Refactor bulk transaction handling in bulk.put.js to use bulk upsert operations

- Updated the transaction processing logic to clear existing transactions and perform bulk upserts instead of inserts.
- Enhanced the response to include counts of upserted and modified transactions.

server/api/transactions/bulk.put.js

@@ -5,12 +5,15 @@ export default defineEventHandler(async (event) => {
     const transactions = await readBody(event)
     const collection = await getCollection('transactions')
     
-    // Clear existing transactions and insert new ones
+    // Clear existing transactions and upsert new ones
     await collection.deleteMany({})
     
     if (transactions.length > 0) {
-      // Convert transactions for MongoDB
+      // Convert transactions for MongoDB and use bulk upsert operations
-      const mongoTransactions = transactions.map(transaction => ({
+      const bulkOps = transactions.map(transaction => ({
+        replaceOne: {
+          filter: { _id: transaction.id },
+          replacement: {
             ...transaction,
             _id: transaction.id,
             id: undefined,
@@ -18,13 +21,17 @@ export default defineEventHandler(async (event) => {
             endDate: transaction.endDate ? new Date(transaction.endDate) : null,
             createdAt: new Date(),
             updatedAt: new Date()
+          },
+          upsert: true
+        }
       }))
       
-      const result = await collection.insertMany(mongoTransactions)
+      const result = await collection.bulkWrite(bulkOps)
       
       return {
         success: true,
-        insertedCount: result.insertedCount
+        insertedCount: result.upsertedCount,
+        modifiedCount: result.modifiedCount
       }
     }