diff --git a/database.sql b/database.sql
index 0067cc8e8d..1b4ef429b9 100644
--- a/database.sql
+++ b/database.sql
@@ -1056,6 +1056,7 @@ CREATE TABLE IF NOT EXISTS `post-thread` (
 	`network` char(4) NOT NULL DEFAULT '' COMMENT '',
 	`created` datetime NOT NULL DEFAULT '0001-01-01 00:00:00' COMMENT '',
 	`received` datetime NOT NULL DEFAULT '0001-01-01 00:00:00' COMMENT '',
+	`changed` datetime NOT NULL DEFAULT '0001-01-01 00:00:00' COMMENT 'Date that something in the conversation changed, indicating clients should fetch the conversation again',
 	`commented` datetime NOT NULL DEFAULT '0001-01-01 00:00:00' COMMENT '',
 	 PRIMARY KEY(`uri-id`),
 	 INDEX `owner-id` (`owner-id`),
diff --git a/static/dbstructure.config.php b/static/dbstructure.config.php
index ebb55b5d57..dad85d7b31 100644
--- a/static/dbstructure.config.php
+++ b/static/dbstructure.config.php
@@ -1109,6 +1109,7 @@ return [
 			"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" => [