first commit

backend/apps/operations/services/feed_sacks.py

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+from __future__ import annotations
+
+from datetime import date
+
+from apps.farms.models import Cycle
+from apps.operations.models import FeedSacks
+
+
+def recompute_feed_sack_in_totals(cycle: Cycle) -> None:
+    """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:
+            fs_row.in_total = running
+            fs_row.save(update_fields=["in_total", "updated_at"])
+
+
+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=balance_amount,
+        out_today=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()