added logic to handle backwards compatibility with old schemaDate method of tracking upgrade scripts

src/upgrade.js

@@ -150,14 +150,26 @@ Upgrade.runSingle = function (query, callback) {
 Upgrade.process = function (files, skipCount, callback) {
 	process.stdout.write('OK'.green + ' | '.reset + String(files.length).cyan + ' script(s) found'.cyan + (skipCount > 0 ? ', '.cyan + String(skipCount).cyan + ' skipped'.cyan : '') + '\n'.reset);
 
+	async.waterfall([
+		async.apply(db.get, 'schemaDate'),
+		function (schemaDate, next) {
+			var schemaTime = new Date(schemaDate);
+
 			async.eachSeries(files, function (file, next) {
 				var scriptExport = require(file);
 				var date = new Date(scriptExport.timestamp);
 
 				process.stdout.write('  → '.white + String('[' + [date.getUTCFullYear(), date.getUTCMonth() + 1, date.getUTCDate()].join('/') + '] ').gray + String(scriptExport.name).reset + '... ');
 
+				// For backwards compatibility, cross-reference with schemaDate (if found). If a script's date is older, skip it
+				if (scriptExport.timestamp <= schemaTime) {
+					process.stdout.write('skipped\n'.grey);
+					db.sortedSetAdd('schemaLog', Date.now(), path.basename(file, '.js'));
+					return next();
+				}
+
 				// Do the upgrade...
-		scriptExport.method(function (err) {
+				scriptExport.method(function (err, skipped) {
 					if (err) {
 						process.stdout.write('error\n'.red);
 						return next(err);
@@ -171,12 +183,14 @@ Upgrade.process = function (files, skipCount, callback) {
 				});
 			}, function (err) {
 				if (err) {
-			return callback(err);
+					return next(err);
 				}
 
 				process.stdout.write('Upgrade complete!\n\n'.green);
-		callback();
+				next();
 			});
+		},
+	], callback);
 };
 
 module.exports = Upgrade;