feat: schedule history — list, detail, rollback endpoints

k-tv-backend/api/src/dto.rs

@@ -180,6 +180,34 @@ impl From<domain::Channel> for ChannelResponse {
     }
 }
 
+// ============================================================================
+// Config history DTOs
+// ============================================================================
+
+#[derive(Debug, Serialize)]
+pub struct ConfigSnapshotResponse {
+    pub id: Uuid,
+    pub version_num: i64,
+    pub label: Option<String>,
+    pub created_at: DateTime<Utc>,
+}
+
+impl From<domain::ChannelConfigSnapshot> for ConfigSnapshotResponse {
+    fn from(s: domain::ChannelConfigSnapshot) -> Self {
+        Self {
+            id: s.id,
+            version_num: s.version_num,
+            label: s.label,
+            created_at: s.created_at,
+        }
+    }
+}
+
+#[derive(Debug, Deserialize)]
+pub struct PatchSnapshotRequest {
+    pub label: Option<String>,
+}
+
 // ============================================================================
 // EPG / playback DTOs
 // ============================================================================
@@ -305,6 +333,27 @@ pub struct TranscodeStatsResponse {
     pub item_count: usize,
 }
 
+#[derive(Debug, Serialize)]
+pub struct ScheduleHistoryEntry {
+    pub id: Uuid,
+    pub generation: u32,
+    pub valid_from: DateTime<Utc>,
+    pub valid_until: DateTime<Utc>,
+    pub slot_count: usize,
+}
+
+impl From<domain::GeneratedSchedule> for ScheduleHistoryEntry {
+    fn from(s: domain::GeneratedSchedule) -> Self {
+        Self {
+            id: s.id,
+            generation: s.generation,
+            valid_from: s.valid_from,
+            valid_until: s.valid_until,
+            slot_count: s.slots.len(),
+        }
+    }
+}
+
 impl From<domain::GeneratedSchedule> for ScheduleResponse {
     fn from(s: domain::GeneratedSchedule) -> Self {
         Self {