diff --git a/src/cli/serve.rs b/src/cli/serve.rs
index e1d0fa3..664a1e0 100644
--- a/src/cli/serve.rs
+++ b/src/cli/serve.rs
@@ -9,7 +9,6 @@ pub fn serve(config: &crate::config::Config) -> u8 {
     let repo = db::SqliteRepository::from(pool);
 
     let ctx = server::Context {
-        repo: repo.clone(),
         store: crate::gpodder::GpodderRepository::new(repo),
     };
     let app = server::app(ctx);
diff --git a/src/db/repository/episode_action.rs b/src/db/repository/episode_action.rs
index 3f66bc9..5a45cd2 100644
--- a/src/db/repository/episode_action.rs
+++ b/src/db/repository/episode_action.rs
@@ -1,4 +1,4 @@
-use chrono::DateTime;
+use chrono::{DateTime, Utc};
 use diesel::prelude::*;
 
 use super::SqliteRepository;
@@ -26,7 +26,7 @@ impl From<gpodder::EpisodeAction> for db::NewEpisodeAction {
             podcast_url: value.podcast,
             episode_url: value.episode,
             time_changed: 0,
-            timestamp: value.timestamp.map(|t| t.and_utc().timestamp()),
+            timestamp: value.timestamp.map(|t| t.timestamp()),
             action,
             started,
             position,
@@ -58,7 +58,8 @@ impl From<(Option<String>, db::EpisodeAction)> for gpodder::EpisodeAction {
                 // SAFETY the input to the from_timestamp function is always the result of a
                 // previous timestamp() function call, which is guaranteed to be each other's
                 // reverse
-                .map(|ts| DateTime::from_timestamp(ts, 0).unwrap().naive_utc()),
+                .map(|ts| DateTime::from_timestamp(ts, 0).unwrap()),
+            time_changed: DateTime::from_timestamp(db_action.time_changed, 0).unwrap(),
             device: device_id,
             action,
         }
@@ -70,8 +71,9 @@ impl gpodder::EpisodeActionRepository for SqliteRepository {
         &self,
         user: &gpodder::User,
         actions: Vec<gpodder::EpisodeAction>,
-    ) -> Result<i64, gpodder::AuthErr> {
-        let time_changed = chrono::Utc::now().timestamp();
+        time_changed: DateTime<Utc>,
+    ) -> Result<(), gpodder::AuthErr> {
+        let time_changed = time_changed.timestamp();
 
         // TODO optimize this query
         // 1. The lookup for a device could be replaced with a subquery, although Diesel seems to
@@ -99,17 +101,18 @@ impl gpodder::EpisodeActionRepository for SqliteRepository {
             Ok::<_, diesel::result::Error>(())
         })?;
 
-        Ok(time_changed + 1)
+        Ok(())
     }
 
     fn episode_actions_for_user(
         &self,
         user: &gpodder::User,
-        since: Option<i64>,
+        since: Option<DateTime<Utc>>,
         podcast: Option<String>,
         device: Option<String>,
         aggregated: bool,
-    ) -> Result<(i64, Vec<gpodder::EpisodeAction>), gpodder::AuthErr> {
+    ) -> Result<Vec<gpodder::EpisodeAction>, gpodder::AuthErr> {
+        let since = since.map(|ts| ts.timestamp()).unwrap_or(0);
         let conn = &mut self.pool.get()?;
 
         let mut query = episode_actions::table
@@ -117,7 +120,7 @@ impl gpodder::EpisodeActionRepository for SqliteRepository {
             .filter(
                 episode_actions::user_id
                     .eq(user.id)
-                    .and(episode_actions::time_changed.ge(since.unwrap_or(0))),
+                    .and(episode_actions::time_changed.ge(since)),
             )
             .select((
                 devices::device_id.nullable(),
@@ -157,16 +160,11 @@ impl gpodder::EpisodeActionRepository for SqliteRepository {
             query.get_results(conn)?
         };
 
