fix initial balance logic and add edit for cycle data

backend/apps/operations/services/feed_sacks.py

@@ -7,8 +7,8 @@ from apps.operations.models import FeedSacks
 
 
 def recompute_feed_sack_in_totals(cycle: Cycle) -> None:
-    """Rebuild cumulative in_total from the cycle opening balance plus daily IoT in."""
-    running = cycle.feed_initial_balance
+    """Rebuild cumulative in_total from daily IoT feed-in only (excludes opening balance)."""
+    running = 0
     for fs_row in FeedSacks.objects.filter(cycle=cycle).order_by("date", "pk"):
         running += fs_row.in_today
         if fs_row.in_total != running:
@@ -16,17 +16,56 @@ def recompute_feed_sack_in_totals(cycle: Cycle) -> None:
             fs_row.save(update_fields=["in_total", "updated_at"])
 
 
-def ensure_opening_feed_sack_snapshot(cycle: Cycle, balance_date: date) -> FeedSacks | None:
-    """Seed a zero-activity snapshot when opening balance is saved before any IoT sync."""
-    if FeedSacks.objects.filter(cycle=cycle).exists():
-        return None
-    return FeedSacks.objects.create(
+def remove_opening_balance_feed_row(
+    cycle: Cycle,
+    *,
+    balance_date: date | None,
+    balance_amount: int,
+) -> None:
+    """Drop a FeedSacks row that only existed to carry opening balance."""
+    if balance_date is None or balance_amount <= 0:
+        return
+    FeedSacks.objects.filter(
         cycle=cycle,
         date=balance_date,
-        in_today=0,
+        in_today=balance_amount,
         out_today=0,
-        in_total=cycle.feed_initial_balance,
-        out_total=0,
         feed_use_today=0,
+        out_total=0,
         feed_use_total=0,
-    )
+    ).delete()
+
+
+def cleanup_opening_balance_feed_rows(
+    cycle: Cycle,
+    *,
+    previous_date: date | None,
+    previous_balance: int,
+    balance_date: date,
+    balance_amount: int,
+) -> None:
+    """Remove opening-balance snapshot rows for the previous and current save."""
+    for row_date, amount in (
+        (previous_date, previous_balance),
+        (balance_date, balance_amount),
+    ):
+        remove_opening_balance_feed_row(
+            cycle,
+            balance_date=row_date,
+            balance_amount=amount,
+        )
+
+    # Legacy cleanup: drop opening-only rows left from earlier saves on other dates.
+    opening_amounts = {
+        amount for amount in (previous_balance, balance_amount) if amount > 0
+    }
+    if not opening_amounts:
+        return
+    FeedSacks.objects.filter(
+        cycle=cycle,
+        in_today__in=opening_amounts,
+        out_today=0,
+        feed_use_today=0,
+        out_total=0,
+        feed_use_total=0,
+    ).delete()