Rework flow/preview_start endpoint to take a number of days since last seen on

[rowanseymour]

No description provided.

[codecov]

Codecov Report

Merging #624 (eef24e5) into main (8b99efd) will decrease coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #624      +/-   ##
==========================================
- Coverage   62.01%   61.99%   -0.03%     
==========================================
  Files         130      130              
  Lines       12859    12859              
==========================================
- Hits         7975     7972       -3     
- Misses       4029     4031       +2     
- Partials      855      856       +1     

Impacted Files	Coverage Δ
core/search/queries.go	94.00% <100.00%> (ø)
web/flow/start.go	75.67% <100.00%> (ø)
core/models/msgs.go	58.29% <0.00%> (-0.43%)	⬇️

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