-        let max_timestamp = db_actions
-            .iter()
-            .map(|(_, a)| a.time_changed)
-            .max()
-            .unwrap_or(0);
         let actions = db_actions
             .into_iter()
             .map(gpodder::EpisodeAction::from)
             .collect();
 
-        Ok((max_timestamp + 1, actions))
+        Ok(actions)
     }
 }
diff --git a/src/gpodder/mod.rs b/src/gpodder/mod.rs
index 18f23b2..0e89cb9 100644
--- a/src/gpodder/mod.rs
+++ b/src/gpodder/mod.rs
@@ -1,6 +1,7 @@
 pub mod models;
 mod repository;
 
+use chrono::{DateTime, Utc};
 pub use models::*;
 pub use repository::GpodderRepository;
 
@@ -11,9 +12,15 @@ pub enum AuthErr {
     Other(Box<dyn std::error::Error + Sync + Send>),
 }
 
-pub trait Store: AuthStore + DeviceRepository + SubscriptionRepository {}
+pub trait Store:
+    AuthStore + DeviceRepository + SubscriptionRepository + EpisodeActionRepository
+{
+}
 
-impl<T> Store for T where T: AuthStore + DeviceRepository + SubscriptionRepository {}
+impl<T> Store for T where
+    T: AuthStore + DeviceRepository + SubscriptionRepository + EpisodeActionRepository
+{
+}
 
 pub trait AuthRepository {
     /// Validate the given session ID and return its user.
@@ -78,7 +85,7 @@ pub trait SubscriptionRepository {
         user: &User,
         device_id: &str,
         urls: Vec<String>,
-        time_changed: chrono::DateTime<chrono::Utc>,
+        time_changed: DateTime<Utc>,
     ) -> Result<(), AuthErr>;
 
     /// Update the list of subscriptions for a device by adding and removing the given URLs
@@ -88,7 +95,7 @@ pub trait SubscriptionRepository {
         device_id: &str,
         add: Vec<String>,
         remove: Vec<String>,
-        time_changed: chrono::DateTime<chrono::Utc>,
+        time_changed: DateTime<Utc>,
     ) -> Result<(), AuthErr>;
 
     /// Returns the changes in subscriptions since the given timestamp.
@@ -96,22 +103,26 @@ pub trait SubscriptionRepository {
         &self,
         user: &User,
         device_id: &str,
-        since: chrono::DateTime<chrono::Utc>,
-    ) -> Result<(chrono::DateTime<chrono::Utc>, Vec<String>, Vec<String>), AuthErr>;
+        since: DateTime<Utc>,
+    ) -> Result<(DateTime<Utc>, Vec<String>, Vec<String>), AuthErr>;
 }
 
 pub trait EpisodeActionRepository {
     /// Insert the given episode actions into the datastore.
-    fn add_episode_actions(&self, user: &User, actions: Vec<EpisodeAction>)
-        -> Result<i64, AuthErr>;
+    fn add_episode_actions(
+        &self,
+        user: &User,
+        actions: Vec<EpisodeAction>,
+        time_changed: DateTime<Utc>,
+    ) -> Result<(), AuthErr>;
 
     /// Retrieve the list of episode actions for the given user.
     fn episode_actions_for_user(
         &self,
         user: &User,
-        since: Option<i64>,
+        since: Option<DateTime<Utc>>,
         podcast: Option<String>,
         device: Option<String>,
         aggregated: bool,
-    ) -> Result<(i64, Vec<EpisodeAction>), AuthErr>;
+    ) -> Result<Vec<EpisodeAction>, AuthErr>;
 }
diff --git a/src/gpodder/models.rs b/src/gpodder/models.rs
index 2ecb004..1c9e550 100644
--- a/src/gpodder/models.rs
+++ b/src/gpodder/models.rs
@@ -1,4 +1,4 @@
-use chrono::{DateTime, NaiveDateTime, Utc};
+use chrono::{DateTime, Utc};
 use serde::{Deserialize, Serialize};
 
