diff --git a/.idea/WalkFiles.iml b/.idea/WalkFiles.iml
index 3786a27..6cb8b9a 100644
--- a/.idea/WalkFiles.iml
+++ b/.idea/WalkFiles.iml
@@ -4,7 +4,7 @@
     <content url="file://$MODULE_DIR$">
       <excludeFolder url="file://$MODULE_DIR$/.venv" />
     </content>
-    <orderEntry type="jdk" jdkName="Python 3.13 (walkfiles)" jdkType="Python SDK" />
+    <orderEntry type="jdk" jdkName="Python 3.12" jdkType="Python SDK" />
     <orderEntry type="sourceFolder" forTests="false" />
   </component>
 </module>
\ No newline at end of file
diff --git a/22 WalkandSave.py b/22 WalkandSave.py
index 8bf2f4f..7ab97c5 100644
--- a/22 WalkandSave.py	
+++ b/22 WalkandSave.py	
@@ -169,28 +169,59 @@ def load_folder_state(cursor, device_id: int):
     return out
 
 
-def get_or_create_folder(cursor, conn, folder_state, device_id, folder_path, parent_path, now):
-    if folder_path in folder_state:
-        folder_id = folder_state[folder_path]["id"]
-        cursor.execute(
-            "UPDATE folders SET last_seen=%s, deleted=0 WHERE id=%s",
-            (now, folder_id)
-        )
-        folder_state[folder_path]["deleted"] = 0
+import unicodedata
+
+import unicodedata
+from datetime import datetime
+
+def get_or_create_folder(cursor, conn, folder_state, device_id, folder_path, parent_id):
+    # Normalize Unicode to avoid Černý vs Černý issue
+    folder_path = unicodedata.normalize("NFC", folder_path)
+
+    # Cache key is folder_path
+    key = folder_path
+
+    # 1) If we already know this folder → return cached ID
+    if key in folder_state:
+        return folder_state[key]["id"]
+
+    now = datetime.now()
+
+    # 2) Try to SELECT existing record
+    cursor.execute("""
+        SELECT id 
+        FROM folders
+        WHERE device_id = %s AND path = %s
+        LIMIT 1
+    """, (device_id, folder_path))
+    row = cursor.fetchone()
+
+    if row:
+        folder_id = row[0]
+        folder_state[key] = {"id": folder_id, "deleted": 0}
         return folder_id
 
-    parent_id = folder_state.get(parent_path, {}).get("id") if parent_path else None
-
+    # 3) INSERT new folder (idempotent)
     cursor.execute("""
-        INSERT INTO folders (path, parent_id, device_id, first_seen, last_seen, deleted)
-        VALUES (%s, %s, %s, %s, %s, 0)
+        INSERT INTO folders (path, parent_id, device_id, first_seen, last_seen)
+        VALUES (%s, %s, %s, %s, %s)
+        ON DUPLICATE KEY UPDATE 
+            id = LAST_INSERT_ID(id),
+            last_seen = VALUES(last_seen)
     """, (folder_path, parent_id, device_id, now, now))
 
+    conn.commit()
+
     folder_id = cursor.lastrowid
-    folder_state[folder_path] = {"id": folder_id, "deleted": 0}
+
+    # 4) Save to memory cache
+    folder_state[key] = {"id": folder_id, "deleted": 0}
+
     return folder_id
 
 
+
+
 # ======================================================
 # LOAD LAST FILE STATE
 # ======================================================
@@ -225,8 +256,11 @@ def load_last_file_state(cursor, device_id: int):
 def walk_and_store_bulk():
 
     BATCH_SIZE = 10000
-    target_dir = r"\\tower1\#colddata"
-    device_name = "TOWER1"
+    # target_dir = r"\\tower1\#colddata"
+    # target_dir = r"z:"
+    target_dir = r"\\tower\ebooks"
+    # device_name = "TW22"
+    device_name = "TOWER"
 
     if not os.path.isdir(target_dir):
         print("Invalid directory:", target_dir)
@@ -256,12 +290,20 @@ def walk_and_store_bulk():
     # -------------------------------------------------
     for root, dirs, files in os.walk(target_dir):
         folder_path = os.path.normpath(root)
-        parent_path = os.path.normpath(os.path.dirname(root)) if root != target_dir else None
+        # 1️⃣ determine parent_id correctly
+        if root == target_dir:
+            parent_id = None
+        else:
+            parent_folder_path = os.path.normpath(os.path.dirname(root))
+            parent_id = get_or_create_folder(cursor, conn, folder_state,
+                                             device_id, parent_folder_path,
+                                             None)
 
+        # 2️⃣ now insert current folder with correct parent_id
         seen_folders.add(folder_path)
         folder_id = get_or_create_folder(cursor, conn, folder_state,
                                          device_id, folder_path,
-                                         parent_path, now)
+                                         parent_id)
 
         # -------------------------------------------------
         # FILE LOOP
diff --git a/51 MD5Calculate.py b/51 MD5Calculate.py
index c1ad0d7..bd5743a 100644
--- a/51 MD5Calculate.py	
+++ b/51 MD5Calculate.py	
@@ -229,7 +229,7 @@ def run_md5_calculator(device_name=None,
 if __name__ == "__main__":
     # Example usage:
     run_md5_calculator(
-        device_name="TWW11",
+        device_name="TOWER",
         extension="ANY",
         max_size="ANY",
         path_prefix=r"ANY"