From https://once.com/writebook

config/initializers/sqlite3.rb

@@ -0,0 +1,17 @@
+module SQLite3Configuration
+  private
+    def configure_connection
+      super
+
+      if @config[:retries]
+        retries = self.class.type_cast_config_to_integer(@config[:retries])
+        raw_connection.busy_handler do |count|
+          (count <= retries).tap { |result| sleep count * 0.001 if result }
+        end
+      end
+    end
+end
+
+ActiveSupport.on_load :active_record do
+  ActiveRecord::ConnectionAdapters::SQLite3Adapter.prepend SQLite3Configuration
+end