| Represents a file attachment. Files will be stored on the local
file system, not within the database.
When an Attachment is first uploaded and stored, it is prefixed
with the value of the id generated on the database insert.
This filePrefix property is stored separately to smoothly
handle database migrations. So even if a database export-import
changes the id column values, the files within the attachments
folder can be used as is, without resorting to mass renaming.
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