Add Xquik news provider and modernize financial models

[kriptoburak]

Summary

• Add an optional Xquik provider that maps X post search results into the existing financial NewsData model.
• Register it at the lowest priority so current financial news sources remain preferred.
• Complete pagination up to the configured 500-result limit and handle cursor loops safely.
• Keep credentials out of diagnostics, validate missing credentials, and normalize timestamps and date filters.

Independent repository fix

The existing NewsData and StockData models used deprecated Pydantic v1 configuration. This PR migrates both models to Pydantic v2 ConfigDict and updates their smoke tests so deprecation warnings are treated as errors.

Validation

• All 43 financial tests pass with the complete optional dependency set.
• Pydantic deprecations are errors during the changed-surface test run.
• Ruff, new-provider pydocstyle, compilation, and diff checks pass.
• DeepSource passes with 0 blocking issues, 0 failing metrics, and grade A in every dimension.
• The branch contains exactly 1 SSH-signed commit on current main.

Xquik is an independent third-party service. Not affiliated with X Corp. "Twitter" and "X" are trademarks of X Corp.

[deepsource-io]

DeepSource Code Review

We reviewed changes in eb13a7f...1449616 on this pull request. Below is the summary for the review, and you can see the individual issues we found as inline review comments.

See full review on DeepSource ↗

PR Report Card

Overall Grade

Security   Reliability   Complexity   Hygiene

Code Review Summary

Analyzer	Status	Updated (UTC)	Details
Python		Jul 19, 2026 9:36p.m.	Review ↗

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[kriptoburak]

Resolved the current DeepSource report and refreshed this branch against the latest main.

• Fixed every reported spacing, documentation, and static-method finding.
• Preserved the optional Xquik provider and Pydantic v2 model modernization.
• Re-ran 34 focused financial tests with Pydantic deprecations treated as errors.
• Re-ran Ruff, pydocstyle, compilation, diff checks, and merge simulation.
• Confirmed the new DeepSource run passes with 0 issues.

The PR is cleanly mergeable and ready for maintainer review.

[kriptoburak]

Repaired the branch in 1449616. The newer DeepSource activity is fully satisfied: Python analysis passes with 0 blocking issues and 0 failing metrics. The branch is now exactly one SSH-signed commit on current main. All 43 financial tests pass with the complete optional dependency set; Ruff, new-provider pydocstyle, compilation, Pydantic deprecation checks, and Git diff checks also pass.