feat: history overwrite

[dartpain]

• What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)

• Why was this change needed? (You can also link to an open issue here)

• Other information:

[vercel]

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Project	Deployment	Actions	Updated (UTC)
nextra-docsgpt	Building	Preview, Comment	Apr 6, 2026 1:58pm
oss-docsgpt	Ready	Preview, Comment	Apr 6, 2026 1:58pm

[codecov]

Codecov Report

❌ Patch coverage is 88.88889% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 96.61%. Comparing base (6381f7d) to head (689dd79).
⚠️ Report is 29 commits behind head on main.

Files with missing lines	Patch %	Lines
...pplication/api/answer/services/stream_processor.py	91.66%	4 Missing ⚠️
application/api/user/agents/routes.py	60.00%	2 Missing ⚠️
application/api/v1/routes.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2362      +/-   ##
==========================================
- Coverage   96.71%   96.61%   -0.10%     
==========================================
  Files         191      191              
  Lines       16737    16861     +124     
==========================================
+ Hits        16187    16291     +104     
- Misses        550      570      +20     

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