feat(backend): Add script to fix tour dates

backend/fix_tour_dates.py

@@ -0,0 +1,56 @@
+#!/usr/bin/env python3
+"""
+Fix Tour Dates Script
+Iterates through all Tours, finds their associated shows, and updates
+the tour's start_date and end_date based on the range of show dates.
+"""
+from sqlmodel import Session, select
+from database import engine
+from models import Tour, Show
+from datetime import datetime
+
+def fix_tour_dates():
+    print("="*60)
+    print("FIX TOUR DATES")
+    print("="*60)
+    
+    with Session(engine) as session:
+        tours = session.exec(select(Tour)).all()
+        print(f"Found {len(tours)} tours to process.")
+        
+        updated_count = 0
+        
+        for tour in tours:
+            # Get all shows for this tour
+            shows = session.exec(
+                select(Show).where(Show.tour_id == tour.id)
+            ).all()
+            
+            if not shows:
+                print(f"Skipping '{tour.name}' - No shows found.")
+                continue
+                
+            dates = [s.date for s in shows]
+            min_date = min(dates)
+            max_date = max(dates)
+            
+            # Check if update is needed
+            needs_update = False
+            if tour.start_date != min_date:
+                tour.start_date = min_date
+                needs_update = True
+            
+            if tour.end_date != max_date:
+                tour.end_date = max_date
+                needs_update = True
+                
+            if needs_update:
+                session.add(tour)
+                updated_count += 1
+                print(f"Updated '{tour.name}': {min_date.date()} - {max_date.date()}")
+        
+        session.commit()
+        print(f"\nSuccessfully updated {updated_count} tours.")
+
+if __name__ == "__main__":
+    fix_tour_dates()