rename directory entries

backend/src/lib/outbound/file_system.rs

@@ -1,6 +1,6 @@
 use std::time::UNIX_EPOCH;
 
-use anyhow::{Context, anyhow};
+use anyhow::{Context, anyhow, bail};
 use tokio::{fs, io::AsyncWriteExt as _};
 
 use crate::domain::warren::{
@@ -156,6 +156,10 @@ impl FileSystem {
             FilePath::new(&c)?
         };
 
+        if fs::try_exists(&new_path).await? {
+            bail!("File already exists");
+        }
+
         fs::rename(current_path, &new_path).await?;
 
         Ok(new_path)

backend/src/lib/outbound/metrics_debug_logger.rs

@@ -70,6 +70,13 @@ impl WarrenMetrics for MetricsDebugLogger {
     async fn record_warren_file_deletion_failure(&self) {
         log::debug!("[Metrics] Warren file deletion failed");
     }
+
+    async fn record_warren_entry_rename_success(&self) {
+        log::debug!("[Metrics] Warren entry rename succeeded");
+    }
+    async fn record_warren_entry_rename_failure(&self) {
+        log::debug!("[Metrics] Warren entry rename failed");
+    }
 }
 
 impl FileSystemMetrics for MetricsDebugLogger {

backend/src/lib/outbound/notifier_debug_logger.rs

@@ -71,6 +71,20 @@ impl WarrenNotifier for NotifierDebugLogger {
             warren.name(),
         );
     }
+
+    async fn warren_entry_renamed(
+        &self,
+        warren: &Warren,
+        old_path: &crate::domain::warren::models::file::AbsoluteFilePath,
+        new_path: &FilePath,
+    ) {
+        log::debug!(
+            "[Notifier] Renamed file {} to {} in warren {}",
+            old_path,
+            new_path,
+            warren.name(),
+        );
+    }
 }
 
 impl FileSystemNotifier for NotifierDebugLogger {