Mint: storage of Y in mint db

[callebtc]

No description provided.

[codecov]

Codecov Report

Attention: 28 lines in your changes are missing coverage. Please review.

Comparison is base (1de7abf) 62.19% compared to head (940fd39) 68.39%.

Files	Patch %	Lines
cashu/core/crypto/b_dhke.py	31.03%	20 Missing ⚠️
cashu/mint/ledger.py	72.72%	3 Missing ⚠️
cashu/mint/migrations.py	92.30%	2 Missing ⚠️
cashu/wallet/wallet.py	66.66%	2 Missing ⚠️
cashu/mint/verification.py	90.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #412      +/-   ##
==========================================
+ Coverage   62.19%   68.39%   +6.20%     
==========================================
  Files          73       73              
  Lines        6340     6401      +61     
==========================================
+ Hits         3943     4378     +435     
+ Misses       2397     2023     -374     

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