ENH Only query primary DB

src/Model/HybridSessionDataObject.php

@@ -20,4 +20,10 @@ class HybridSessionDataObject extends DataObject
     ];
 
     private static $table_name = 'HybridSessionDataObject';
+
+    /**
+     * Ensure there is no risk of reading from an unsynced database replica so
+     * that session data is always up to date.
+     */
+    private static bool $must_use_primary_db = true;
 }

src/Store/DatabaseStore.php

@@ -68,7 +68,7 @@ public function read(string $session_id): string|false
             $this->getNow()
         );
 
-        $result = DB::query($query);
+        $result = DB::withPrimary(fn() => DB::query($query));
 
         if ($result && $result->numRecords()) {
             $data = $result->record();