PGP key silently removed for unknown reason

At some point between March 15, 2021 and May 13, 2021, the primary PGP key for [my Keybase account][1] has been silently removed. I do not know when exactly or why that happened. Only the PGP key is missing - things like service associations (GitHub, Twitter, etc.) are still there. I have never received any email about my PGP key being removed. I have also never used the Keybase CLI application.

I cannot re-upload my PGP key with bash + GPG + cURL because I always get the following error:

```
Error in your post
-------------------

Code: 1007
Name: SIG_ELDEST_WITH_LIVE
Description: DB error
```

This does *not* look like a duplicate of #3048 because my PGP key is still not set despite multiple efforts to submit it.

Please let me know if I can supply any further information that would be helpful in resolving this issue.

[1]: https://keybase.io/kempniu

Start by reproducing the PGP-key upload through bash, GPG, and cURL using the reported account and inspect the SIG_ELDEST_WITH_LIVE (1007) response. Done means determining why the key disappeared and why re-uploading fails, then confirming that the primary PGP key can be restored.

Written by the indexing model from the issue text.