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---
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description: Controller for loading chat messages for users and groups with pagination.
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---
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# ChatLoadController
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### Controller Description
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* **Route**: `api/chats`
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* **Authorize**: Requires authenticated user with roles "Admin" or "User" (`[Authorize(Roles = "Admin, User")]`).
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### Endpoints
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#### <mark style="color:$info;">GetGroupMessages</mark>
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* **Description**: Retrieves messages from a specified group chat with pagination.
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* **Route**: `[GET] api/chats/group-messages`
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* **HTTP Method**: `GET`
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* **Request**:
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* **Path Parameter**: `chatId` (Guid, required): ID of the group chat.
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* **Query Parameter**: `query` (`MessageQuery`, required) with:
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* `startMessageId` (Guid?, optional): ID of the starting message.
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* `before` (int, default=20): Number of messages before the start.
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* `after` (int, default=2): Number of messages after the start.
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* **Responses**:
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* <mark style="color:$success;">**200 OK**</mark>: Returns a list of group chat messages.
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```json
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[
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{
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"id": "Guid",
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"senderId": "Guid",
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"recipientId": "Guid",
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"recipientType": "string",
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"encryptedContent": "string",
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"sentAt": "DateTime",
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"isEdited": "boolean",
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"editedAt": "DateTime?",
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"replyToMessageId": "Guid?",
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"mediaAttachments": [
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{
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"id": "Guid",
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"messageId": "Guid",
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"mediaFileId": "Guid"
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}
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],
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"reactions": [
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{
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"id": "Guid",
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"messageId": "Guid",
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"userId": "Guid",
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"reactionCode": "string",
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"reactedAt": "DateTime"
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}
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],
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"messageViews": [
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{
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"id": "Guid",
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"messageId": "Guid",
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"userId": "Guid",
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"viewedAt": "DateTime"
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}
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]
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}
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]
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```
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* <mark style="color:$danger;">**400 Bad Request**</mark>:
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* If `before` or `after` is negative or total exceeds 100: `"Values must be non-negative and total must not exceed 100."`
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* If an argument or resource is invalid: `"string"`
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* <mark style="color:$danger;">**403 Forbidden**</mark>: If user lacks authorization.
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```json
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"string"
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```
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* <mark style="color:$warning;">**500 Internal Server Error**</mark>: Indicates an unexpected error.
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```json
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"Unexpected Error! Please try again later."
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```
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#### <mark style="color:$info;">GetUserMessages</mark>
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* **Description**: Retrieves messages from a specified user chat with pagination.
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* **Route**: `[GET] api/chats/user-messages`
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* **HTTP Method**: `GET`
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* **Request**:
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* **Path Parameter**: `userId` (Guid, required): ID of the target user.
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* **Query Parameter**: `query` (`MessageQuery`, required) with:
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* `startMessageId` (Guid?, optional): ID of the starting message.
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* `before` (int, default=20): Number of messages before the start.
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* `after` (int, default=2): Number of messages after the start.
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* **Responses**:
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* **200 OK**: Returns a list of user chat messages.
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```json
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[
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{
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"id": "Guid",
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"senderId": "Guid",
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"recipientId": "Guid",
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"recipientType": "string",
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"encryptedContent": "string",
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"sentAt": "DateTime",
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"isEdited": "boolean",
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"editedAt": "DateTime?",
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"replyToMessageId": "Guid?",
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"mediaAttachments": [
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{
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"id": "Guid",
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"messageId": "Guid",
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"mediaFileId": "Guid"
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}
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],
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"reactions": [
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{
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"id": "Guid",
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"messageId": "Guid",
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"userId": "Guid",
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"reactionCode": "string",
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"reactedAt": "DateTime"
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}
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],
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"messageViews": [
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{
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"id": "Guid",
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"messageId": "Guid",
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"userId": "Guid",
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"viewedAt": "DateTime"
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}
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]
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}
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]
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```
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* **400 Bad Request**:
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* If `before` or `after` is negative or total exceeds 100: `"Values must be non-negative and total must not exceed 100."`
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* If an operation or resource is invalid: `"string"`
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* **403 Forbidden**: If user lacks authorization.
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```json
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"string"
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```
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* **500 Internal Server Error**: Indicates an unexpected error.
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```json
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"Unexpected Error! Please try again later."
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```
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### Data Models
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#### MessageQuery
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* **Description**: Model for pagination query parameters.
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* **Structure**:
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```json
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{
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"startMessageId": "Guid?",
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"before": "int",
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"after": "int"
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}
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```
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#### MessageResponse
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* **Description**: Data transfer object for chat message details.
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* **Structure**:
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```json
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{
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"id": "Guid",
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"senderId": "Guid",
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"recipientId": "Guid",
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"recipientType": "string",
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"encryptedContent": "string",
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"sentAt": "DateTime",
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"isEdited": "boolean",
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"editedAt": "DateTime?",
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"replyToMessageId": "Guid?",
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"mediaAttachments": [
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{
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"id": "Guid",
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"messageId": "Guid",
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"mediaFileId": "Guid"
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}
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],
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"reactions": [
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{
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"id": "Guid",
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"messageId": "Guid",
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"userId": "Guid",
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"reactionCode": "string",
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"reactedAt": "DateTime"
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}
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],
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"messageViews": [
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{
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"id": "Guid",
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"messageId": "Guid",
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"userId": "Guid",
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"viewedAt": "DateTime"
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}
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]
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}
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```
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#### MediaAttachmentResponse
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* **Description**: Data transfer object for media attachments in messages.
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* **Structure**:
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```json
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{
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"id": "Guid",
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"messageId": "Guid",
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"mediaFileId": "Guid"
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}
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```
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#### MessageReactionResponse
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* **Description**: Data transfer object for message reactions.
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* **Structure**:
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```json
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{
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"id": "Guid",
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"messageId": "Guid",
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"userId": "Guid",
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"reactionCode": "string",
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"reactedAt": "DateTime"
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}
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```
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#### MessageViewResponse
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* **Description**: Data transfer object for message view tracking.
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* **Structure**:
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```json
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{
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"id": "Guid",
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"messageId": "Guid",
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"userId": "Guid",
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"viewedAt": "DateTime"
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}
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```
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### Error Handling
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* **Invalid User ID**: Handled by `ICurrentUserService`, aborts if invalid.
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* **Invalid Operations**: Returns `400 Bad Request` for negative values, total exceeding 100, or `InvalidOperationException`.
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* **Unauthorized Access**: Returns `403 Forbidden` for `UnauthorizedAccessException`.
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* **Resource Not Found**: Returns `400 Bad Request` for `NotFoundException`.
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* **Unexpected Errors**: Caught and returned as `500 Internal Server Error`.
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### Logging
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* Logs warnings for `UnauthorizedAccessException`, `NotFoundException`, `ArgumentException`, and `InvalidOperationException`.
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* Logs errors for unexpected exceptions.
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