fix: merge

backend/app/services/matching_service.py

@@ -15,7 +15,7 @@ from app.models.transaction import TransactionRecord
 from app.models.transaction_cluster import TransactionCluster
 from app.repositories.transaction_repo import TransactionRepository
 from app.rules.dedup_rules import is_duplicate_pair
-from app.rules.transit_rules import is_self_transfer, is_fee_tolerant_transit_pair
+from app.rules.transit_rules import mark_transit_transactions
 
 
 async def run_matching(case_id: UUID, self_accounts: list[str], db: AsyncSession) -> None:
@@ -34,8 +34,6 @@ async def run_matching(case_id: UUID, self_accounts: list[str], db: AsyncSession
 
     # ── Layer 1 & 2: dedup ──
     matched: set[UUID] = set()
-    clusters: list[TransactionCluster] = []
-
     for i, tx_a in enumerate(transactions):
         if tx_a.id in matched:
             continue
@@ -61,23 +59,9 @@ async def run_matching(case_id: UUID, self_accounts: list[str], db: AsyncSession
                 tx.cluster_id = cluster.id
                 if tx.id != primary.id:
                     tx.is_duplicate = True
-            clusters.append(cluster)
 
     # ── Layer 3: transit detection ──
-    for tx in transactions:
-        if tx.is_duplicate:
-            continue
-        if is_self_transfer(tx, self_accounts):
-            tx.is_transit = True
-
-    # Rule extension: if an in/out pair occurs within 2 minutes and
-    # amount difference is within 2% (e.g. fee), mark both as transit.
-    non_duplicate = [tx for tx in transactions if not tx.is_duplicate]
-    for i, tx_a in enumerate(non_duplicate):
-        for tx_b in non_duplicate[i + 1 :]:
-            if is_fee_tolerant_transit_pair(tx_a, tx_b):
-                tx_a.is_transit = True
-                tx_b.is_transit = True
+    mark_transit_transactions(transactions, self_accounts)
 
     await db.flush()