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Introduce the first piece of the DSI-to-OSI conversion pipeline. DSI SemanticModels are converted to OSI Datasets, with dimensions, measures, and entities each becoming OSI Fields. Entities additionally populate the dataset's primary_key and unique_keys. The converter accepts a configurable SQL dialect (defaulting to ANSI_SQL) and operates against the SemanticManifest protocol for flexibility.
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Build an entity index mapping each entity name to the datasets that declare it (PRIMARY, UNIQUE, FOREIGN -- NATURAL excluded for now). Every pair of datasets sharing an entity name becomes an explicit OSI relationship, with from/to columns derived from entity expr or name.
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This is a draft