daserver memory surges within minutes

[antonio-altr]

Describe the bug
This is related to: #2963
Even after setting GO garbage collection, we still observe daserver hitting OOM within short amount of time.
It's unclear why daserver requires so much GB of memory within a few minutes.

To Reproduce

1. Adjust resource limit for daserver
2. Specify GOGC=80 and GOMEMLIMIT=(90% of memory limit)
3. Run the daserver
4. Repeat steps 1-3 with different resource limits

In a matter of minutes, the daserver memory usage surges and straddles the memory limit line

Expected behavior
As daserver is basically just a storage and signing service, I would not have expected it to require this amount of storage.
So maybe some unnecessary caching is happening under the hood.

Additional context
Here is the log from the point where the final surge occurs in the screenshot.
daserver-log.txt