feat: schedule history — list, detail, rollback endpoints

k-tv-backend/domain/src/services/schedule/mod.rs

@@ -225,6 +225,32 @@ impl ScheduleEngineService {
         self.provider_registry.get_stream_url(item_id, quality).await
     }
 
+    /// List all generated schedule headers for a channel, newest first.
+    pub async fn list_schedule_history(
+        &self,
+        channel_id: ChannelId,
+    ) -> DomainResult<Vec<GeneratedSchedule>> {
+        self.schedule_repo.list_schedule_history(channel_id).await
+    }
+
+    /// Fetch a specific schedule with its slots.
+    pub async fn get_schedule_by_id(
+        &self,
+        channel_id: ChannelId,
+        schedule_id: uuid::Uuid,
+    ) -> DomainResult<Option<GeneratedSchedule>> {
+        self.schedule_repo.get_schedule_by_id(channel_id, schedule_id).await
+    }
+
+    /// Delete all schedules with generation > target_generation for this channel.
+    pub async fn delete_schedules_after(
+        &self,
+        channel_id: ChannelId,
+        target_generation: u32,
+    ) -> DomainResult<()> {
+        self.schedule_repo.delete_schedules_after(channel_id, target_generation).await
+    }
+
     /// Return all slots that overlap the given time window — the EPG data.
     pub fn get_epg(
         schedule: &GeneratedSchedule,