preliminary work for image locking

ext/upgrade/main.php

@@ -3,20 +3,24 @@
 class Upgrade implements Extension {
 	public function receive_event(Event $event) {
 		if($event instanceof InitExtEvent) {
-			$this->do_things();
+			$this->do_things($event->context);
 		}
 	}
 
-	private function do_things() {
-		global $config;
-		global $database;
+	private function do_things($context) {
+		$config = $context->config;
+		$database = $context->database;
 
 		if(!is_numeric($config->get_string("db_version"))) {
 			$config->set_int("db_version", 2);
 		}
 
 		if($config->get_int("db_version") < 6) {
-			$database->upgrade_schema("ext/upgrade/schema.xml");
+			// cry :S
+		}
+
+		if($config->get_int("db_version") < 6) { // 7
+			// add column image->locked
 		}
 	}
 }

install.php

@@ -187,6 +187,7 @@ function create_tables($dsn) { // {{{
 			width INTEGER NOT NULL,
 			height INTEGER NOT NULL,
 			posted TIMESTAMP NOT NULL DEFAULT SCORE_NOW,
+			locked SCORE_BOOL NOT NULL DEFAULT SCORE_BOOL_N,
 			INDEX(owner_id),
 			INDEX(width),
 			INDEX(height),