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

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)