Current Players in Classic XI Cause Duplicate Player Bug During Club Transfer

Description:

There is a serious database bug involving current players who are still included in Classic XI.

Steps to reproduce:

1. Go to Club Transfer.

2. Transfer a current player who is also assigned to Classic XI.

3. Complete the transfer.

Expected result:

The player should move to the new club normally, with only one version of the player existing in the database.

Actual result:

The player becomes duplicated. One version stays with the original team (or Classic XI), while another appears at the new club. The same player exists in two teams at the same time.

Suggested fix:

- Remove all active current players from Classic XI, or

- Separate Classic XI data from the current player database so transfers do not create duplicate players.

- Ensure players assigned to Classic XI can still be transferred normally without creating duplicate records.

This issue affects database consistency and should be fixed permanently in a future update.