fix(release): 完成分发身份与 CAS legacy ownership 收尾

crates/bat-cas-engine/src/refcount.rs

@@ -389,6 +389,17 @@ impl SqliteRefCounter {
         transaction.commit().await?;
         Ok(true)
     }
+
+    /// Returns whether the durable ledger contains any row for an ownership.
+    pub async fn has_release_ownership(&self, ownership_id: &str) -> Result<bool> {
+        let exists: i64 = sqlx::query_scalar(
+            "SELECT EXISTS(SELECT 1 FROM cas_release_references WHERE release_id = ?1)",
+        )
+        .bind(ownership_id)
+        .fetch_one(&self.pool)
+        .await?;
+        Ok(exists != 0)
+    }
 }
 
 #[cfg(test)]

crates/bat-cas-engine/src/repository.rs

@@ -176,6 +176,12 @@ impl FileSystemCasRepository {
             .await
     }
 
+    /// Returns whether the durable release ownership ledger has any row.
+    pub async fn has_release_ownership(&self, ownership_id: &str) -> Result<bool> {
+        let _lock = self.acquire_operation_lock().await?;
+        self.ref_counter.has_release_ownership(ownership_id).await
+    }
+
     /// 获取存储统计信息。
     pub async fn stats(&self) -> Result<StorageStats> {
         let _lock = self.acquire_operation_lock().await?;