_id text not null,
+    user_id bigint not null
+        references users (id)
+        on delete cascade,
+
+    caption text not null,
+    type text not null,
+
+    unique (user_id, device_id)
+);
diff --git a/src/db/mod.rs b/src/db/mod.rs
index 63d6ef0..d435e9e 100644
--- a/src/db/mod.rs
+++ b/src/db/mod.rs
@@ -1,6 +1,7 @@
 pub mod models;
 mod schema;
 
+pub use models::device::{Device, NewDevice};
 pub use models::session::Session;
 pub use models::user::{NewUser, User};
 
diff --git a/src/db/models/device.rs b/src/db/models/device.rs
new file mode 100644
index 0000000..d5dbb28
--- /dev/null
+++ b/src/db/models/device.rs
@@ -0,0 +1,115 @@
+use std::{fmt, str::FromStr};
+
+use diesel::{
+    deserialize::{FromSql, FromSqlRow},
+    expression::AsExpression,
+    prelude::*,
+    serialize::ToSql,
+    sql_types::Text,
+    sqlite::{Sqlite, SqliteValue},
+};
+use serde::{Deserialize, Serialize};
+
+use crate::db::{schema::*, DbPool, DbResult};
+
+#[derive(Serialize, Deserialize, Clone, Queryable, Selectable)]
+#[diesel(table_name = devices)]
+#[diesel(check_for_backend(diesel::sqlite::Sqlite))]
+pub struct Device {
+    id: i64,
+    device_id: String,
+    user_id: i64,
+    caption: String,
+    type_: DeviceType,
+}
+
+#[derive(Deserialize, Insertable)]
+#[diesel(table_name = devices)]
+#[diesel(check_for_backend(diesel::sqlite::Sqlite))]
+pub struct NewDevice {
+    device_id: String,
+    user_id: i64,
+    caption: String,
+    type_: DeviceType,
+}
+
+#[derive(Serialize, Deserialize, FromSqlRow, Debug, AsExpression, Clone)]
+#[diesel(sql_type = Text)]
+#[serde(rename_all = "lowercase")]
+pub enum DeviceType {
+    Desktop,
+    Laptop,
+    Mobile,
+    Server,
+    Other,
+}
+
+impl Device {
+    pub fn for_user(pool: &DbPool, user_id: i64) -> DbResult<Vec<Self>> {
+        Ok(devices::dsl::devices
+            .select(Self::as_select())
+            .filter(devices::user_id.eq(user_id))
+            .get_results(&mut pool.get()?)?)
+    }
+}
+
+impl fmt::Display for DeviceType {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(
+            f,
+            "{}",
+            match self {
+                Self::Desktop => "desktop",
+                Self::Laptop => "laptop",
+                Self::Mobile => "mobile",
+                Self::Server => "server",
+                Self::Other => "other",
+            }
+        )
+    }
+}
+
+#[derive(Debug)]
+pub struct DeviceTypeParseErr(String);
+
+impl fmt::Display for DeviceTypeParseErr {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "invalid device type '{}'", self.0)
+    }
+}
+
+impl std::error::Error for DeviceTypeParseErr {}
+
+impl FromStr for DeviceType {
+    type Err = DeviceTypeParseErr;
+
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        match s {
+            "desktop" => Ok(Self::Desktop),
+            "laptop" => Ok(Self::Laptop),
+            "mobile" => Ok(Self::Mobile),
+            "server" => Ok(Self::Server),
+            "other" => Ok(Self::Other),
+            _ => Err(DeviceTypeParseErr(s.to_string())),
+        }
+    }
+}
+
+impl FromSql<Text, Sqlite> for DeviceType {
+    fn from_sql(bytes: SqliteValue) -> diesel::deserialize::Result<Self> {
+        let s = <String as FromSql<Text, Sqlite>>::from_sql(bytes)?;
+
+        Ok(s.as_str().parse()?)
+    }
+}
+
+impl ToSql<Text, Sqlite> for DeviceType {
+    fn to_sql<'b>(
+        &'b self,
+        out: &mut diesel::serialize::Output<'b, '_, Sqlite>,
+    ) -> diesel::serialize::Result {
+        out.set_value(self.to_string());
+
+        Ok(diesel::serialize::IsNull::No)
+    }
+}
diff --git a/src/db/models/mod.rs b/src/db/models/mod.rs
index f950c0f..538594b 100644
--- a/src/db/models/mod.rs
+++ b/src/db/models/mod.rs
@@ -1,2 +1,3 @@
+pub mod device;
 pub mod session;
 pub mod user;
diff --git a/src/db/models/session.rs b/src/db/models/session.rs
index 8534410..10ee4a1 100644
--- a/src/db/models/session.rs
+++ b/src/db/models/session.rs
@@ -23,15 +23,16 @@ impl Session {
             .get_result(&mut pool.get()?)?)
     }
 
-    pub fn user_from_id(pool: &DbPool, id: i64) -> DbResult<super::user::User> {
+    pub fn user_from_id(pool: &DbPool, id: i64) -> DbResult<Option<super::user::User>> {
         Ok(sessions::dsl::sessions
             .inner_join(users::table)
             .filter(sessions::id.eq(id))
             .select(User::as_select())
-            .get_result(&mut pool.get()?)?)
+            .get_result(&mut pool.get()?)
+            .optional()?)
     }
 
-    pub fn user(&self, pool: &DbPool) -> DbResult<super::user::User> {
+    pub fn user(&self, pool: &DbPool) -> DbResult<Option<super::user::User>> {
         Self::user_from_id(pool, self.id)
     }
 
diff --git a/src/db/schema.rs b/src/db/schema.rs
index d9b70af..50ba51b 100644
--- a/src/db/schema.rs
+++ b/src/db/schema.rs
@@ -1,5 +1,16 @@
 // @generated automatically by Diesel CLI.
 
+diesel::table! {
+    devices (id) {
+        id -> BigInt,
+        device_id -> Text,
+        user_id -> BigInt,
+        caption -> Text,
+        #[sql_name = "type"]
+        type_ -> Text,
+    }
+}
+
 diesel::table! {
     sessions (id) {
         id -> BigInt,
@@ -15,9 +26,11 @@ diesel::table! {
     }
 }
 
+diesel::joinable!(devices -> users (user_id));
 diesel::joinable!(sessions -> users (user_id));
 
 diesel::allow_tables_to_appear_in_same_query!(
+    devices,
     sessions,
     users,
 );