forgot to put new api docs and fixed a bug with duplicates

main.go

@@ -9,6 +9,7 @@ import (
 	"log"
 	"net/http"
 	"os"
+	"slices"
 	"strconv"
 	"strings"
 	"time"
@@ -267,8 +268,20 @@ func main() {
 			return
 		}
 
-		if tx := db.Create(game); tx.Error != nil {
-			sendError(w, "failed to create game", err, 400)
+		if tx := db.First(&model.Game{SteamAppID: game.SteamAppID}); tx.Error != nil {
+			// game doesn't exist in db, gonna create it real quick
+			if tx := db.Create(game); tx.Error != nil {
+				sendError(w, "failed to create game", err, 400)
+				return
+			}
+		}
+
+		alreadyHasGame := !slices.ContainsFunc(user.Games, func(g model.Game) bool {
+			return g.SteamAppID == game.SteamAppID
+		})
+		if !alreadyHasGame {
+			// user already has this game on the wishlist
+			sendError(w, "game is already on the wishlist", nil, 400)
 			return
 		}