feat(wallet): Add ability to track wallet transaction history

[edgarmuyomba]

Closes #173

Supersedes #315

Summary

This PR introduces functionality to the wallet to be able to keep track of past transactions. It adds code that hooks into transaction facing functions of the wallet to store transaction details in the transactions database table that can be queried later to examine the history.

Changes

• Adds migration m017 to create the transactions table
• Adds crud functionality for the transactions table: store_transactions(...), update_transaction_state(...) and get_transaction_state(...) -> cashu/wallet/crud.py
• Modifies the send, receive, mint and melt methods in the cashu/wallet/helpers.py and cashu/wallet/wallet.py files to store and update transactions when they take place
• Adds the history command to the wallet cli in cashu/wallet/cli/cli.py.
• Adds tests in the tests/wallet/test_wallet_cli.py and tests/wallet/test_wallet_crud_unit.py covering storing, update and querying of the transactions table

Transactions Table Structure

Field	Data-Type	Notes
id	INTEGER	PRIMARY KEY
type	TEXT	'mint' / 'melt' / 'send' / 'receive'
amount	INTEGER
unit	TEXT	e.g. 'sat'
mint	TEXT	mint URL
state	TEXT	'pending' / 'completed' / 'failed'
quote_id	TEXT	bolt11 quote id for mint/melt; NULL for ecash
fee	INTEGER	melt only: actual fee paid
preimage	TEXT	melt only: payment preimage
created_time	INTEGER	unix timestamp

Example Ouput

After running command cashu history

-------------- Transaction history --------------
Type                Amount  State       Time
-------------------------------------------------
mint           +100000 sat  completed   2026-06-09 05:28
melt                -1 sat  completed   2026-06-09 05:23
mint              +100 sat  completed   2026-06-09 03:19
send              -300 sat  completed   2026-06-09 03:18

[codecov]

Codecov Report

❌ Patch coverage is 95.19231% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 75.26%. Comparing base (654de18) to head (63c4c6f).
⚠️ Report is 11 commits behind head on main.

Files with missing lines	Patch %	Lines
cashu/wallet/cli/cli.py	93.33%	2 Missing ⚠️
cashu/wallet/helpers.py	80.00%	1 Missing ⚠️
cashu/wallet/wallet.py	90.90%	1 Missing ⚠️
cashu/wallet/wallet_transaction.py	96.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1041      +/-   ##
==========================================
+ Coverage   75.09%   75.26%   +0.17%     
==========================================
  Files         110      111       +1     
  Lines       12093    12193     +100     
==========================================
+ Hits         9081     9177      +96     
- Misses       3012     3016       +4     

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