fix asset_type_v1 null issue

[bowenyang007]

Summary

Not sure why diesel is being weird here and overriding field with null even though treat_none_as_null is false.

Backfill

When first v2 only apt was created.
Testnet: 2598047902
Mainnet: 1669115601

Test

asset_type_v1 was null before

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 50.0%. Comparing base (89e0159) to head (78f6a3f).
Report is 1 commits behind head on main.

Additional details and impacted files

@@          Coverage Diff          @@
##            main    #702   +/-   ##
=====================================
  Coverage   50.0%   50.0%           
=====================================
  Files        251     251           
  Lines      28334   28335    +1     
=====================================
+ Hits       14169   14170    +1     
  Misses     14165   14165           

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[bowenyang007]

Not sure what's happening here. Locally these tests pass. Are the flaky or did something actually change @yuunlimm ?

[rtso]

@bowenyang007 @yuunlimm they're passing bc there aren't any tests that process multiple txn's, but we should add them as fast follow