Multiple person working on the same project.

**Describe the bug**
When two users are working on one project simultaneously, it will create problems to synchronize their efforts.

**To Reproduce**
Steps to reproduce the behavior:
1. Open two accounts and edit the same table at the same time.

**Expected behavior**
The system should either allow one user to edit at one time or handle synchronized operations.

1. One user will lock the document when editing the project. This user will be logged out automatically after some timeout.
2. Support simultaneous edit to the same file.

**Screenshots**
If applicable, add screenshots to help explain your problem.

**Environment (please complete the following information):**
- OS: [e.g. iOS]
- Version [e.g. 22]
- Node Versions or other

**Additional context**
Add any other context about the problem here.

Start by reproducing the issue with two accounts editing the same table simultaneously, as described in the report. Compare the two proposed directions—single-user locking with timeout or simultaneous synchronized editing—and define which behavior the project should support. Done means concurrent editing no longer causes unsynchronized work or conflicting changes.

Written by the indexing model from the issue text.