first commit

app/models.py

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+from __future__ import annotations
+
+from dataclasses import dataclass
+
+
+@dataclass(frozen=True)
+class Offer:
+    source: str
+    external_id: str
+    title: str
+    description: str
+    price: str
+    price_amount: int | None
+    url: str
+    category_id: int
+    published_at: str
+    seller_username: str | None = None
+
+    @property
+    def dedup_key(self) -> str:
+        return f"{self.source}:{self.external_id}"