diff --git a/database.sql b/database.sql
index 4956798ba2..d7772920d8 100644
--- a/database.sql
+++ b/database.sql
@@ -1,5 +1,5 @@
 -- ------------------------------------------
--- Friendica 2020.03-rc (Dalmatian Bellflower)
+-- Friendica 2020.06-dev (Red Hot Poker)
 -- DB_UPDATE_VERSION 1338
 -- ------------------------------------------
 
@@ -1152,19 +1152,6 @@ CREATE TABLE IF NOT EXISTS `session` (
 	 INDEX `expire` (`expire`)
 ) DEFAULT COLLATE utf8mb4_general_ci COMMENT='web session storage';
 
---
--- TABLE sign
---
-CREATE TABLE IF NOT EXISTS `sign` (
-	`id` int unsigned NOT NULL auto_increment COMMENT 'sequential ID',
-	`iid` int unsigned NOT NULL DEFAULT 0 COMMENT 'item.id',
-	`signed_text` mediumtext COMMENT '',
-	`signature` text COMMENT '',
-	`signer` varchar(255) NOT NULL DEFAULT '' COMMENT '',
-	 PRIMARY KEY(`id`),
-	 UNIQUE INDEX `iid` (`iid`)
-) DEFAULT COLLATE utf8mb4_general_ci COMMENT='Diaspora signatures';
-
 --
 -- TABLE term
 --
diff --git a/src/Model/Item.php b/src/Model/Item.php
index a9a6eede23..d24340d764 100644
--- a/src/Model/Item.php
+++ b/src/Model/Item.php
@@ -342,10 +342,6 @@ class Item
 			}
 		}
 
-		if (array_key_exists('signed_text', $row) && array_key_exists('interaction', $row) && !is_null($row['interaction'])) {
-			$row['signed_text'] = $row['interaction'];
-		}
-
 		if (array_key_exists('ignored', $row) && array_key_exists('internal-user-ignored', $row) && !is_null($row['internal-user-ignored'])) {
 			$row['ignored'] = $row['internal-user-ignored'];
 		}
@@ -672,7 +668,8 @@ class Item
 	{
 		$fields = [];
 
-		$fields['item'] = ['id', 'uid', 'parent', 'uri', 'parent-uri', 'thr-parent', 'guid',
+		$fields['item'] = ['id', 'uid', 'parent', 'uri', 'parent-uri', 'thr-parent',
+			'guid', 'uri-id', 'parent-uri-id', 'thr-parent-id',
 			'contact-id', 'owner-id', 'author-id', 'type', 'wall', 'gravity', 'extid',
 			'created', 'edited', 'commented', 'received', 'changed', 'psid',
 			'resource-id', 'event-id', 'tag', 'attach', 'post-type', 'file',
@@ -714,9 +711,7 @@ class Item
 			'nofinish' => 'event-nofinish','adjust' => 'event-adjust',
 			'ignore' => 'event-ignore', 'id' => 'event-id'];
 
-		$fields['sign'] = ['signed_text', 'signature', 'signer'];
-
-		$fields['diaspora-interaction'] = ['interaction'];
+		$fields['diaspora-interaction'] = ['interaction', 'interaction' => 'signed_text'];
 
 		return $fields;
 	}
@@ -801,10 +796,6 @@ class Item
 			$joins .= " LEFT JOIN `event` ON `event-id` = `event`.`id`";
 		}
 
-		if (strpos($sql_commands, "`sign`.") !== false) {
-			$joins .= " LEFT JOIN `sign` ON `sign`.`iid` = `item`.`id`";
-		}
-
 		if (strpos($sql_commands, "`diaspora-interaction`.") !== false) {
 			$joins .= " LEFT JOIN `diaspora-interaction` ON `diaspora-interaction`.`uri-id` = `item`.`uri-id`";
 		}
@@ -858,10 +849,6 @@ class Item
 			$selected[] = 'internal-user-ignored';
 		}
 
-		if (in_array('signed_text', $selected)) {
-			$selected[] = 'interaction';
-		}
-
 		$legacy_fields = array_merge(ItemDeliveryData::LEGACY_FIELD_LIST, self::MIXED_CONTENT_FIELDLIST);
 
