fixes

server/cmd/main.go

@@ -17,13 +17,13 @@ import (
 
 func main() {
 	mongoURI := getEnv("MONGO_URI", "mongodb://localhost:27017")
-	dbName := getEnv("MONGO_DB", "vantage")
 
 	if os.Getenv("GRPC_HOST") == "" {
 		log.Fatal("GRPC_HOST is required (host:port agents dial for gRPC)")
 	}
 
-	if err := db.Connect(mongoURI, dbName); err != nil {
+	// DB name comes from the MONGO_URI path; "vantage" is the fallback.
+	if err := db.Connect(mongoURI, "vantage"); err != nil {
 		log.Fatalf("failed to connect to MongoDB: %v", err)
 	}
 	log.Println("connected to MongoDB")