feat: config history — auto-snapshot on update, list/pin/restore endpoints

k-tv-backend/api/src/routes/channels/config_history.rs

@@ -0,0 +1,72 @@
+use axum::{
+    Json,
+    extract::{Path, State},
+    http::StatusCode,
+    response::IntoResponse,
+};
+use uuid::Uuid;
+
+use crate::{
+    dto::{ChannelResponse, ConfigSnapshotResponse, PatchSnapshotRequest},
+    error::ApiError,
+    extractors::CurrentUser,
+    state::AppState,
+};
+
+use super::require_owner;
+
+pub(super) async fn list_config_history(
+    State(state): State<AppState>,
+    CurrentUser(user): CurrentUser,
+    Path(channel_id): Path<Uuid>,
+) -> Result<impl IntoResponse, ApiError> {
+    let channel = state.channel_service.find_by_id(channel_id).await?;
+    require_owner(&channel, user.id)?;
+
+    let snapshots = state.channel_service.list_config_snapshots(channel_id).await?;
+    let response: Vec<ConfigSnapshotResponse> = snapshots.into_iter().map(Into::into).collect();
+    Ok(Json(response))
+}
+
+pub(super) async fn patch_config_snapshot(
+    State(state): State<AppState>,
+    CurrentUser(user): CurrentUser,
+    Path((channel_id, snap_id)): Path<(Uuid, Uuid)>,
+    Json(payload): Json<PatchSnapshotRequest>,
+) -> Result<impl IntoResponse, ApiError> {
+    let channel = state.channel_service.find_by_id(channel_id).await?;
+    require_owner(&channel, user.id)?;
+
+    let updated = state
+        .channel_service
+        .patch_config_snapshot_label(channel_id, snap_id, payload.label)
+        .await?
+        .ok_or_else(|| ApiError::NotFound("Snapshot not found".into()))?;
+
+    Ok(Json(ConfigSnapshotResponse::from(updated)))
+}
+
+pub(super) async fn restore_config_snapshot(
+    State(state): State<AppState>,
+    CurrentUser(user): CurrentUser,
+    Path((channel_id, snap_id)): Path<(Uuid, Uuid)>,
+) -> Result<impl IntoResponse, ApiError> {
+    let channel = state.channel_service.find_by_id(channel_id).await?;
+    require_owner(&channel, user.id)?;
+
+    let updated = state
+        .channel_service
+        .restore_config_snapshot(channel_id, snap_id)
+        .await
+        .map_err(|e| match e {
+            domain::DomainError::ChannelNotFound(_) => ApiError::NotFound("Snapshot not found".into()),
+            other => ApiError::from(other),
+        })?;
+
+    let _ = state
+        .activity_log_repo
+        .log("config_restored", &snap_id.to_string(), Some(channel_id))
+        .await;
+
+    Ok((StatusCode::OK, Json(ChannelResponse::from(updated))))
+}

k-tv-backend/api/src/routes/channels/mod.rs

@@ -13,6 +13,7 @@ use domain::{AccessMode, User};
 use crate::{error::ApiError, state::AppState};
 
 mod broadcast;
+mod config_history;
 mod crud;
 mod schedule;
 
@@ -39,6 +40,18 @@ pub fn router() -> Router<AppState> {
         .route("/{id}/now", get(broadcast::get_current_broadcast))
         .route("/{id}/epg", get(broadcast::get_epg))
         .route("/{id}/stream", get(broadcast::get_stream))
+        .route(
+            "/{id}/config/history",
+            get(config_history::list_config_history),
+        )
+        .route(
+            "/{id}/config/history/{snap_id}",
+            axum::routing::patch(config_history::patch_config_snapshot),
+        )
+        .route(
+            "/{id}/config/history/{snap_id}/restore",
+            post(config_history::restore_config_snapshot),
+        )
 }
 
 // ============================================================================

k-tv-backend/domain/src/services/channel.rs

@@ -1,6 +1,8 @@
 use std::sync::Arc;
 
-use crate::entities::Channel;
+use uuid::Uuid;
+
+use crate::entities::{Channel, ChannelConfigSnapshot, ScheduleConfig};
 use crate::errors::{DomainError, DomainResult};
 use crate::repositories::ChannelRepository;
 use crate::value_objects::{ChannelId, UserId};
@@ -42,10 +44,73 @@ impl ChannelService {
     }
 
     pub async fn update(&self, channel: Channel) -> DomainResult<Channel> {
+        // Auto-snapshot the config being replaced
+        self.channel_repo
+            .save_config_snapshot(channel.id, &channel.schedule_config, None)
+            .await?;
         self.channel_repo.save(&channel).await?;
         Ok(channel)
     }
 
+    pub async fn list_config_snapshots(
+        &self,
+        channel_id: ChannelId,
+    ) -> DomainResult<Vec<ChannelConfigSnapshot>> {
+        self.channel_repo.list_config_snapshots(channel_id).await
+    }
+
+    pub async fn get_config_snapshot(
+        &self,
+        channel_id: ChannelId,
+        snapshot_id: Uuid,
+    ) -> DomainResult<Option<ChannelConfigSnapshot>> {
+        self.channel_repo.get_config_snapshot(channel_id, snapshot_id).await
+    }
+
+    pub async fn patch_config_snapshot_label(
+        &self,
+        channel_id: ChannelId,
+        snapshot_id: Uuid,
+        label: Option<String>,
+    ) -> DomainResult<Option<ChannelConfigSnapshot>> {
+        self.channel_repo.patch_config_snapshot_label(channel_id, snapshot_id, label).await
+    }
+
+    /// Restore a snapshot: auto-snapshot current config, then apply the snapshot's config.
+    pub async fn restore_config_snapshot(
+        &self,
+        channel_id: ChannelId,
+        snapshot_id: Uuid,
+    ) -> DomainResult<Channel> {
+        let snapshot = self
+            .channel_repo
+            .get_config_snapshot(channel_id, snapshot_id)
+            .await?
+            .ok_or(DomainError::ChannelNotFound(channel_id))?;
+        let mut channel = self
+            .channel_repo
+            .find_by_id(channel_id)
+            .await?
+            .ok_or(DomainError::ChannelNotFound(channel_id))?;
+        // Snapshot current config before overwriting
+        self.channel_repo
+            .save_config_snapshot(channel_id, &channel.schedule_config, None)
+            .await?;
+        channel.schedule_config = snapshot.config;
+        channel.updated_at = chrono::Utc::now();
+        self.channel_repo.save(&channel).await?;
+        Ok(channel)
+    }
+
+    pub async fn save_config_snapshot(
+        &self,
+        channel_id: ChannelId,
+        config: &ScheduleConfig,
+        label: Option<String>,
+    ) -> DomainResult<ChannelConfigSnapshot> {
+        self.channel_repo.save_config_snapshot(channel_id, config, label).await
+    }
+
     /// Delete a channel, enforcing that `requester_id` is the owner.
     pub async fn delete(&self, id: ChannelId, requester_id: UserId) -> DomainResult<()> {
         let channel = self.find_by_id(id).await?;