added categorization visualization and itmeline

src/migrations/add_category_history.py

@@ -0,0 +1,40 @@
+#!/usr/bin/env python3
+"""
+Migration script to add CategoryHistory table to existing databases.
+Run this once to upgrade your database schema.
+"""
+
+import sys
+from pathlib import Path
+
+# Add parent directory to path to import modules
+sys.path.insert(0, str(Path(__file__).parent.parent))
+
+from database import get_database, DatabaseManager
+from models import Base, CategoryHistory
+
+
+def migrate():
+    """Create CategoryHistory table if it doesn't exist."""
+    print("Starting migration: Adding CategoryHistory table...")
+    
+    try:
+        db = get_database()
+        
+        # Initialize database if not already done
+        if not db._initialized:
+            db.initialize()
+        
+        # Create only the CategoryHistory table
+        CategoryHistory.__table__.create(db._engine, checkfirst=True)
+        
+        print("✓ Migration completed successfully!")
+        print("  - CategoryHistory table created")
+        
+    except Exception as e:
+        print(f"✗ Migration failed: {e}")
+        sys.exit(1)
+
+
+if __name__ == "__main__":
+    migrate()