fix purge Redis and load feedback from MongoDB

[zhenghaoz]

No description provided.

[codecov]

Codecov Report

Base: 71.11% // Head: 71.12% // Increases project coverage by +0.00% 🎉

Coverage data is based on head (aa5c34d) compared to base (8007e0d).
Patch coverage: 50.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #571   +/-   ##
=======================================
  Coverage   71.11%   71.12%           
=======================================
  Files          62       62           
  Lines       11904    11933   +29     
=======================================
+ Hits         8466     8487   +21     
- Misses       2616     2626   +10     
+ Partials      822      820    -2     

Impacted Files	Coverage Δ
storage/cache/redis.go	76.33% <20.00%> (-0.09%)	⬇️
storage/data/mongodb.go	79.96% <100.00%> (+0.46%)	⬆️
base/floats/floats_amd64.go	59.64% <0.00%> (-24.57%)	⬇️
server/rest.go	74.34% <0.00%> (+0.19%)	⬆️
storage/data/sql.go	79.16% <0.00%> (+0.27%)	⬆️
storage/data/redis.go	71.25% <0.00%> (+0.47%)	⬆️
master/rest.go	54.98% <0.00%> (+1.01%)	⬆️

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