Update matching logic: AI scores all candidates, lower threshold, absolute amount, prompt improvements

models.py

@@ -0,0 +1,29 @@
+from dataclasses import dataclass
+from datetime import datetime
+from typing import Optional
+
+@dataclass
+class Receipt:
+    id: str
+    file_name: str
+    upload_date: datetime
+    receipt_date: datetime
+    amount: float
+    tax: float
+    vendor: str
+    category: str
+    
+@dataclass
+class Transaction:
+    id: str
+    transaction_date: datetime
+    amount: float
+    vendor: str
+    notes: str
+    
+@dataclass
+class Match:
+    receipt: Receipt
+    transaction: Transaction
+    confidence_score: float
+    match_reason: str