diff --git a/database.py b/database.py
index c6ed79e..f58cc71 100644
--- a/database.py
+++ b/database.py
@@ -114,11 +114,13 @@ class DatabaseManager:
             ''')
             
             # Photo-Tag linkage table
+            # linkage_type: INTEGER enum → 0 = single (per-photo add), 1 = bulk (folder-wide add)
             cursor.execute('''
                 CREATE TABLE IF NOT EXISTS phototaglinkage (
                     linkage_id INTEGER PRIMARY KEY AUTOINCREMENT,
                     photo_id INTEGER NOT NULL,
                     tag_id INTEGER NOT NULL,
+                    linkage_type INTEGER NOT NULL DEFAULT 0 CHECK(linkage_type IN (0,1)),
                     created_date DATETIME DEFAULT CURRENT_TIMESTAMP,
                     FOREIGN KEY (photo_id) REFERENCES photos (id),
                     FOREIGN KEY (tag_id) REFERENCES tags (id),
@@ -136,23 +138,7 @@ class DatabaseManager:
             cursor.execute('CREATE INDEX IF NOT EXISTS idx_photos_date_taken ON photos(date_taken)')
             cursor.execute('CREATE INDEX IF NOT EXISTS idx_photos_date_added ON photos(date_added)')
             
-            # Migration: Add date_taken column to existing photos table if it doesn't exist
-            try:
-                cursor.execute('ALTER TABLE photos ADD COLUMN date_taken DATE')
-                if self.verbose >= 1:
-                    print("✅ Added date_taken column to photos table")
-            except Exception:
-                # Column already exists, ignore
-                pass
             
-            # Migration: Add date_added column to existing photos table if it doesn't exist
-            try:
-                cursor.execute('ALTER TABLE photos ADD COLUMN date_added DATETIME DEFAULT CURRENT_TIMESTAMP')
-                if self.verbose >= 1:
-                    print("✅ Added date_added column to photos table")
-            except Exception:
-                # Column already exists, ignore
-                pass
             
         if self.verbose >= 1:
             print(f"✅ Database initialized: {self.db_path}")