Every time I try to sync my dev org, DevOps Center gets stuck on "Cloning repository"

**Describe the bug**
Every time I try to sync my dev org, DevOps Center gets stuck on "Cloning repository". Eventually this times out (after a few hours) but during this time, it blocks all movement to our integration stage.

What can we do to resolve this issue?

**To Reproduce**
Steps to reproduce the behavior:
1. Click Sync to backfill my dev org
2. Choose only changed items and run local tests.
3. Wait
...

**Expected behavior**
Should backfill and complete with error or success. Even if the backfill completes successfully (by inspecting the deployment status in my dev org), it still shows an error (see below).

**Screenshots**
NA

**Additional context**
A similar issue affects multiple users but not all. It also appears that this sometimes locks up the entire DevOps Center from promoting any changes (greys out the checkboxes) until a timeout occurs.

Here's a partial response I sent to Francisco about about 1 month ago regarding the problem:

> Just now (well, a few hours ago), I received a message that said "Synchronization Failed" when I tried to backfill my org, but when I look at the Deployment Status in my dev org, all metadata was deployed and all tests passed. The "deploy" was successful, yet I received the "Synchronization Failed" after some time. It seems the status is not getting updated correctly for some reason.
>
> I took a look at the Async_Operation_Result__c table and there's a lot of records in there that show "In Progress" with a message that reads "Cloning repository". I believe these records are in error. Look at the dates.
>
> select fields(all) from sf_devops__Async_Operation_Result__c where sf_devops__Status__c = 'In Progress' limit 25

It would be nice if you could publish a schema of the tables, and what they are used for, and perhaps some notes about the records that way end users could go in and troubleshoot the problem themselves.