The msg_resource_links table was a table used for tracking which messages are contained in which resources. Message blobs ^[1] were cached in the msg_resource table and automatically invalidated when one of their constituent messages or the resource itself were changed. See Manual:MessageBlobStore.php .

DESCRIBE msg_resource_links;

+--------------+----------------+------+-----+---------+-------+
| Field        | Type           | Null | Key | Default | Extra |
+--------------+----------------+------+-----+---------+-------+
| mrl_resource | varbinary(255) | NO   | PRI | NULL    |       |
| mrl_message  | varbinary(255) | NO   | PRI | NULL    |       |
+--------------+----------------+------+-----+---------+-------+

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