Record first-reply timings for tickets

[rowanseymour]

No description provided.

[codecov]

Codecov Report

Merging #629 (3a6fd21) into main (636a27d) will decrease coverage by 0.00%.
The diff coverage is 67.85%.

@@            Coverage Diff             @@
##             main     #629      +/-   ##
==========================================
- Coverage   61.96%   61.96%   -0.01%     
==========================================
  Files         131      132       +1     
  Lines       12879    12925      +46     
==========================================
+ Hits         7981     8009      +28     
- Misses       4038     4050      +12     
- Partials      860      866       +6     

Impacted Files	Coverage Δ
core/models/msgs.go	57.39% <30.43%> (-0.60%)	⬇️
core/models/tickets.go	68.17% <62.50%> (-1.64%)	⬇️
core/models/counts.go	94.59% <94.59%> (ø)

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