Implement draft Multi-Entry Transaction Commit Functionality

New helper function `commit` to handle the simultaneous transaction commit for multiple entries

src/helper/commit.ts

@@ -0,0 +1,18 @@
+import Entry from "../Entry";
+import { TransactionError } from "../errors";
+import * as mongoose from "mongoose";
+
+export async function commit(...entries: Entry[]) {
+  const mongooseSession = await mongoose.startSession();
+  try {
+    mongooseSession.startTransaction();
+    const journals = await Promise.all(entries.map(entry => entry.commit()));
+    await mongooseSession.commitTransaction();
+    return journals;
+  } catch (error) {
+    await mongooseSession.abortTransaction();
+    throw new TransactionError(`Failure to commit entries: ${(error as Error).message}`, entries.length,500);
+  } finally {
+    await mongooseSession.endSession();
+  }
+}