Use load_in_query: false to prevent automatic loading of large fields

field :very_large_map, :map, load_in_query: false

Key benefits:

• Field defaults to nil unless explicitly selected in query
• Works with any field type (:map, {:array, :string}, :string, etc.)
• Improves performance for list operations that don't need large payloads

Load the field when needed:

select(query, [schema], %{schema | very_large_map: schema.very_large_map})

When to use:

• Fields storing large data (jsonb up to 268MB, json up to 1GB)
• List queries where the field is rarely accessed
• Compatible with both Repo.one/1 and Repo.all/1