Initial move

backend/types.ts

@@ -0,0 +1,21 @@
+export interface Channel {
+    id: number;
+    name: string;
+    created_at: string;
+}
+
+export interface Message {
+    id: number;
+    channel_id: number;
+    content: string;
+    created_at: string;
+}
+
+export interface File {
+    id: number;
+    channel_id: number;
+    message_id: number;
+    file_path: string;
+    file_type: string;
+    created_at: string;
+}