feat(infra): implement config snapshot repository methods

k-tv-backend/infra/src/channel_repository/sqlite.rs

@@ -1,6 +1,9 @@
 use async_trait::async_trait;
+use chrono::{DateTime, Utc};
+use sqlx::Row;
+use uuid::Uuid;
 
-use domain::{Channel, ChannelId, ChannelRepository, DomainError, DomainResult, UserId};
+use domain::{Channel, ChannelConfigSnapshot, ChannelId, ChannelRepository, DomainError, DomainResult, ScheduleConfig, ScheduleConfigCompat, UserId};
 
 use super::mapping::{ChannelRow, SELECT_COLS};
 
@@ -139,4 +142,129 @@ impl ChannelRepository for SqliteChannelRepository {
 
         Ok(())
     }
+
+    async fn save_config_snapshot(
+        &self,
+        channel_id: ChannelId,
+        config: &ScheduleConfig,
+        label: Option<String>,
+    ) -> DomainResult<ChannelConfigSnapshot> {
+        let id = Uuid::new_v4();
+        let now = Utc::now();
+        let config_json = serde_json::to_string(config)
+            .map_err(|e| DomainError::RepositoryError(e.to_string()))?;
+
+        let mut tx = self.pool.begin().await
+            .map_err(|e| DomainError::RepositoryError(e.to_string()))?;
+
+        let version_num: i64 = sqlx::query_scalar(
+            "SELECT COALESCE(MAX(version_num), 0) + 1 FROM channel_config_snapshots WHERE channel_id = ?"
+        )
+        .bind(channel_id.to_string())
+        .fetch_one(&mut *tx)
+        .await
+        .map_err(|e| DomainError::RepositoryError(e.to_string()))?;
+
+        sqlx::query(
+            "INSERT INTO channel_config_snapshots (id, channel_id, config_json, version_num, label, created_at)
+             VALUES (?, ?, ?, ?, ?, ?)"
+        )
+        .bind(id.to_string())
+        .bind(channel_id.to_string())
+        .bind(&config_json)
+        .bind(version_num)
+        .bind(&label)
+        .bind(now.to_rfc3339())
+        .execute(&mut *tx)
+        .await
+        .map_err(|e| DomainError::RepositoryError(e.to_string()))?;
+
+        tx.commit().await.map_err(|e| DomainError::RepositoryError(e.to_string()))?;
+
+        Ok(ChannelConfigSnapshot { id, channel_id, config: config.clone(), version_num, label, created_at: now })
+    }
+
+    async fn list_config_snapshots(
+        &self,
+        channel_id: ChannelId,
+    ) -> DomainResult<Vec<ChannelConfigSnapshot>> {
+        let rows = sqlx::query(
+            "SELECT id, config_json, version_num, label, created_at
+             FROM channel_config_snapshots WHERE channel_id = ?
+             ORDER BY version_num DESC"
+        )
+        .bind(channel_id.to_string())
+        .fetch_all(&self.pool)
+        .await
+        .map_err(|e| DomainError::RepositoryError(e.to_string()))?;
+
+        rows.iter().map(|row| {
+            let id: Uuid = row.get::<String, _>("id").parse()
+                .map_err(|_| DomainError::RepositoryError("bad uuid".into()))?;
+            let config_json: String = row.get("config_json");
+            let config_compat: ScheduleConfigCompat = serde_json::from_str(&config_json)
+                .map_err(|e| DomainError::RepositoryError(e.to_string()))?;
+            let config: ScheduleConfig = config_compat.into();
+            let version_num: i64 = row.get("version_num");
+            let label: Option<String> = row.get("label");
+            let created_at_str: String = row.get("created_at");
+            let created_at = created_at_str.parse::<DateTime<Utc>>()
+                .map_err(|e| DomainError::RepositoryError(e.to_string()))?;
+            Ok(ChannelConfigSnapshot { id, channel_id, config, version_num, label, created_at })
+        }).collect()
+    }
+
+    async fn get_config_snapshot(
+        &self,
+        channel_id: ChannelId,
+        snapshot_id: Uuid,
+    ) -> DomainResult<Option<ChannelConfigSnapshot>> {
+        let row = sqlx::query(
+            "SELECT id, config_json, version_num, label, created_at
+             FROM channel_config_snapshots WHERE id = ? AND channel_id = ?"
+        )
+        .bind(snapshot_id.to_string())
+        .bind(channel_id.to_string())
+        .fetch_optional(&self.pool)
+        .await
+        .map_err(|e| DomainError::RepositoryError(e.to_string()))?;
+
+        match row {
+            None => Ok(None),
+            Some(row) => {
+                let config_json: String = row.get("config_json");
+                let config_compat: ScheduleConfigCompat = serde_json::from_str(&config_json)
+                    .map_err(|e| DomainError::RepositoryError(e.to_string()))?;
+                let config: ScheduleConfig = config_compat.into();
+                let version_num: i64 = row.get("version_num");
+                let label: Option<String> = row.get("label");
+                let created_at_str: String = row.get("created_at");
+                let created_at = created_at_str.parse::<DateTime<Utc>>()
+                    .map_err(|e| DomainError::RepositoryError(e.to_string()))?;
+                Ok(Some(ChannelConfigSnapshot { id: snapshot_id, channel_id, config, version_num, label, created_at }))
+            }
+        }
+    }
+
+    async fn patch_config_snapshot_label(
+        &self,
+        channel_id: ChannelId,
+        snapshot_id: Uuid,
+        label: Option<String>,
+    ) -> DomainResult<Option<ChannelConfigSnapshot>> {
+        let updated = sqlx::query(
+            "UPDATE channel_config_snapshots SET label = ? WHERE id = ? AND channel_id = ? RETURNING id"
+        )
+        .bind(&label)
+        .bind(snapshot_id.to_string())
+        .bind(channel_id.to_string())
+        .fetch_optional(&self.pool)
+        .await
+        .map_err(|e| DomainError::RepositoryError(e.to_string()))?;
+
+        if updated.is_none() {
+            return Ok(None);
+        }
+        self.get_config_snapshot(channel_id, snapshot_id).await
+    }
 }