All: Save size of a resource to the database; and added mechanism to run non-database migrations

ReactNativeClient/lib/models/Migration.js

@@ -0,0 +1,27 @@
+const BaseModel = require('lib/BaseModel.js');
+
+const migrationScripts = {
+	20: require('lib/migrations/20.js'),
+};
+
+class Migration extends BaseModel {
+
+	static tableName() {
+		return 'migrations';
+	}
+
+	static modelType() {
+		return BaseModel.TYPE_MIGRATION;
+	}
+
+	static migrationsToDo() {
+		return this.modelSelectAll('SELECT * FROM migrations ORDER BY number ASC');
+	}
+
+	static script(number) {
+		return migrationScripts[number];
+	}
+
+}
+
+module.exports = Migration;