migrate to table based tinydb

NOTE to migrate database install tinydb & run migrate.py

- added new functions to filter data with db queries
- in the storage module

webapp/routes/structures.py

@@ -3,7 +3,7 @@ import uuid, time
 from typing import List, Dict, Any
 from flask import Blueprint, render_template, request, redirect, url_for
 
-from webapp.storage.orders import load_orders, add_order, mark_done
+from webapp.storage.orders import load_pending,load_done, add_order, mark_done
 from webapp.services.blueprints import resolve_blueprint_id
 
 bp = Blueprint("structures", __name__)
@@ -16,12 +16,7 @@ REAC_STRUCTS= ["Athanor", "Tatara"]
 REAC_RIGS   = ["None", "T1", "T2"]
 
 def _split_orders() -> Dict[str, List[Dict[str, Any]]]:
-    orders = load_orders()
-    open_orders = [o for o in orders if o.get("status") == "open"]
-    done_orders = [o for o in orders if o.get("status") == "done"]
-    open_orders.sort(key=lambda o: o.get("created_at",""), reverse=True)
-    done_orders.sort(key=lambda o: o.get("done_at","") or "", reverse=True)
-    return {"open": open_orders, "done": done_orders}
+    return {"open": load_pending(), "done": load_done()}
 
 @bp.route("/strukturen", methods=["GET", "POST"])
 def structures():