"network" => ["type" => "char(4)", "not null" => "1", "default" => "", "comment" => ""],
"created" => ["type" => "datetime", "not null" => "1", "default" => DBA::NULL_DATETIME, "comment" => ""],
"received" => ["type" => "datetime", "not null" => "1", "default" => DBA::NULL_DATETIME, "comment" => ""],
+ "changed" => ["type" => "datetime", "not null" => "1", "default" => DBA::NULL_DATETIME, "comment" => "Date that something in the conversation changed, indicating clients should fetch the conversation again"],
"commented" => ["type" => "datetime", "not null" => "1", "default" => DBA::NULL_DATETIME, "comment" => ""]
],
"indexes" => [