The thread table is replaced by post-thread and post-thread-user

src/Model/Item.php

@@ -979,6 +979,10 @@ class Item
 			Post\Media::insertFromAttachment($item['uri-id'], $item['attach']);
 		}
 
+		if ($item['gravity'] == GRAVITY_PARENT) {
+			Post\Thread::insert($item['uri-id'], $item);
+		}
+
 		if (!in_array($item['verb'], self::ACTIVITIES)) {
 			Post\Content::insert($item['uri-id'], $item);
 		}
@@ -2203,9 +2207,9 @@ class Item
 
 	public static function firstPostDate($uid, $wall = false)
 	{
-		$condition = ['uid' => $uid, 'wall' => $wall, 'deleted' => false, 'visible' => true, 'moderated' => false];
+		$condition = ['gravity' => GRAVITY_PARENT, 'uid' => $uid, 'wall' => $wall, 'deleted' => false, 'visible' => true, 'moderated' => false];
 		$params = ['order' => ['received' => false]];
-		$thread = DBA::selectFirst('thread', ['received'], $condition, $params);
+		$thread = Post::selectFirst(['received'], $condition, $params);
 		if (DBA::isResult($thread)) {
 			return substr(DateTimeFormat::local($thread['received']), 0, 10);
 		}

src/Model/Post.php

@@ -194,7 +194,7 @@ class Post
 				'parent-guid', 'parent-network', 'parent-author-id', 'parent-author-link', 'parent-author-name',
 				'parent-author-network', 'signed_text', 'language', 'raw-body'], Item::DISPLAY_FIELDLIST, Item::ITEM_FIELDLIST);
 			
-			if ($view == 'post-thread-view') {
+			if ($view != 'post-view') {
 				$selected = array_merge($selected, ['ignored', 'iid']);
 			}
 		}
@@ -448,6 +448,18 @@ class Post
 			$affected = max($affected, DBA::affectedRows());
 		}
 
+		$update_fields = DBStructure::getFieldsForTable('post-thread', $fields);
+		if (!empty($update_fields)) {
+			$rows = DBA::selectToArray('post-view', ['uri-id'], $condition, ['group_by' => ['uri-id']]);
+			$uriids = array_column($rows, 'uri-id');
+			if (!DBA::update('post-thread', $update_fields, ['uri-id' => $uriids])) {
+				DBA::rollback();
+				Logger::notice('Updating post-thread failed', ['fields' => $update_fields, 'condition' => $condition]);
+				return false;
+			}
+			$affected = max($affected, DBA::affectedRows());
+		}
+
 		$update_fields = DBStructure::getFieldsForTable('post-thread-user', $fields);
 		if (!empty($update_fields)) {
 			$rows = DBA::selectToArray('post-view', ['post-user-id'], $thread_condition);

src/Model/Post/Thread.php

@@ -0,0 +1,97 @@
+<?php
+/**
+ * @copyright Copyright (C) 2020, Friendica
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ */
+
+namespace Friendica\Model\Post;
+
+use \BadMethodCallException;
+use Friendica\Core\Protocol;
+use Friendica\Database\Database;
+use Friendica\Database\DBA;
+use Friendica\Database\DBStructure;
+use Friendica\Model\Post;
+
+class Thread
+{
+	/**
+	 * Insert a new post-thread entry
+	 *
+	 * @param integer $uri_id
+	 * @param array   $fields
+	 * @return bool   success
+	 * @throws \Exception
+	 */
+	public static function insert(int $uri_id, array $data = [])
+	{
+		if (empty($uri_id)) {
+			throw new BadMethodCallException('Empty URI_id');
+		}
+
+		$fields = DBStructure::getFieldsForTable('post-thread', $data);
+
+		// Additionally assign the key fields
+		$fields['uri-id'] = $uri_id;
+
+		return DBA::insert('post-thread', $fields, Database::INSERT_IGNORE);
+	}
+
+	/**
+	 * Update a post-thread entry
+	 *
+	 * @param integer $uri_id
+	 * @param array   $data
+	 * @param bool    $insert_if_missing
+	 * @return bool
+	 * @throws \Exception
+	 */
+	public static function update(int $uri_id, array $data = [], bool $insert_if_missing = false)
+	{
+		if (empty($uri_id)) {
+			throw new BadMethodCallException('Empty URI_id');
+		}
+
+		$fields = DBStructure::getFieldsForTable('post-thread', $data);
+
+		// Remove the key fields
+		unset($fields['uri-id']);
+
+		if (empty($fields)) {
+			return true;
+		}
+
+		return DBA::update('post-thread', $fields, ['uri-id' => $uri_id], $insert_if_missing ? true : []);
+	}
+
+	/**
+	 * Delete a row from the post-thread table
+	 *
+	 * @param array        $conditions Field condition(s)
+	 * @param array        $options
+	 *                           - cascade: If true we delete records in other tables that depend on the one we're deleting through
+	 *                           relations (default: true)
+	 *
+	 * @return boolean was the delete successful?
+	 * @throws \Exception
+	 */
+	public static function delete(array $conditions, array $options = [])
+	{
+		return DBA::delete('post-thread', $conditions, $options);
+	}
+}