feat(prices): fiyat kayıtları, birim fiyat motoru ve analizde aylık maliyet

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/models/audit-log.ts

@@ -44,6 +44,7 @@ export const AUDIT_ACTIONS = [
   "store.unarchive",
   "product.archive",
   "product.unarchive",
+  "price.delete",
 ] as const;
 export type AuditAction = (typeof AUDIT_ACTIONS)[number];
 

src/models/product-price.ts

@@ -0,0 +1,38 @@
+import { model, models, Schema, type InferSchemaType, type Model } from "mongoose";
+
+/**
+ * Ürün fiyat kaydı (Bölüm 6.11): ürün × mağaza × tarih × paket fiyatı (kuruş). Kampanya işareti
+ * ve geçerlilik sonu; kaynak `manual` | `receipt` | `provider:<ad>`. Hane bazlı. Birim fiyat
+ * okuma sırasında ürünün dönüşümüyle hesaplanır (saklanmaz).
+ */
+const productPriceSchema = new Schema(
+  {
+    householdId: { type: Schema.Types.ObjectId, required: true },
+    productId: { type: Schema.Types.ObjectId, required: true },
+    storeId: { type: Schema.Types.ObjectId, required: true },
+    /** "YYYY-MM-DD" (İstanbul). */
+    date: { type: String, required: true },
+    priceMinor: { type: Number, required: true, min: 1 },
+    isPromo: { type: Boolean, default: false },
+    promoUntil: { type: String, default: null },
+    source: { type: String, required: true, match: /^(manual|receipt|provider:[a-z0-9-]{1,40})$/ },
+    note: { type: String, default: "", maxlength: 300 },
+    deletedAt: { type: Date, default: null },
+    seedRef: { type: String, default: null },
+    createdBy: { type: Schema.Types.ObjectId, required: true },
+  },
+  { timestamps: true, collection: "productPrices" },
+);
+
+productPriceSchema.index({ householdId: 1, productId: 1, deletedAt: 1, date: 1, createdAt: 1 });
+productPriceSchema.index({ householdId: 1, storeId: 1, date: -1 });
+productPriceSchema.index(
+  { householdId: 1, seedRef: 1 },
+  { unique: true, partialFilterExpression: { seedRef: { $type: "string" } } },
+);
+
+export type ProductPrice = InferSchemaType<typeof productPriceSchema>;
+
+export const ProductPriceModel: Model<ProductPrice> =
+  (models.ProductPrice as Model<ProductPrice> | undefined) ??
+  model<ProductPrice>("ProductPrice", productPriceSchema);