diff --git a/src/core/database.py b/src/core/database.py
index 1a344d4..5dfe2d7 100644
--- a/src/core/database.py
+++ b/src/core/database.py
@@ -354,17 +354,29 @@ class DatabaseManager:
                 ''', (limit,))
             return cursor.fetchall()
     
-    def get_unprocessed_photos(self, limit: int = 50) -> List[Tuple]:
-        """Get unprocessed photos"""
+    def get_unprocessed_photos(self, limit: Optional[int] = None) -> List[Tuple]:
+        """Get unprocessed photos
+        
+        Args:
+            limit: Maximum number of photos to return. If None, return all unprocessed photos.
+        """
         with self.get_db_connection() as conn:
             cursor = conn.cursor()
-            cursor.execute('''
-                SELECT id, path, filename, date_taken
-                FROM photos 
-                WHERE processed = 0
-                ORDER BY date_added ASC
-                LIMIT ?
-            ''', (limit,))
+            if limit is None:
+                cursor.execute('''
+                    SELECT id, path, filename, date_taken
+                    FROM photos 
+                    WHERE processed = 0
+                    ORDER BY date_added ASC
+                ''')
+            else:
+                cursor.execute('''
+                    SELECT id, path, filename, date_taken
+                    FROM photos 
+                    WHERE processed = 0
+                    ORDER BY date_added ASC
+                    LIMIT ?
+                ''', (limit,))
             return cursor.fetchall()
     
     def get_unidentified_faces(self, limit: int = 20) -> List[Tuple]:
diff --git a/src/core/face_processing.py b/src/core/face_processing.py
index 3e70bfc..4f98a9e 100644
--- a/src/core/face_processing.py
+++ b/src/core/face_processing.py
@@ -92,11 +92,14 @@ class FaceProcessor:
         # Clear caches
         self._clear_caches()
     
-    def process_faces(self, limit: int = 50, model: str = DEFAULT_FACE_DETECTION_MODEL, progress_callback=None, stop_event=None) -> int:
+    def process_faces(self, limit: Optional[int] = None, model: str = DEFAULT_FACE_DETECTION_MODEL, progress_callback=None, stop_event=None) -> int:
         """Process unprocessed photos for faces
         
         If provided, progress_callback will be called as progress_callback(index, total, filename)
         where index is 1-based count of processed photos so far.
+        
+        Args:
+            limit: Maximum number of photos to process. If None, process all unprocessed photos.
         """
         unprocessed = self.db.get_unprocessed_photos(limit)
         
diff --git a/src/photo_tagger.py b/src/photo_tagger.py
index a42770a..de7ff36 100644
--- a/src/photo_tagger.py
+++ b/src/photo_tagger.py
@@ -84,8 +84,12 @@ class PhotoTagger:
         return self.photo_manager.extract_photo_date(photo_path)
     
     # Face processing methods (delegated)
-    def process_faces(self, limit: int = DEFAULT_PROCESSING_LIMIT, model: str = DEFAULT_FACE_DETECTION_MODEL, progress_callback=None, stop_event=None) -> int:
-        """Process unprocessed photos for faces with optional progress and cancellation"""
+    def process_faces(self, limit: Optional[int] = None, model: str = DEFAULT_FACE_DETECTION_MODEL, progress_callback=None, stop_event=None) -> int:
+        """Process unprocessed photos for faces with optional progress and cancellation
+        
+        Args:
+            limit: Maximum number of photos to process. If None, process all unprocessed photos.
+        """
         return self.face_processor.process_faces(limit, model, progress_callback, stop_event)
     
     def _extract_face_crop(self, photo_path: str, location: dict, face_id: int) -> str: