diff --git a/database.sql b/database.sql
index 12d0322541..f298a8e8e3 100644
--- a/database.sql
+++ b/database.sql
@@ -1,6 +1,6 @@
 -- ------------------------------------------
 -- Friendica 2021.03-dev (Red Hot Poker)
--- DB_UPDATE_VERSION 1406
+-- DB_UPDATE_VERSION 1407
 -- ------------------------------------------
 
 
@@ -929,7 +929,7 @@ CREATE TABLE IF NOT EXISTS `post` (
 	`network` char(4) NOT NULL DEFAULT '' COMMENT 'Network from where the item comes from',
 	`owner-id` int unsigned NOT NULL DEFAULT 0 COMMENT 'Link to the contact table with uid=0 of the owner of this item',
 	`author-id` int unsigned NOT NULL DEFAULT 0 COMMENT 'Link to the contact table with uid=0 of the author of this item',
-	`causer-id` int unsigned NOT NULL DEFAULT 0 COMMENT 'Link to the contact table with uid=0 of the contact that caused the item creation',
+	`causer-id` int unsigned COMMENT 'Link to the contact table with uid=0 of the contact that caused the item creation',
 	`post-type` tinyint unsigned NOT NULL DEFAULT 0 COMMENT 'Post type (personal note, bookmark, ...)',
 	`vid` smallint unsigned COMMENT 'Id of the verb table entry that contains the activity verbs',
 	`private` tinyint unsigned NOT NULL DEFAULT 0 COMMENT '0=public, 1=private, 2=unlisted',
@@ -1061,7 +1061,7 @@ CREATE TABLE IF NOT EXISTS `post-thread` (
 	`uri-id` int unsigned NOT NULL COMMENT 'Id of the item-uri table entry that contains the item uri',
 	`owner-id` int unsigned NOT NULL DEFAULT 0 COMMENT 'Item owner',
 	`author-id` int unsigned NOT NULL DEFAULT 0 COMMENT 'Item author',
-	`causer-id` int unsigned NOT NULL DEFAULT 0 COMMENT 'Link to the contact table with uid=0 of the contact that caused the item creation',
+	`causer-id` int unsigned COMMENT 'Link to the contact table with uid=0 of the contact that caused the item creation',
 	`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 '',
@@ -1096,7 +1096,7 @@ CREATE TABLE IF NOT EXISTS `post-user` (
 	`network` char(4) NOT NULL DEFAULT '' COMMENT 'Network from where the item comes from',
 	`owner-id` int unsigned NOT NULL DEFAULT 0 COMMENT 'Link to the contact table with uid=0 of the owner of this item',
 	`author-id` int unsigned NOT NULL DEFAULT 0 COMMENT 'Link to the contact table with uid=0 of the author of this item',
-	`causer-id` int unsigned NOT NULL DEFAULT 0 COMMENT 'Link to the contact table with uid=0 of the contact that caused the item creation',
+	`causer-id` int unsigned COMMENT 'Link to the contact table with uid=0 of the contact that caused the item creation',
 	`post-type` tinyint unsigned NOT NULL DEFAULT 0 COMMENT 'Post type (personal note, bookmark, ...)',
 	`vid` smallint unsigned COMMENT 'Id of the verb table entry that contains the activity verbs',
 	`private` tinyint unsigned NOT NULL DEFAULT 0 COMMENT '0=public, 1=private, 2=unlisted',
@@ -1155,7 +1155,7 @@ CREATE TABLE IF NOT EXISTS `post-thread-user` (
 	`uri-id` int unsigned NOT NULL COMMENT 'Id of the item-uri table entry that contains the item uri',
 	`owner-id` int unsigned NOT NULL DEFAULT 0 COMMENT 'Item owner',
 	`author-id` int unsigned NOT NULL DEFAULT 0 COMMENT 'Item author',
-	`causer-id` int unsigned NOT NULL DEFAULT 0 COMMENT 'Link to the contact table with uid=0 of the contact that caused the item creation',
+	`causer-id` int unsigned COMMENT 'Link to the contact table with uid=0 of the contact that caused the item creation',
 	`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 '',