fix(dataset): Add versions to dataset metadata

[nina-kollman]

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Important

Add versioning to dataset metadata and update example script to demonstrate version retrieval.

• Behavior:
  • Adds versions field to DatasetMetadata in model.py to store dataset version history.
  • Updates dataset_example.py to print dataset versions using client.datasets.get_all().
• Models:
  • Introduces DatasetVersion class in model.py with fields version, published_by, and published_at.
• Misc:
  • Changes Traceloop.init() call in dataset_example.py to use endpoint_is_traceloop=True.

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Summary by CodeRabbit

• New Features

  • Datasets now include version tracking with publisher and publication timestamp.
  • Dataset name is optional and dataset entries can include a list of versions.

• Chores

  • Minor non-functional comment added to the sample app; no runtime or behavioral changes.

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📝 Walkthrough

Walkthrough

Added a new DatasetVersion model with publication metadata, made DatasetMetadata.name optional, and added an optional versions list to DatasetMetadata; a sample app file received a single commented line addition only.

Changes

Cohort / File(s)	Summary
Dataset model updates packages/traceloop-sdk/traceloop/sdk/datasets/model.py	Added DatasetVersion model (version: str, published_by: Optional[str] = None, published_at: datetime). Changed DatasetMetadata.name from str to Optional[str] = None. Added optional versions: Optional[List[DatasetVersion]] = None.
Sample app comment change packages/sample-app/sample_app/dataset_example.py	Added a non-executable commented line (# main()) after the existing if __name__ == "__main__": main() call; no runtime behavior change.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

Poem

🐇 I nibble at schemas, fresh and bright,

A version here, a name made light.
A tiny comment left to play—
New metadata hops out to day.

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main change: adding a versions field to dataset metadata, which is the primary modification in the changeset.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

• 📝 Generate docstrings (stacked PR)
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🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch nk/add_dataset_version

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[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against the current code and only fix it if needed.

Inline comments:
In `@packages/sample-app/sample_app/dataset_example.py`:
- Around line 510-512: Remove the commented-out dead code by deleting the stray
"# main()" in the if __name__ == "__main__": block and ensure the script either
implements the promised behavior (use client.datasets.get_all() to print dataset
versions—update the main() function to call client.datasets.get_all() and print
each dataset/version) or update the PR description to remove that claim; modify
the main() function (and any dataset-related helper functions) to perform the
dataset-version printing if you choose to add the feature, otherwise just remove
the commented line and correct the PR text.

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📥 Commits

Reviewing files that changed from the base of the PR and between e6b94ca and 3cad1f1.

📒 Files selected for processing (2)

• packages/sample-app/sample_app/dataset_example.py
• packages/traceloop-sdk/traceloop/sdk/datasets/model.py