feat: add delete backup functionality with confirmation dialog

src-tauri/src/commands/import_export.rs

@@ -168,3 +168,9 @@ pub fn rename_db_backup(
 ) -> Result<String, String> {
     Database::rename_backup(&oldFilename, &newName).map_err(|e| e.to_string())
 }
+
+/// Delete a database backup file
+#[tauri::command]
+pub fn delete_db_backup(filename: String) -> Result<(), String> {
+    Database::delete_backup(&filename).map_err(|e| e.to_string())
+}

src-tauri/src/database/backup.rs

@@ -531,4 +531,29 @@ impl Database {
         log::info!("Renamed backup: {old_filename} -> {new_filename}");
         Ok(new_filename)
     }
+
+    /// Delete a backup file permanently.
+    pub fn delete_backup(filename: &str) -> Result<(), AppError> {
+        // Validate filename (path traversal + .db suffix)
+        if filename.contains("..")
+            || filename.contains('/')
+            || filename.contains('\\')
+            || !filename.ends_with(".db")
+        {
+            return Err(AppError::InvalidInput(
+                "Invalid backup filename".to_string(),
+            ));
+        }
+
+        let backup_path = get_app_config_dir().join("backups").join(filename);
+        if !backup_path.exists() {
+            return Err(AppError::InvalidInput(format!(
+                "Backup file not found: {filename}"
+            )));
+        }
+
+        fs::remove_file(&backup_path).map_err(|e| AppError::io(&backup_path, e))?;
+        log::info!("Deleted backup: {filename}");
+        Ok(())
+    }
 }

src-tauri/src/lib.rs

@@ -911,9 +911,11 @@ pub fn run() {
             commands::save_file_dialog,
             commands::open_file_dialog,
             commands::open_zip_file_dialog,
+            commands::create_db_backup,
             commands::list_db_backups,
             commands::restore_db_backup,
             commands::rename_db_backup,
+            commands::delete_db_backup,
             commands::sync_current_providers_live,
             // Deep link import
             commands::parse_deeplink,