📦 refactor: Consolidate DB models, encapsulating Mongoose usage in data-schemas (#11830)

* chore: move database model methods to /packages/data-schemas

* chore: add TypeScript ESLint rule to warn on unused variables

* refactor: model imports to streamline access

- Consolidated model imports across various files to improve code organization and reduce redundancy.
- Updated imports for models such as Assistant, Message, Conversation, and others to a unified import path.
- Adjusted middleware and service files to reflect the new import structure, ensuring functionality remains intact.
- Enhanced test files to align with the new import paths, maintaining test coverage and integrity.

* chore: migrate database models to packages/data-schemas and refactor all direct Mongoose Model usage outside of data-schemas

* test: update agent model mocks in unit tests

- Added `getAgent` mock to `client.test.js` to enhance test coverage for agent-related functionality.
- Removed redundant `getAgent` and `getAgents` mocks from `openai.spec.js` and `responses.unit.spec.js` to streamline test setup and reduce duplication.
- Ensured consistency in agent mock implementations across test files.

* fix: update types in data-schemas

* refactor: enhance type definitions in transaction and spending methods

- Updated type definitions in `checkBalance.ts` to use specific request and response types.
- Refined `spendTokens.ts` to utilize a new `SpendTxData` interface for better clarity and type safety.
- Improved transaction handling in `transaction.ts` by introducing `TransactionResult` and `TxData` interfaces, ensuring consistent data structures across methods.
- Adjusted unit tests in `transaction.spec.ts` to accommodate new type definitions and enhance robustness.

* refactor: streamline model imports and enhance code organization

- Consolidated model imports across various controllers and services to a unified import path, improving code clarity and reducing redundancy.
- Updated multiple files to reflect the new import structure, ensuring all functionalities remain intact.
- Enhanced overall code organization by removing duplicate import statements and optimizing the usage of model methods.

* feat: implement loadAddedAgent and refactor agent loading logic

- Introduced `loadAddedAgent` function to handle loading agents from added conversations, supporting multi-convo parallel execution.
- Created a new `load.ts` file to encapsulate agent loading functionalities, including `loadEphemeralAgent` and `loadAgent`.
- Updated the `index.ts` file to export the new `load` module instead of the deprecated `loadAgent`.
- Enhanced type definitions and improved error handling in the agent loading process.
- Adjusted unit tests to reflect changes in the agent loading structure and ensure comprehensive coverage.

* refactor: enhance balance handling with new update interface

- Introduced `IBalanceUpdate` interface to streamline balance update operations across the codebase.
- Updated `upsertBalanceFields` method signatures in `balance.ts`, `transaction.ts`, and related tests to utilize the new interface for improved type safety.
- Adjusted type imports in `balance.spec.ts` to include `IBalanceUpdate`, ensuring consistency in balance management functionalities.
- Enhanced overall code clarity and maintainability by refining type definitions related to balance operations.

* feat: add unit tests for loadAgent functionality and enhance agent loading logic

- Introduced comprehensive unit tests for the `loadAgent` function, covering various scenarios including null and empty agent IDs, loading of ephemeral agents, and permission checks.
- Enhanced the `initializeClient` function by moving `getConvoFiles` to the correct position in the database method exports, ensuring proper functionality.
- Improved test coverage for agent loading, including handling of non-existent agents and user permissions.

* chore: reorder memory method exports for consistency

- Moved `deleteAllUserMemories` to the correct position in the exported memory methods, ensuring a consistent and logical order of method exports in `memory.ts`.

api/server/routes/__tests__/convos.spec.js

@@ -31,20 +31,14 @@ jest.mock('@librechat/data-schemas', () => ({
   })),
 }));
 
-jest.mock('~/models/Conversation', () => ({
+jest.mock('~/models', () => ({
   getConvosByCursor: jest.fn(),
   getConvo: jest.fn(),
   deleteConvos: jest.fn(),
   saveConvo: jest.fn(),
-}));
-
-jest.mock('~/models/ToolCall', () => ({
-  deleteToolCalls: jest.fn(),
-}));
-
-jest.mock('~/models', () => ({
   deleteAllSharedLinks: jest.fn(),
   deleteConvoSharedLink: jest.fn(),
+  deleteToolCalls: jest.fn(),
 }));
 
 jest.mock('~/server/middleware/requireJwtAuth', () => (req, res, next) => next());
@@ -108,9 +102,13 @@ jest.mock('~/server/services/Endpoints/assistants', () => ({
 describe('Convos Routes', () => {
   let app;
   let convosRouter;
-  const { deleteAllSharedLinks, deleteConvoSharedLink } = require('~/models');
-  const { deleteConvos, saveConvo } = require('~/models/Conversation');
-  const { deleteToolCalls } = require('~/models/ToolCall');
+  const {
+    deleteAllSharedLinks,
+    deleteConvoSharedLink,
+    deleteToolCalls,
+    deleteConvos,
+    saveConvo,
+  } = require('~/models');
 
   beforeAll(() => {
     convosRouter = require('../convos');
@@ -520,7 +518,7 @@ describe('Convos Routes', () => {
       expect(response.status).toBe(200);
       expect(response.body).toEqual(mockArchivedConvo);
       expect(saveConvo).toHaveBeenCalledWith(
-        expect.objectContaining({ user: { id: 'test-user-123' } }),
+        expect.objectContaining({ userId: 'test-user-123' }),
         { conversationId: mockConversationId, isArchived: true },
         { context: `POST /api/convos/archive ${mockConversationId}` },
       );
@@ -549,7 +547,7 @@ describe('Convos Routes', () => {
       expect(response.status).toBe(200);
       expect(response.body).toEqual(mockUnarchivedConvo);
       expect(saveConvo).toHaveBeenCalledWith(
-        expect.objectContaining({ user: { id: 'test-user-123' } }),
+        expect.objectContaining({ userId: 'test-user-123' }),
         { conversationId: mockConversationId, isArchived: false },
         { context: `POST /api/convos/archive ${mockConversationId}` },
       );