[Bug]: Previous conversations missing custom icons and model spec on v0.7.5

[bstanic]

What happened?

We use custom icons for various models. Since the upgrade to version 0.7.5, the saved chats are missing custom model icons after the chat is saved. Also, the model spec is not saved either so when continuing conversation it shows as "None selected".

I suspected that some of the data is not recorded in the DB. So I ran a test with 0.7.4 and then with 0.7.5 and noticed that there is missing data in the 'conversations' collection. Some of the missing fields are spec: and iconURL: but there is more.

Example using version 0.7.4:

{
	"_id" : ObjectId("673aedf38452abac33969696"),
	"conversationId" : "52cac484-1321-4576-8e7a-5bae4ecfddd3",
	"user" : "671ef534b28a596957f7bf3f",
	"__v" : 0,
	"chatGptLabel" : "ChatGPT-4o",
	"createdAt" : ISODate("2024-11-18T07:34:11.980Z"),
	"endpoint" : "azureOpenAI",
	"frequency_penalty" : 0,
	"iconURL" : "https://example-site.net/assets/icon-gpt.png",
	"imageDetail" : "auto",
	"isArchived" : false,
	"messages" : [
		ObjectId("673aedf38452abac33969695"),
		ObjectId("673aedf48452abac33969697"),
		ObjectId("673aee3c8452abac33969698"),
		ObjectId("673aee3d8452abac33969699")
	],
	"model" : "gpt-4o",
	"presence_penalty" : 0,
	"promptPrefix" : null,
	"resendFiles" : true,
	"spec" : "gpt-4o",
	"tags" : [ ],
	"temperature" : 1,
	"title" : "New Chat",
	"top_p" : 1,
	"updatedAt" : ISODate("2024-11-18T07:35:25.745Z")
}

Example (broken icons and empty model selections) on 0.7.5:

{
	"_id" : ObjectId("673aef3caac9e3027061653f"),
	"user" : "671ef534b28a596957f7bf3f",
	"conversationId" : "dc3cb9b5-de11-44d3-a063-7b0930f0d953",
	"__v" : 0,
	"createdAt" : ISODate("2024-11-18T07:39:40.120Z"),
	"endpoint" : "azureOpenAI",
	"isArchived" : false,
	"messages" : [
		ObjectId("673aef3caac9e3027061653e"),
		ObjectId("673aef3eaac9e30270616540")
	],
	"model" : "gpt-4o",
	"resendFiles" : true,
	"tags" : [ ],
	"title" : "Test of the Test",
	"updatedAt" : ISODate("2024-11-18T07:39:42.273Z")
}

Issue seems to be with recording all the fields in the DB in the version 0.7.5

Steps to Reproduce

1. Run version 0.7.4 with customization file as per the LibreChat documentation
2. Do some test chats
3. Upgrade to version 0.7.5
4. Do some more test chats.
5. Observe that old chats still have correct icons and model spec in history, but the new one created post upgrade do not.

What browsers are you seeing the problem on?

No response

Relevant log output

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Screenshots

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