Fix: duplicate entries in /grants/report API

[sebastiantf]

Description

It seems the current output from the /grants/report/ endpoint contains duplicate entries, which is supposedly causing a performance issue at the endpoint, ultimately leading to a 502: #6633 (comment)

https://gitcoin.co/api/v0.1/grants/report/?eth_address=0xC0eBeFadCbF1d2A85fBfDDC226a95860F5152b5f&from_timestamp=2019-05-01T01:24:15Z&to_timestamp=2020-06-09T01:24:15Z

This PR prevents the duplicate entries to appear in the API response.

Refers/Fixes

Refers/Fixes/Follow-up to: #6633
Refers/Fixes/Follow-up to: #6633 (comment)

Testing

Before:

After:

[codecov]

Codecov Report

Merging #6830 into master will increase coverage by 0.02%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #6830      +/-   ##
==========================================
+ Coverage   26.65%   26.67%   +0.02%     
==========================================
  Files         294      294              
  Lines       28134    28135       +1     
  Branches     4139     4139              
==========================================
+ Hits         7498     7504       +6     
+ Misses      20370    20365       -5     
  Partials      266      266              

Impacted Files	Coverage Δ
app/grants/router.py	32.83% <0.00%> (-0.50%)	⬇️
app/dashboard/embed.py	31.60% <0.00%> (+3.44%)	⬆️

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[danlipert]

@thelostone-mc @sebastiantf I couldn't get this to work locally using the example you provided with a copy of the prod grants data in my local

[sebastiantf]

@danlipert The example uses an eth_address that's not available in the prod grants data. Try using 0x240dA283477044D2cA519C8e068BC489E20b573d or any other admin_address with amount_received > 0 from https://gitcoin.co/api/v0.1/grants/

Or maybe the API isn't deployed yet?

[danlipert]

ah nvm i got it working 👍