chore: add timezone migration script

Made-with: Cursor

scripts/migrate_timezones.py

@@ -0,0 +1,29 @@
+from datetime import timezone
+from zoneinfo import ZoneInfo
+from app import create_app, db
+from src.models import Article, Issue
+
+def migrate():
+    app = create_app(start_scheduler=False)
+    local_tz = ZoneInfo("America/New_York")
+    
+    with app.app_context():
+        # Migrate Articles
+        for article in Article.query.all():
+            # Assume existing naive datetime is UTC
+            utc_dt = article.pub_date.replace(tzinfo=timezone.utc)
+            article.pub_date = utc_dt.astimezone(local_tz).replace(tzinfo=None)
+            
+            utc_fetched = article.fetched_at.replace(tzinfo=timezone.utc)
+            article.fetched_at = utc_fetched.astimezone(local_tz).replace(tzinfo=None)
+            
+        # Migrate Issues
+        for issue in Issue.query.all():
+            utc_created = issue.created_at.replace(tzinfo=timezone.utc)
+            issue.created_at = utc_created.astimezone(local_tz).replace(tzinfo=None)
+            
+        db.session.commit()
+        print("Migration complete.")
+
+if __name__ == "__main__":
+    migrate()