You're seeing just the function column_data_type, go back to EventStore.Config module for more information.
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column_data_type(event_store, config)

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Get the data type used to store event data and metadata.

Supported data types are:

  • "bytea" - Allows storage of binary strings.
  • "jsonb" - Native JSON type, data is stored in a decomposed binary format that makes it slightly slower to input due to added conversion overhead, but significantly faster to process, since no reparsing is needed.