Setup database and Data directory

backend/main.go

@@ -36,7 +36,20 @@ func main() {
 		os.Exit(1)
 	}
 
-	db := database()
+	// Setup data directory
+	dataDir, err := setupDataDir()
+	if err != nil {
+		slog.Error("Cannot set data directory: %s; %w", os.Getenv("DATA_DIR"), err)
+		os.Exit(1)
+	}
+
+	// Setup database connection
+	dbConnection, err := NewDatabaseConnection(dataDir, "app.db")
+	if err != nil {
+		slog.Error("Databse error", "error", err)
+		os.Exit(1)
+	}
+	db := database(dbConnection)
 	defer db.Close()
 
 	// Create App