feat(inventory): add mandatory per-section date pickers, prevent future dates, sync transfer dates, and sort by transaction_date

backend/app/routers/inventory.py

@@ -217,6 +217,7 @@ def transaction_to_dict(tx: InventoryTransaction, wh: Warehouse | None = None) -
         "performed_by": tx.performed_by,
         "delivered_to": tx.delivered_to,
         "transaction_date": to_iso(tx.transaction_date),
+        "created_at": to_iso(tx.created_at) if hasattr(tx, "created_at") and tx.created_at else None,
         "note": tx.note,
     }
 
@@ -461,7 +462,10 @@ async def list_transactions(
             InventoryTransaction.transaction_date
             < datetime.fromisoformat(date_to).replace(tzinfo=timezone.utc) + timedelta(days=1)
         )
-    stmt = sort_query(stmt, InventoryTransaction, sort, default="-transaction_date")
+    if not sort or sort == "-transaction_date":
+        stmt = stmt.order_by(InventoryTransaction.transaction_date.desc(), InventoryTransaction.created_at.desc())
+    else:
+        stmt = sort_query(stmt, InventoryTransaction, sort, default="-transaction_date")
     items, meta = await paginate(stmt, page, page_size, db)
 
     # Enrich: warehouse name + material/brand/specs/unit for the UI rows.

backend/app/services/inventory_service.py

@@ -22,6 +22,7 @@ SHA256 of the sorted canonical specs JSON (or 'default' when empty).
 import hashlib
 import json
 import uuid
+from datetime import datetime, timezone
 from decimal import Decimal
 
 from sqlalchemy import select
@@ -175,6 +176,7 @@ async def apply_transaction(
     t = payload.transaction_type
     specs = payload.specs or {}
     specs_hash = canonical_specs_hash(specs)
+    tx_date = payload.transaction_date or datetime.now(timezone.utc)
 
     # STOCK_COUNT: apply the difference between counted and recorded quantity.
     if t == "STOCK_COUNT":
@@ -197,7 +199,7 @@ async def apply_transaction(
             recorded_qty=recorded,
             physical_qty=payload.physical_qty,
             performed_by=performed_by,
-            transaction_date=payload.transaction_date,
+            transaction_date=tx_date,
             note=payload.note,
         )
         db.add(tx)
@@ -238,7 +240,7 @@ async def apply_transaction(
             quantity=-quantity,
             transfer_pair_id=pair_id,
             performed_by=performed_by,
-            transaction_date=payload.transaction_date,
+            transaction_date=tx_date,
             note=payload.note,
         )
         db.add(out_tx)
@@ -256,7 +258,7 @@ async def apply_transaction(
             quantity=quantity,
             transfer_pair_id=pair_id,
             performed_by=performed_by,
-            transaction_date=payload.transaction_date,
+            transaction_date=tx_date,
             note=payload.note,
         )
         db.add(in_tx)
@@ -291,7 +293,7 @@ async def apply_transaction(
             quantity=quantity,
             performed_by=performed_by,
             delivered_to=payload.delivered_to,
-            transaction_date=payload.transaction_date,
+            transaction_date=tx_date,
             note=payload.note,
         )
         db.add(tx)
@@ -321,7 +323,7 @@ async def apply_transaction(
             quantity=-quantity,
             performed_by=performed_by,
             delivered_to=payload.delivered_to,
-            transaction_date=payload.transaction_date,
+            transaction_date=tx_date,
             note=payload.note,
         )
         db.add(tx)