overwriting timestamp values of all "current" app's views after _annotate()

[keighrim]

addresses #269

[codecov]

Codecov Report

❌ Patch coverage is 95.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 60.99%. Comparing base (9dcad01) to head (a30911e).
⚠️ Report is 2 commits behind head on develop.

Files with missing lines	Patch %	Lines
clams/app/__init__.py	88.88%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #271      +/-   ##
===========================================
- Coverage    61.33%   60.99%   -0.34%     
===========================================
  Files            6        6              
  Lines          812      805       -7     
===========================================
- Hits           498      491       -7     
  Misses         314      314              

Flag	Coverage Δ
unittests	60.99% <95.00%> (-0.34%)	⬇️

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