feat: Add endpoint and service logic to delete conversations and their associated messages.

src/messages/messages.service.ts

@@ -598,6 +598,42 @@ export class MessagesService {
     };
   }
 
+  /**
+   * Delete a conversation and all its messages
+   */
+  async deleteConversation(conversationId: string, userId: string) {
+    const conversation = await this.prisma.conversation.findUnique({
+      where: { id: conversationId },
+      include: {
+        agentProfile: {
+          select: { userId: true },
+        },
+      },
+    });
+
+    if (!conversation) {
+      throw new NotFoundException('Conversation not found');
+    }
+
+    const isUser = conversation.userId === userId;
+    const isAgent = conversation.agentProfile.userId === userId;
+
+    if (!isUser && !isAgent) {
+      throw new ForbiddenException('You are not part of this conversation');
+    }
+
+    // Delete all messages first, then the conversation
+    await this.prisma.message.deleteMany({
+      where: { conversationId },
+    });
+
+    await this.prisma.conversation.delete({
+      where: { id: conversationId },
+    });
+
+    return null;
+  }
+
   /**
    * Get total unread count for a user across all conversations
    */