Add SQLite transactions

ocdb.cpp

@@ -56,7 +56,7 @@ bool OCdb::init(std::string dump_path) {
 	json j;
 	file >> j;
 	revision = j["revision"];
-
+	request("BEGIN TRANSACTION;");
 	request("INSERT INTO revision VALUES (" + std::to_string(revision) + ");");
 
 	for (auto& el : j["data_files"].items()) {
@@ -85,14 +85,15 @@ bool OCdb::update(Okapi& oc) {
 	std::string output = oc.get_changelog_json(revision);
 	json j = json::parse(output);
 
+	request("BEGIN TRANSACTION;");
 	for (auto& el : j["changelog"].items()) {
 		parse_item(el.value());
 	}
 	revision = j["revision"];
+	request("UPDATE revision SET revision = " + std::to_string(revision) + ';');
+	request("COMMIT");
 	if (j["more"])
 		update(oc);
-	else
-		request("UPDATE revision SET revision = " + std::to_string(revision) + ';');
 	return 1;
 }