Add Other Purchases to budget page

- New other_purchases table (date, total, notes)
- /api/other CRUD endpoints
- Budget stats now include other costs in cost/egg and cost/dozen math
- Budget page: new Log Other Purchases form, stat cards for other costs,
  combined Purchase History table showing feed and other entries together

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/routers/stats.py

@@ -6,7 +6,7 @@ from sqlalchemy import select, func
 from sqlalchemy.orm import Session
 
 from database import get_db
-from models import EggCollection, FlockHistory, FeedPurchase
+from models import EggCollection, FlockHistory, FeedPurchase, OtherPurchase
 from schemas import DashboardStats, BudgetStats, MonthlySummary
 
 router = APIRouter(prefix="/api/stats", tags=["stats"])
@@ -65,6 +65,15 @@ def _total_feed_cost(db: Session, start: date | None = None, end: date | None =
     return db.scalar(q)
 
 
+def _total_other_cost(db: Session, start: date | None = None, end: date | None = None):
+    q = select(func.coalesce(func.sum(OtherPurchase.total), 0))
+    if start:
+        q = q.where(OtherPurchase.date >= start)
+    if end:
+        q = q.where(OtherPurchase.date <= end)
+    return db.scalar(q)
+
+
 @router.get("/dashboard", response_model=DashboardStats)
 def dashboard_stats(db: Session = Depends(get_db)):
     today      = date.today()
@@ -132,6 +141,18 @@ def monthly_stats(db: Session = Depends(get_db)):
 
     feed_map = {(r.year, r.month): r.feed_cost for r in feed_rows}
 
+    # Monthly other costs
+    other_rows = db.execute(
+        select(
+            func.year(OtherPurchase.date).label('year'),
+            func.month(OtherPurchase.date).label('month'),
+            func.sum(OtherPurchase.total).label('other_cost'),
+        )
+        .group_by(func.year(OtherPurchase.date), func.month(OtherPurchase.date))
+    ).all()
+
+    other_map = {(r.year, r.month): r.other_cost for r in other_rows}
+
     results = []
     for row in egg_rows:
         y, m = int(row.year), int(row.month)
@@ -152,9 +173,13 @@ def monthly_stats(db: Session = Depends(get_db)):
         avg_per_day = round(total_eggs / days_logged, 2) if days_logged else None
         avg_per_hen = round(avg_per_day / flock, 3) if (avg_per_day and flock) else None
 
-        raw_feed_cost = feed_map.get((y, m))
-        feed_cost = round(Decimal(str(raw_feed_cost)), 2) if raw_feed_cost else None
-        cpe = round(Decimal(str(raw_feed_cost)) / Decimal(total_eggs), 4) if (raw_feed_cost and total_eggs) else None
+        raw_feed_cost  = feed_map.get((y, m))
+        raw_other_cost = other_map.get((y, m))
+        feed_cost  = round(Decimal(str(raw_feed_cost)),  2) if raw_feed_cost  else None
+        other_cost = round(Decimal(str(raw_other_cost)), 2) if raw_other_cost else None
+
+        raw_total_cost = (raw_feed_cost or 0) + (raw_other_cost or 0)
+        cpe = round(Decimal(str(raw_total_cost)) / Decimal(total_eggs), 4) if (raw_total_cost and total_eggs) else None
         cpd = round(cpe * 12, 4) if cpe else None
 
         results.append(MonthlySummary(
@@ -167,6 +192,7 @@ def monthly_stats(db: Session = Depends(get_db)):
             flock_at_month_end=flock,
             avg_eggs_per_hen_per_day=avg_per_hen,
             feed_cost=feed_cost,
+            other_cost=other_cost,
             cost_per_egg=cpe,
             cost_per_dozen=cpd,
         ))
@@ -179,10 +205,12 @@ def budget_stats(db: Session = Depends(get_db)):
     today     = date.today()
     start_30d = today - timedelta(days=30)
 
-    total_cost     = _total_feed_cost(db)
-    total_cost_30d = _total_feed_cost(db, start=start_30d)
-    total_eggs     = _total_eggs(db)
-    total_eggs_30d = _total_eggs(db, start=start_30d)
+    total_feed_cost      = _total_feed_cost(db)
+    total_feed_cost_30d  = _total_feed_cost(db, start=start_30d)
+    total_other_cost     = _total_other_cost(db)
+    total_other_cost_30d = _total_other_cost(db, start=start_30d)
+    total_eggs           = _total_eggs(db)
+    total_eggs_30d       = _total_eggs(db, start=start_30d)
 
     def cost_per_egg(cost, eggs):
         if not eggs or not cost:
@@ -192,12 +220,17 @@ def budget_stats(db: Session = Depends(get_db)):
     def cost_per_dozen(cpe):
         return round(cpe * 12, 4) if cpe else None
 
-    cpe      = cost_per_egg(total_cost, total_eggs)
-    cpe_30d  = cost_per_egg(total_cost_30d, total_eggs_30d)
+    combined_cost     = total_feed_cost + total_other_cost
+    combined_cost_30d = total_feed_cost_30d + total_other_cost_30d
+
+    cpe     = cost_per_egg(combined_cost, total_eggs)
+    cpe_30d = cost_per_egg(combined_cost_30d, total_eggs_30d)
 
     return BudgetStats(
-        total_feed_cost=round(Decimal(str(total_cost)), 2) if total_cost else None,
-        total_feed_cost_30d=round(Decimal(str(total_cost_30d)), 2) if total_cost_30d else None,
+        total_feed_cost=round(Decimal(str(total_feed_cost)), 2) if total_feed_cost else None,
+        total_feed_cost_30d=round(Decimal(str(total_feed_cost_30d)), 2) if total_feed_cost_30d else None,
+        total_other_cost=round(Decimal(str(total_other_cost)), 2) if total_other_cost else None,
+        total_other_cost_30d=round(Decimal(str(total_other_cost_30d)), 2) if total_other_cost_30d else None,
         total_eggs_alltime=total_eggs,
         total_eggs_30d=total_eggs_30d,
         cost_per_egg=cpe,