Feat: Added Multi-Message Support (#381)

* feat: Added Multi-Message Support Feature

* feat: Added Multi-Message Support Feature

Author: abdegenius

backend/migrations/20260328000000_add_vault_id_to_legacy_messages.sql

@@ -0,0 +1,7 @@
+-- Associate legacy messages with vaults to support multiple messages per vault
+
+ALTER TABLE legacy_messages
+    ADD COLUMN IF NOT EXISTS vault_id BIGINT;
+
+CREATE INDEX IF NOT EXISTS idx_legacy_messages_vault
+    ON legacy_messages(vault_id, created_at DESC);

backend/src/app.rs

@@ -132,6 +132,10 @@ pub async fn create_app(db: PgPool, config: Config) -> Result<Router, ApiError>
             "/api/messages/legacy",
             post(create_legacy_message).get(list_legacy_messages),
         )
+        .route(
+            "/api/messages/legacy/vault/:vault_id",
+            get(list_vault_legacy_messages),
+        )
         .route("/api/admin/messages/keys", get(list_message_keys))
         .route("/api/admin/messages/keys/rotate", post(rotate_message_key))
         .route(
@@ -579,6 +583,18 @@ async fn list_legacy_messages(
     ))
 }
 
+async fn list_vault_legacy_messages(
+    State(state): State<Arc<AppState>>,
+    Path(vault_id): Path<i64>,
+    AuthenticatedUser(user): AuthenticatedUser,
+) -> Result<Json<Value>, ApiError> {
+    let messages =
+        MessageEncryptionService::list_vault_messages(&state.db, user.user_id, vault_id).await?;
+    Ok(Json(
+        json!({ "status": "success", "data": messages, "count": messages.len() }),
+    ))
+}
+
 async fn list_message_keys(
     State(state): State<Arc<AppState>>,
     AuthenticatedAdmin(_admin): AuthenticatedAdmin,