One way to model the data would be to use a composite key that is made
up of the RDMS primary_key + "." + field_name. Then just have a single
column that contains the value of the field.
Individual field lookups will be a simple get and to get all of fields
of a record, you would do a scan with startrow => primary_key + ".!",
endrow => primary_key + ".~"

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