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docs(transformations): add external data sources guide - #2734

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docs(transformations): add external data sources guide#2734
Khyat-Cognite wants to merge 1 commit into
feat/transformations-externaldata-apifrom
feat/transformations-externaldata-docs

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@Khyat-Cognite Khyat-Cognite commented Jul 31, 2026

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Third and last PR in the stack: #2729 (data classes) → #2732 (client API) → this one. Review #2732 first; this diff is docs only.

Adds docs/source/transformations_external_data_sources.rst, reached from a nested toctree on the Transformations page — the feature is one sub-API of transformations, not a family of its own, so it belongs under that page rather than as a peer entry in index.rst.

Contents

Concepts (format, credentials, location, data set scoping), a per-operation permission table, then task-oriented sections: register a data source, verify it is usable, read its tables from transformation SQL, list data sources, rotate the client secret, delete a data source.

Walks through registering a Fabric OneLake data source, checking that it
is usable, reading its tables from transformation SQL with
ext_onelake(), rotating the client secret and deleting the data source.

The page is reached from the Transformations page and cross-references
the API and data class reference there instead of repeating the
autosummary and automodule directives.
@Khyat-Cognite Khyat-Cognite self-assigned this Jul 31, 2026
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