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

@@ -5,26 +5,33 @@ 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
-      const mongoTransactions = transactions.map(transaction => ({
-        ...transaction,
-        _id: transaction.id,
-        id: undefined,
-        date: new Date(transaction.date),
-        endDate: transaction.endDate ? new Date(transaction.endDate) : null,
-        createdAt: new Date(),
-        updatedAt: new Date()
+      // Convert transactions for MongoDB and use bulk upsert operations
+      const bulkOps = transactions.map(transaction => ({
+        replaceOne: {
+          filter: { _id: transaction.id },
+          replacement: {
+            ...transaction,
+            _id: transaction.id,
+            id: undefined,
+            date: new Date(transaction.date),
+            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
       }
     }