 #[derive(Clone)]
@@ -52,7 +52,8 @@ pub enum EpisodeActionType {
 pub struct EpisodeAction {
     pub podcast: String,
     pub episode: String,
-    pub timestamp: Option<NaiveDateTime>,
+    pub timestamp: Option<DateTime<Utc>>,
+    pub time_changed: DateTime<Utc>,
     #[serde(default)]
     pub device: Option<String>,
     #[serde(flatten)]
diff --git a/src/gpodder/repository.rs b/src/gpodder/repository.rs
index e0d9d12..9913c9d 100644
--- a/src/gpodder/repository.rs
+++ b/src/gpodder/repository.rs
@@ -1,6 +1,7 @@
 use std::sync::Arc;
 
 use argon2::{Argon2, PasswordHash, PasswordVerifier};
+use chrono::{DateTime, TimeDelta, Utc};
 use rand::Rng;
 
 use super::{models, AuthErr, Store};
@@ -26,9 +27,7 @@ impl GpodderRepository {
             .ok_or(AuthErr::UnknownSession)?;
 
         // Expired sessions still in the database are considered removed
-        if chrono::Utc::now() - session.last_seen
-            > chrono::TimeDelta::new(MAX_SESSION_AGE, 0).unwrap()
-        {
+        if Utc::now() - session.last_seen > TimeDelta::new(MAX_SESSION_AGE, 0).unwrap() {
             Err(AuthErr::UnknownSession)
         } else {
             Ok(session)
@@ -57,7 +56,7 @@ impl GpodderRepository {
     pub fn create_session(&self, user: &models::User) -> Result<models::Session, AuthErr> {
         let session = models::Session {
             id: rand::thread_rng().gen(),
-            last_seen: chrono::Utc::now(),
+            last_seen: Utc::now(),
             user: user.clone(),
         };
 
@@ -100,13 +99,13 @@ impl GpodderRepository {
         user: &models::User,
         device_id: &str,
         urls: Vec<String>,
-    ) -> Result<chrono::DateTime<chrono::Utc>, AuthErr> {
-        let time_changed = chrono::Utc::now();
+    ) -> Result<DateTime<Utc>, AuthErr> {
+        let time_changed = Utc::now();
 
         self.store
             .set_subscriptions_for_device(user, device_id, urls, time_changed)?;
 
-        Ok(time_changed + chrono::TimeDelta::seconds(1))
+        Ok(time_changed + TimeDelta::seconds(1))
     }
 
     pub fn update_subscriptions_for_device(
@@ -115,29 +114,55 @@ impl GpodderRepository {
         device_id: &str,
         add: Vec<String>,
         remove: Vec<String>,
-    ) -> Result<chrono::DateTime<chrono::Utc>, AuthErr> {
-        let time_changed = chrono::Utc::now();
+    ) -> Result<DateTime<Utc>, AuthErr> {
+        let time_changed = Utc::now();
 
         self.store
             .update_subscriptions_for_device(user, device_id, add, remove, time_changed)?;
 
-        Ok(time_changed + chrono::TimeDelta::seconds(1))
+        Ok(time_changed + TimeDelta::seconds(1))
     }
 
     pub fn subscription_updates_for_device(
         &self,
         user: &models::User,
         device_id: &str,
-        since: chrono::DateTime<chrono::Utc>,
-    ) -> Result<(chrono::DateTime<chrono::Utc>, Vec<String>, Vec<String>), AuthErr> {
+        since: DateTime<Utc>,
+    ) -> Result<(DateTime<Utc>, Vec<String>, Vec<String>), AuthErr> {
         let (max_time_changed, added, removed) = self
             .store
             .subscription_updates_for_device(user, device_id, since)?;
 
