Hubzilla Documentation:


idsequential IDint(10) unsignedNOPRINULLauto_increment of the referenced itemint(11)NOMULNULL
uidchannel.channel_id of the owner of this dataint(11)NOMULNULL
sidan additional identifier to attach or link to the referenced item (often used to store a message_id from another system in order to suppress duplicates)char(255)NOMULNULL
servicethe name or description of the service which generated this identifierchar(255)NOMULNULL

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