Fix UI bugs, admin bulk upload limits, test ingestion bugs, and reset demo users

backend/reset_demo_users.py

@@ -0,0 +1,30 @@
+
+from uuid import UUID
+from sqlmodel import Session
+from database import engine
+import models
+from main import ensure_demo_user
+
+demo_ids = [
+    UUID("11111111-1111-1111-1111-111111111111"),
+    UUID("22222222-2222-2222-2222-222222222222"),
+    UUID("33333333-3333-3333-3333-333333333333"),
+    UUID("44444444-4444-4444-4444-444444444444")
+]
+
+with Session(engine) as session:
+    for uid in demo_ids:
+        existing = session.get(models.User, uid)
+        if existing:
+            print(f"Deleting {existing.name}...")
+            session.exec(models.Subscription.__table__.delete().where(models.Subscription.user_id == uid))
+            session.exec(models.Mistake.__table__.delete().where(models.Mistake.user_id == uid))
+            session.exec(models.Attempt.__table__.delete().where(models.Attempt.user_id == uid))
+            session.exec(models.StudyPlan.__table__.delete().where(models.StudyPlan.user_id == uid))
+            session.exec(models.Transaction.__table__.delete().where(models.Transaction.user_id == uid))
+            session.delete(existing)
+            session.commit()
+        
+        user = ensure_demo_user(uid, session)
+        print(f"Recreated: {user.name}")
+