Start storing X posts in separate table

[koutst]

• Extracts X metrics mapping logic into mapper.
• Stops storing posts in external_metadata.
• Adds XPosts table and starts storing posts in there.

[chatgpt-codex-connector]

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[codecov]

Codecov Report

❌ Patch coverage is 92.55319% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 75.66%. Comparing base (d194f9d) to head (edb4a73).

Files with missing lines	Patch %	Lines
src/paper/related_models/x_post_model.py	88.00%	3 Missing ⚠️
src/paper/ingestion/clients/enrichment/x.py	88.23%	2 Missing ⚠️
src/paper/ingestion/mappers/enrichment/x.py	94.11%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2979      +/-   ##
==========================================
+ Coverage   75.64%   75.66%   +0.02%     
==========================================
  Files         533      535       +2     
  Lines       29270    29320      +50     
==========================================
+ Hits        22142    22186      +44     
- Misses       7128     7134       +6     

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[chatgpt-codex-connector]

Codex usage limits have been reached for code reviews. Please check with the admins of this repo to increase the limits by adding credits.
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[sonarqubecloud]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud