IM chat how to store offline messages if the other party is not online

IM chat
how to store offline messages if the other person is not online

Instant-messaging im
Mar.04,2021

throw it directly into the library, type a tag (bound with a member) to the chat room to identify the timestamp of its last read, or message id (if message id can be sorted)

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MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b35c08-2b507.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b35c08-2b507.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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