[WIP] Changes to backend for notifications

[usmanmuhd]

Backend for #2967
Refs: #2404

[codecov]

Codecov Report

Merging #3083 into new-notifications will decrease coverage by 12.94%.
The diff coverage is 25%.

@@                  Coverage Diff                   @@
##           new-notifications    #3083       +/-   ##
======================================================
- Coverage              29.86%   16.92%   -12.95%     
======================================================
  Files                    184      176        -8     
  Lines                  13754    13701       -53     
  Branches                1839     1836        -3     
======================================================
- Hits                    4108     2319     -1789     
- Misses                  9508    11374     +1866     
+ Partials                 138        8      -130

Impacted Files	Coverage Δ
app/inbox/views.py	0% <0%> (-33.34%)	⬇️
app/inbox/models.py	92.85% <50%> (+0.54%)	⬆️
app/kudos/forms.py	0% <0%> (-100%)	⬇️
app/external_bounties/router.py	0% <0%> (-100%)	⬇️
app/avatar/urls.py	0% <0%> (-100%)	⬇️
app/external_bounties/forms.py	0% <0%> (-100%)	⬇️
app/app/urls.py	0% <0%> (-87.5%)	⬇️
app/dashboard/ios.py	0% <0%> (-77.78%)	⬇️
app/app/middleware.py	0% <0%> (-71.43%)	⬇️
app/app/context.py	0% <0%> (-70.38%)	⬇️
... and 64 more

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[codecov]

Codecov Report

Merging #3083 into new-notifications will decrease coverage by 0.05%.
The diff coverage is 12.5%.

@@                  Coverage Diff                  @@
##           new-notifications    #3083      +/-   ##
=====================================================
- Coverage              29.86%   29.81%   -0.06%     
=====================================================
  Files                    184      184              
  Lines                  13754    13761       +7     
  Branches                1839     1841       +2     
=====================================================
- Hits                    4108     4103       -5     
- Misses                  9508     9520      +12     
  Partials                 138      138

Impacted Files	Coverage Δ
app/inbox/models.py	92.85% <50%> (+0.54%)	⬆️
app/inbox/views.py	25% <7.14%> (-8.34%)	⬇️
app/dashboard/embed.py	28.16% <0%> (-3.45%)	⬇️

---

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Δ = absolute <relative> (impact), ø = not affected, ? = missing data
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