switch to postgresql

internal/httpapp/app.go

@@ -26,7 +26,7 @@ type Config struct {
 	Addr         string
 	TemplatesDir string
 	StaticDir    string
-	DatabasePath string // Path to SQLite database (empty = in-memory mode)
+	DatabaseConn string // Database connection string (SQLite path or PostgreSQL connection string, empty = in-memory mode)
 }
 
 type App struct {
@@ -103,8 +103,8 @@ func New(cfg Config) (*App, error) {
 
 	// Initialize database (optional)
 	var database *db.DB
-	if cfg.DatabasePath != "" {
-		dbConn, err := db.New(cfg.DatabasePath)
+	if cfg.DatabaseConn != "" {
+		dbConn, err := db.New(cfg.DatabaseConn)
 		if err != nil {
 			return nil, fmt.Errorf("init database: %w", err)
 		}