Save a default model per user, set from Settings

internal/store/notifications.go

@@ -25,3 +25,17 @@ func (s *Store) UpdateNotificationPrefs(ctx context.Context, login string, prefs
 	}
 	return s.GetUser(ctx, login)
 }
+
+func (s *Store) UpdateDefaultModel(ctx context.Context, login, model string) (api.User, error) {
+	err := s.write(ctx, func(tx *sql.Tx, emit emitFunc) error {
+		_, err := tx.ExecContext(ctx, `UPDATE users SET default_model = ? WHERE login = ?`, model, login)
+		if err != nil {
+			return err
+		}
+		return emit(api.Event{Kind: "user.updated", Actor: login, Payload: map[string]any{"login": login}})
+	})
+	if err != nil {
+		return api.User{}, err
+	}
+	return s.GetUser(ctx, login)
+}