feat(domain): extend ChannelRepository and ScheduleRepository ports for history

k-tv-backend/domain/src/repositories.rs

@@ -10,7 +10,7 @@ use chrono::DateTime;
 use chrono::Utc;
 use uuid::Uuid;
 
-use crate::entities::{Channel, GeneratedSchedule, PlaybackRecord, User};
+use crate::entities::{Channel, ChannelConfigSnapshot, GeneratedSchedule, PlaybackRecord, ScheduleConfig, User};
 use crate::errors::DomainResult;
 use crate::value_objects::{BlockId, ChannelId, MediaItemId, UserId};
 
@@ -71,6 +71,33 @@ pub trait ChannelRepository: Send + Sync {
     /// Insert or update a channel.
     async fn save(&self, channel: &Channel) -> DomainResult<()>;
     async fn delete(&self, id: ChannelId) -> DomainResult<()>;
+
+    /// Snapshot the current config before saving a new one.
+    /// version_num is computed by the infra layer as MAX(version_num)+1 inside a transaction.
+    async fn save_config_snapshot(
+        &self,
+        channel_id: ChannelId,
+        config: &ScheduleConfig,
+        label: Option<String>,
+    ) -> DomainResult<ChannelConfigSnapshot>;
+
+    async fn list_config_snapshots(
+        &self,
+        channel_id: ChannelId,
+    ) -> DomainResult<Vec<ChannelConfigSnapshot>>;
+
+    async fn get_config_snapshot(
+        &self,
+        channel_id: ChannelId,
+        snapshot_id: Uuid,
+    ) -> DomainResult<Option<ChannelConfigSnapshot>>;
+
+    async fn patch_config_snapshot_label(
+        &self,
+        channel_id: Uuid,
+        snapshot_id: Uuid,
+        label: Option<String>,
+    ) -> DomainResult<Option<ChannelConfigSnapshot>>;
 }
 
 /// Repository port for `GeneratedSchedule` and `PlaybackRecord` persistence.
@@ -107,6 +134,28 @@ pub trait ScheduleRepository: Send + Sync {
         &self,
         channel_id: ChannelId,
     ) -> DomainResult<HashMap<BlockId, MediaItemId>>;
+
+    /// List all generated schedule headers for a channel, newest first.
+    async fn list_schedule_history(
+        &self,
+        channel_id: ChannelId,
+    ) -> DomainResult<Vec<GeneratedSchedule>>;
+
+    /// Fetch a specific schedule with its slots, verifying channel ownership.
+    async fn get_schedule_by_id(
+        &self,
+        channel_id: ChannelId,
+        schedule_id: Uuid,
+    ) -> DomainResult<Option<GeneratedSchedule>>;
+
+    /// Delete all schedules with generation > target_generation for this channel.
+    /// Also deletes matching playback_records (no DB cascade between those tables).
+    /// scheduled_slots cascade via FK from generated_schedules.
+    async fn delete_schedules_after(
+        &self,
+        channel_id: ChannelId,
+        target_generation: u32,
+    ) -> DomainResult<()>;
 }
 
 /// Repository port for activity log persistence.