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Add a Snowflake catalog fixture and type mapping #27

Description

@Victoria824

Why

A credential-free Snowflake example will make the metadata adapter contract easier to understand and test.

Acceptance criteria

  • Add a sanitized Snowflake schema fixture under tests_py/fixtures/
  • Map databases, schemas, tables, columns, comments, and common Snowflake types into Catalog
  • Cover quoted identifiers and one semi-structured VARIANT column
  • Add focused tests without a live account or network dependency
  • Document the fixture and the boundary between introspection and execution

Helpful starting points

  • src/queryassure/metadata.py
  • tests_py/test_metadata.py
  • docs/data-strategy.md

Activity

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