🪙 feat: Assistants Token Balance & other improvements (#2114)

* chore: add assistants to supportsBalanceCheck

* feat(Transaction): getTransactions and refactor export of model

* refactor: use enum: ViolationTypes.TOKEN_BALANCE

* feat(assistants): check balance

* refactor(assistants): only add promptBuffer if new convo (for title), and remove endpoint definition

* refactor(assistants): Count tokens up to the current context window

* fix(Switcher): make Select list explicitly controlled

* feat(assistants): use assistant's default model when no model is specified instead of the last selected assistant, prevent assistant_id from being recorded in non-assistant endpoints

* chore(assistants/chat): import order

* chore: bump librechat-data-provider due to changes

api/models/Transaction.js

@@ -50,4 +50,23 @@ transactionSchema.statics.create = async function (transactionData) {
   };
 };
 
-module.exports = mongoose.model('Transaction', transactionSchema);
+const Transaction = mongoose.model('Transaction', transactionSchema);
+
+/**
+ * Queries and retrieves transactions based on a given filter.
+ * @async
+ * @function getTransactions
+ * @param {Object} filter - MongoDB filter object to apply when querying transactions.
+ * @returns {Promise<Array>} A promise that resolves to an array of matched transactions.
+ * @throws {Error} Throws an error if querying the database fails.
+ */
+async function getTransactions(filter) {
+  try {
+    return await Transaction.find(filter).lean();
+  } catch (error) {
+    console.error('Error querying transactions:', error);
+    throw error;
+  }
+}
+
+module.exports = { Transaction, getTransactions };

api/models/checkBalance.js

@@ -1,5 +1,6 @@
+const { ViolationTypes } = require('librechat-data-provider');
+const { logViolation } = require('~/cache');
 const Balance = require('./Balance');
-const { logViolation } = require('../cache');
 /**
  * Checks the balance for a user and determines if they can spend a certain amount.
  * If the user cannot spend the amount, it logs a violation and denies the request.
@@ -25,7 +26,7 @@ const checkBalance = async ({ req, res, txData }) => {
     return true;
   }
 
-  const type = 'token_balance';
+  const type = ViolationTypes.TOKEN_BALANCE;
   const errorMessage = {
     type,
     balance,

api/models/index.js

@@ -22,14 +22,12 @@ const Key = require('./Key');
 const User = require('./User');
 const Session = require('./Session');
 const Balance = require('./Balance');
-const Transaction = require('./Transaction');
 
 module.exports = {
   User,
   Key,
   Session,
   Balance,
-  Transaction,
 
   hashPassword,
   updateUser,

api/models/spendTokens.js

@@ -1,4 +1,4 @@
-const Transaction = require('./Transaction');
+const { Transaction } = require('./Transaction');
 const { logger } = require('~/config');
 
 /**