fix some bugs

[stishkin]

• fix queries in timer retention
• do not discard proxy record after proxy state is processed, since that record needs to persist

[codecov-commenter]

Codecov Report

Merging #2406 (3de55e9) into main (f22dee1) will decrease coverage by 0.01%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main    #2406      +/-   ##
==========================================
- Coverage   29.90%   29.88%   -0.02%     
==========================================
  Files         289      289              
  Lines       34905    34921      +16     
==========================================
  Hits        10437    10437              
- Misses      24468    24484      +16     

Impacted Files	Coverage Δ
src/ApiService/ApiService/Functions/TimerProxy.cs	0.00% <0.00%> (ø)
.../ApiService/ApiService/Functions/TimerRetention.cs	0.00% <0.00%> (ø)
src/ApiService/ApiService/UserCredentials.cs	6.66% <0.00%> (ø)
...piService/ApiService/onefuzzlib/ProxyOperations.cs	0.00% <0.00%> (ø)
...c/ApiService/ApiService/onefuzzlib/VmOperations.cs	0.00% <0.00%> (ø)
...rc/ApiService/ApiService/onefuzzlib/orm/Queries.cs	52.94% <0.00%> (-22.06%)	⬇️

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