diff --git a/migrations/2025-02-23-095541_initial/up.sql b/migrations/2025-02-23-095541_initial/up.sql
index 76449a4..e5e7922 100644
--- a/migrations/2025-02-23-095541_initial/up.sql
+++ b/migrations/2025-02-23-095541_initial/up.sql
@@ -24,6 +24,9 @@ create table devices (
     user_id bigint not null
         references users (id)
         on delete cascade,
+    sync_group_id bigint
+        references sync_group (id)
+        on delete set null,
 
     caption text not null,
     type text not null,
@@ -31,6 +34,10 @@ create table devices (
     unique (user_id, device_id)
 );
 
+create table sync_groups (
+    id integer primary key not null
+);
+
 create table device_subscriptions (
     id integer primary key not null,
 
diff --git a/src/db/mod.rs b/src/db/mod.rs
index 54c5f74..ef3eeb8 100644
--- a/src/db/mod.rs
+++ b/src/db/mod.rs
@@ -5,10 +5,12 @@ mod schema;
 use diesel::connection::InstrumentationEvent;
 use diesel::r2d2::CustomizeConnection;
 use diesel::Connection;
+
 pub use models::device::{Device, DeviceType, NewDevice};
 pub use models::device_subscription::{DeviceSubscription, NewDeviceSubscription};
 pub use models::episode_action::{ActionType, EpisodeAction, NewEpisodeAction};
 pub use models::session::Session;
+pub use models::sync_group::SyncGroup;
 pub use models::user::{NewUser, User};
 
 pub use repository::SqliteRepository;
diff --git a/src/db/models/device.rs b/src/db/models/device.rs
index f94bf43..2be8f75 100644
--- a/src/db/models/device.rs
+++ b/src/db/models/device.rs
@@ -21,6 +21,7 @@ pub struct Device {
     pub user_id: i64,
     pub caption: String,
     pub type_: DeviceType,
+    pub sync_group_id: Option<i64>,
 }
 
 #[derive(Deserialize, Insertable)]
diff --git a/src/db/models/mod.rs b/src/db/models/mod.rs
index 440060b..8e6ebf9 100644
--- a/src/db/models/mod.rs
+++ b/src/db/models/mod.rs
@@ -2,4 +2,5 @@ pub mod device;
 pub mod device_subscription;
 pub mod episode_action;
 pub mod session;
+pub mod sync_group;
 pub mod user;
diff --git a/src/db/models/sync_group.rs b/src/db/models/sync_group.rs
new file mode 100644
index 0000000..edeca8c
--- /dev/null
+++ b/src/db/models/sync_group.rs
@@ -0,0 +1,33 @@
+use diesel::{
+    dsl::{exists, not},
+    prelude::*,
+};
+
+use crate::db::schema::*;
+
+#[derive(Queryable, Selectable)]
+#[diesel(table_name = sync_groups)]
+#[diesel(check_for_backend(diesel::sqlite::Sqlite))]
+pub struct SyncGroup {
+    pub id: i64,
+}
+
+impl SyncGroup {
+    pub fn new(conn: &mut SqliteConnection) -> QueryResult<Self> {
+        diesel::insert_into(sync_groups::table)
+            .default_values()
+            .returning(SyncGroup::as_returning())
+            .get_result(conn)
+    }
+
+    pub fn remove_unused(conn: &mut SqliteConnection) -> QueryResult<usize> {
+        diesel::delete(
+            sync_groups::table.filter(not(exists(
+                devices::table
+                    .select(1.into_sql::<diesel::sql_types::Integer>())
+                    .filter(devices::sync_group_id.eq(sync_groups::id.nullable())),
+            ))),
+        )
+        .execute(conn)
+    }
+}
diff --git a/src/db/schema.rs b/src/db/schema.rs
index 2f597f1..7eb0429 100644
--- a/src/db/schema.rs
+++ b/src/db/schema.rs
@@ -15,6 +15,7 @@ diesel::table! {
         id -> BigInt,
         device_id -> Text,
         user_id -> BigInt,
+        sync_group_id -> Nullable<BigInt>,
         caption -> Text,
         #[sql_name = "type"]
         type_ -> Text,
@@ -45,6 +46,12 @@ diesel::table! {
     }
 }
 
+diesel::table! {
+    sync_groups (id) {
+        id -> BigInt,
+    }
+}
+
 diesel::table! {
     users (id) {
         id -> BigInt,
@@ -64,5 +71,6 @@ diesel::allow_tables_to_appear_in_same_query!(
     devices,
     episode_actions,
     sessions,
+    sync_groups,
     users,
 );