-        Ok((
-            max_time_changed + chrono::TimeDelta::seconds(1),
-            added,
-            removed,
-        ))
+        Ok((max_time_changed + TimeDelta::seconds(1), added, removed))
+    }
+
+    pub fn add_episode_actions(
+        &self,
+        user: &models::User,
+        actions: Vec<models::EpisodeAction>,
+    ) -> Result<DateTime<Utc>, AuthErr> {
+        let time_changed = Utc::now();
+
+        self.store
+            .add_episode_actions(user, actions, time_changed)?;
+
+        Ok(time_changed + TimeDelta::seconds(1))
+    }
+
+    pub fn episode_actions_for_user(
+        &self,
+        user: &models::User,
+        since: Option<DateTime<Utc>>,
+        podcast: Option<String>,
+        device: Option<String>,
+        aggregated: bool,
+    ) -> Result<(DateTime<Utc>, Vec<models::EpisodeAction>), AuthErr> {
+        let now = chrono::Utc::now();
+        let actions = self
+            .store
+            .episode_actions_for_user(user, since, podcast, device, aggregated)?;
+        let max_time_changed = actions.iter().map(|a| a.time_changed).max().unwrap_or(now);
+
+        Ok((max_time_changed + TimeDelta::seconds(1), actions))
     }
 }
diff --git a/src/server/gpodder/advanced/episodes.rs b/src/server/gpodder/advanced/episodes.rs
index b862b9c..22839c0 100644
--- a/src/server/gpodder/advanced/episodes.rs
+++ b/src/server/gpodder/advanced/episodes.rs
@@ -4,10 +4,11 @@ use axum::{
     routing::post,
     Extension, Json, Router,
 };
+use chrono::DateTime;
 use serde::{Deserialize, Serialize};
 
 use crate::{
-    gpodder::{self, EpisodeActionRepository},
+    gpodder,
     server::{
         error::{AppError, AppResult},
         gpodder::{
@@ -43,12 +44,12 @@ async fn post_episode_actions(
     }
 
     Ok(
-        tokio::task::spawn_blocking(move || ctx.repo.add_episode_actions(&user, actions))
+        tokio::task::spawn_blocking(move || ctx.store.add_episode_actions(&user, actions))
             .await
             .unwrap()
-            .map(|timestamp| {
+            .map(|time_changed| {
                 Json(UpdatedUrlsResponse {
-                    timestamp,
+                    timestamp: time_changed.timestamp(),
                     update_urls: Vec::new(),
                 })
             })?,
@@ -84,10 +85,15 @@ async fn get_episode_actions(
         return Err(AppError::BadRequest);
     }
 
+    let since = filter
+        .since
+        .map(|ts| DateTime::from_timestamp(ts, 0))
+        .flatten();
+
     Ok(tokio::task::spawn_blocking(move || {
-        ctx.repo.episode_actions_for_user(
+        ctx.store.episode_actions_for_user(
             &user,
-            filter.since,
+            since,
             filter.podcast,
             filter.device,
             filter.aggregated,
@@ -95,5 +101,10 @@ async fn get_episode_actions(
     })
     .await
     .unwrap()
-    .map(|(timestamp, actions)| Json(EpisodeActionsResponse { timestamp, actions }))?)
+    .map(|(ts, actions)| {
+        Json(EpisodeActionsResponse {
+            timestamp: ts.timestamp(),
+            actions,
+        })
+    })?)
 }
diff --git a/src/server/mod.rs b/src/server/mod.rs
index 0a88fd6..93ac8d3 100644
--- a/src/server/mod.rs
+++ b/src/server/mod.rs
@@ -6,7 +6,6 @@ use tower_http::trace::TraceLayer;
 
 #[derive(Clone)]
 pub struct Context {
-    pub repo: crate::db::SqliteRepository,
     pub store: crate::gpodder::GpodderRepository,
 }