feat: use pgxpool in backend

modules/backend/main.go

@@ -13,7 +13,7 @@ import (
 
 	"github.com/gin-contrib/cors"
 	"github.com/gin-gonic/gin"
-	"github.com/jackc/pgx/v5"
+	"github.com/jackc/pgx/v5/pgxpool"
 	"github.com/pelletier/go-toml/v2"
 )
 
@@ -31,17 +31,17 @@ func main() {
 	// 	log.Fatalf("Failed to init config: %v\n", err)
 	// }
 
-	conn, err := pgx.Connect(context.Background(), os.Getenv("DATABASE_URL"))
+	pool, err := pgxpool.New(context.Background(), os.Getenv("DATABASE_URL"))
 	if err != nil {
 		fmt.Fprintf(os.Stderr, "Unable to connect to database: %v\n", err)
 		os.Exit(1)
 	}
 
-	defer conn.Close(context.Background())
+	defer pool.Close()
 
 	r := gin.Default()
 
-	queries := sqlc.New(conn)
+	queries := sqlc.New(pool)
 
 	server := handlers.NewServer(queries)
 	// r.LoadHTMLGlob("templates/*")