feat: CRUD-API Konten/Buchungen/Kategorien/Regeln

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

finance/app/services/categorize.py

@@ -0,0 +1,20 @@
+from sqlalchemy import select
+from sqlalchemy.orm import Session
+
+from app.models.tables import CategoryRule, Transaction
+
+
+def apply_rules(session: Session, transactions: list[Transaction]) -> int:
+    rules = session.execute(
+        select(CategoryRule).order_by(CategoryRule.priority)).scalars().all()
+    hits = 0
+    for tx in transactions:
+        if tx.category_id is not None:
+            continue
+        haystack = f"{tx.purpose} {tx.counterparty}".lower()
+        for rule in rules:
+            if rule.pattern.lower() in haystack:
+                tx.category_id = rule.category_id
+                hits += 1
+                break
+    return hits