 		$selection = [];
@@ -2000,10 +1987,6 @@ class Item
 
 			if (!empty($dsprsig->signed_text) && empty($dsprsig->signature) && empty($dsprsig->signer)) {
 				DBA::insert('diaspora-interaction', ['uri-id' => $item['uri-id'], 'interaction' => $dsprsig->signed_text], true);
-			} else {
-				// The other fields are used by very old Friendica servers, so we currently store them differently
-				DBA::insert('sign', ['iid' => $current_post, 'signed_text' => $dsprsig->signed_text,
-					'signature' => $dsprsig->signature, 'signer' => $dsprsig->signer]);
 			}
 		}
 
diff --git a/src/Worker/DBClean.php b/src/Worker/DBClean.php
index 0316b9ebf6..e0cdd70347 100644
--- a/src/Worker/DBClean.php
+++ b/src/Worker/DBClean.php
@@ -71,7 +71,7 @@ class DBClean {
 	 *  3:    Orphaned data from thread table.
 	 *  4:    Orphaned data from notify table.
 	 *  5:    Orphaned data from notify-threads table.
-	 *  6:    Orphaned data from sign table.
+	 *  6:    Legacy functionality (removed)
 	 *  7:    Orphaned data from term table.
 	 *  8:    Expired threads.
 	 *  9:    Old global item entries from expired threads.
@@ -224,31 +224,8 @@ class DBClean {
 				DI::config()->set('system', 'finished-dbclean-5', true);
 			}
 		} elseif ($stage == 6) {
-			$last_id = DI::config()->get('system', 'dbclean-last-id-6', 0);
-
-			Logger::log("Deleting orphaned data from sign table. Last ID: ".$last_id);
-			$r = DBA::p("SELECT `iid`, `id` FROM `sign`
-					WHERE NOT EXISTS (SELECT `id` FROM `item` WHERE `item`.`id` = `sign`.`iid`) AND `id` >= ?
-					ORDER BY `id` LIMIT ?", $last_id, $limit);
-			$count = DBA::numRows($r);
-			if ($count > 0) {
-				Logger::log("found sign orphans: ".$count);
-				while ($orphan = DBA::fetch($r)) {
-					$last_id = $orphan["id"];
-					DBA::delete('sign', ['iid' => $orphan["iid"]]);
-				}
-				Worker::add(PRIORITY_MEDIUM, 'DBClean', 6, $last_id);
-			} else {
-				Logger::log("No sign orphans found");
-			}
-			DBA::close($r);
-			Logger::log("Done deleting ".$count." orphaned data from sign table. Last ID: ".$last_id);
-
-			DI::config()->set('system', 'dbclean-last-id-6', $last_id);
-
-			if ($count < $limit) {
-				DI::config()->set('system', 'finished-dbclean-6', true);
-			}
+			// The legacy functionality had been removed
+			DI::config()->set('system', 'finished-dbclean-6', true);
 		} elseif ($stage == 7) {
 			$last_id = DI::config()->get('system', 'dbclean-last-id-7', 0);
 
diff --git a/static/dbstructure.config.php b/static/dbstructure.config.php
index 707e39468e..94d5a36025 100755
--- a/static/dbstructure.config.php
+++ b/static/dbstructure.config.php
@@ -1268,20 +1268,6 @@ return [
 			"expire" => ["expire"],
 		]
 	],
-	"sign" => [
-		"comment" => "Diaspora signatures",
-		"fields" => [
-			"id" => ["type" => "int unsigned", "not null" => "1", "extra" => "auto_increment", "primary" => "1", "comment" => "sequential ID"],
-			"iid" => ["type" => "int unsigned", "not null" => "1", "default" => "0", "relation" => ["item" => "id"], "comment" => "item.id"],
-			"signed_text" => ["type" => "mediumtext", "comment" => ""],
-			"signature" => ["type" => "text", "comment" => ""],
-			"signer" => ["type" => "varchar(255)", "not null" => "1", "default" => "", "comment" => ""],
-		],
-		"indexes" => [
-			"PRIMARY" => ["id"],
-			"iid" => ["UNIQUE", "iid"],
-		]
-	],
 	"term" => [
 		"comment" => "item taxonomy (categories, tags, etc.) table",
 		"fields" => [