Added four new properties (`FullName`, `Position`, `Place`, and
`Ink`) to the `Signature` class. Each property is annotated with
the `[Column]` attribute to map to corresponding database columns
(`FULL_NAME`, `POSITION`, `PLACE`, and `INK`). The properties
support nullable values based on the `nullable` directive,
ensuring compatibility with nullable reference types. These
changes enhance the `Signature` class by enabling additional
data storage and retrieval.
TekH
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