feat: store user agent with sessions

gpodder/src/models.rs

@@ -56,6 +56,7 @@ pub struct EpisodeAction {
 pub struct Session {
     pub id: i64,
     pub last_seen: DateTime<Utc>,
+    pub user_agent: Option<String>,
     pub user: User,
 }
 

gpodder/src/repository.rs

@@ -71,11 +71,16 @@ impl GpodderRepository {
         }
     }
 
-    pub fn create_session(&self, user: &models::User) -> Result<models::Session, AuthErr> {
+    pub fn create_session(
+        &self,
+        user: &models::User,
+        user_agent: Option<String>,
+    ) -> Result<models::Session, AuthErr> {
         let session = models::Session {
             id: rand::thread_rng().gen(),
             last_seen: Utc::now(),
             user: user.clone(),
+            user_agent,
         };
 
         self.store.insert_session(&session)?;