Change SQL update query (#6957)

* Change SQL update query for MariaDB / MySQL
fix https://github.com/FreshRSS/FreshRSS/issues/5707

* No change for SQLite

* Fix merge error

* Update MySQL version on the model of PostgreSQL
Performance to be tested

* Fix LEFT JOIN, also for PostgreSQL / SQLite

* Fix alias

* Reduce MySQL deadlock

* Fix compatibility with SQLite

* Back to identical SQL for all databases

3 files changed, 35 insertions, 44 deletions

diff --git a/app/Models/EntryDAO.php b/app/Models/EntryDAO.php
index 572c9054d..b4f7451c7 100644
--- a/app/Models/EntryDAO.php
+++ b/app/Models/EntryDAO.php
@@ -1679,7 +1679,13 @@ SQL;
 			}
 			return $affected;
 		}
-		$sql = 'UPDATE `_entry` SET `lastSeen`=? WHERE id_feed=? AND guid IN (' . str_repeat('?,', count($guids) - 1) . '?)';
+
+		// Reduce MySQL deadlock probability by ensuring consistent lock ordering
+		$orderBy = $this->pdo->dbType() === 'mysql' ? ' ORDER BY id DESC' : '';
+
+		$sql = 'UPDATE `_entry` ' .
+			'SET `lastSeen`=? WHERE id_feed=? AND guid IN (' . str_repeat('?,', count($guids) - 1) . '?)' .
+			$orderBy;
 		$stm = $this->pdo->prepare($sql);
 		if ($mtime <= 0) {
 			$mtime = time();
diff --git a/app/Models/FeedDAO.php b/app/Models/FeedDAO.php
index 0353f9a05..ddc2057db 100644
--- a/app/Models/FeedDAO.php
+++ b/app/Models/FeedDAO.php
@@ -479,17 +479,38 @@ SQL;
 	 * Update cached values for selected feeds, or all feeds if no feed ID is provided.
 	 */
 	public function updateCachedValues(int ...$feedIds): int|false {
-		//2 sub-requests with FOREIGN KEY(e.id_feed), INDEX(e.is_read) faster than 1 request with GROUP BY or CASE
+		if (empty($feedIds)) {
+			$whereFeedIds = 'true';
+			$whereEntryIdFeeds = 'true';
+		} else {
+			$whereFeedIds = 'id IN (' . str_repeat('?,', count($feedIds) - 1) . '?)';
+			$whereEntryIdFeeds = 'id_feed IN (' . str_repeat('?,', count($feedIds) - 1) . '?)';
+		}
 		$sql = <<<SQL
+			WITH entry_counts AS (
+				SELECT
+					id_feed,
+					COUNT(*) AS total_entries,
+					SUM(CASE WHEN is_read = 0 THEN 1 ELSE 0 END) AS unread_entries
+				FROM `_entry`
+				WHERE $whereEntryIdFeeds
+				GROUP BY id_feed
+			)
 			UPDATE `_feed`
-			SET `cache_nbEntries`=(SELECT COUNT(e1.id) FROM `_entry` e1 WHERE e1.id_feed=`_feed`.id),
-				`cache_nbUnreads`=(SELECT COUNT(e2.id) FROM `_entry` e2 WHERE e2.id_feed=`_feed`.id AND e2.is_read=0)
+			SET `cache_nbEntries` = COALESCE((
+					SELECT c.total_entries
+					FROM entry_counts AS c
+					WHERE c.id_feed = `_feed`.id
+				), 0),
+				`cache_nbUnreads` = COALESCE((
+					SELECT c.unread_entries
+					FROM entry_counts AS c
+					WHERE c.id_feed = `_feed`.id
+				), 0)
+			WHERE $whereFeedIds
 			SQL;
-		if (count($feedIds) > 0) {
-			$sql .= ' WHERE id IN (' . str_repeat('?,', count($feedIds) - 1) . '?)';
-		}
 		$stm = $this->pdo->prepare($sql);
-		if ($stm !== false && $stm->execute($feedIds)) {
+		if ($stm !== false && $stm->execute(array_merge($feedIds, $feedIds))) {
 			return $stm->rowCount();
 		} else {
 			$info = $stm === false ? $this->pdo->errorInfo() : $stm->errorInfo();
diff --git a/app/Models/FeedDAOPGSQL.php b/app/Models/FeedDAOPGSQL.php
index 954a6e0ff..f436a2ec4 100644
--- a/app/Models/FeedDAOPGSQL.php
+++ b/app/Models/FeedDAOPGSQL.php
@@ -10,40 +10,4 @@ SELECT setval('`_feed_id_seq`', COALESCE(MAX(id), 0) + 1, false) FROM `_feed`
 SQL;
 		return $this->pdo->exec($sql) !== false;
 	}
-
-	#[\Override]
-	public function updateCachedValues(int ...$feedIds): int|false {
-		// Faster than the MySQL version
-		if (empty($feedIds)) {
-			$whereFeedIds = 'true';
-			$whereEntryIdFeeds = 'true';
-		} else {
-			$whereFeedIds = 'id IN (' . str_repeat('?,', count($feedIds) - 1) . '?)';
-			$whereEntryIdFeeds = 'id_feed IN (' . str_repeat('?,', count($feedIds) - 1) . '?)';
-		}
-		$sql = <<<SQL
-			WITH entry_counts AS (
-				SELECT
-					id_feed,
-					COUNT(*) AS total_entries,
-					SUM(CASE WHEN is_read = 0 THEN 1 ELSE 0 END) AS unread_entries
-				FROM `_entry`
-				WHERE $whereEntryIdFeeds
-				GROUP BY id_feed
-			)
-			UPDATE `_feed`
-			SET `cache_nbEntries` = COALESCE(c.total_entries, 0),
-				`cache_nbUnreads` = COALESCE(c.unread_entries, 0)
-			FROM entry_counts c
-			WHERE id = c.id_feed AND $whereFeedIds
-			SQL;
-		$stm = $this->pdo->prepare($sql);
-		if ($stm !== false && $stm->execute(array_merge($feedIds, $feedIds))) {
-			return $stm->rowCount();
-		} else {
-			$info = $stm === false ? $this->pdo->errorInfo() : $stm->errorInfo();
-			Minz_Log::error('SQL error ' . __METHOD__ . json_encode($info));
-			return false;
-		}
-	}
 }