feat: Import-Rollback fuer bestaetigte Auszuege (v0.3.0)

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

finance/tests/test_import_api.py

@@ -142,6 +142,67 @@ def test_delete_error_import_returns_204(client, db):
     assert client.delete(f"/api/imports/{sid}", headers=H).status_code == 204
 
 
+def test_rollback_confirmed_import_deletes_transactions_and_statement(client, fake_parse, tmp_path, monkeypatch):
+    # Ein bestaetigter Import laesst sich als Ganzes zurueckrollen: alle seine
+    # Buchungen UND der Auszug selbst verschwinden, das Konto bleibt bestehen
+    # (Name/IBAN fuer einen Re-Import mit verbessertem Parser).
+    monkeypatch.setenv("FB_INBOX_DIR", str(tmp_path / "inbox"))
+    monkeypatch.setenv("FB_UPLOADS_DIR", str(tmp_path / "uploads"))
+    from app.config import get_settings
+    get_settings.cache_clear()
+    sid = _upload(client).json()["id"]
+    assert client.post(f"/api/imports/{sid}/confirm", headers=H).status_code == 200
+    account_id = client.get("/api/accounts", headers=H).json()[0]["id"]
+
+    r = client.post(f"/api/imports/{sid}/rollback", headers=H)
+    assert r.status_code == 200
+    body = r.json()
+    assert body == {"deleted_transactions": 1, "statement_id": sid}
+
+    txs = client.get("/api/transactions", headers=H).json()
+    assert len(txs) == 0
+    imports = client.get("/api/imports", headers=H).json()
+    assert all(s["id"] != sid for s in imports)
+    accounts = client.get("/api/accounts", headers=H).json()
+    assert any(a["id"] == account_id for a in accounts)
+
+
+def test_rollback_then_reimport_restores_transactions(client, fake_parse, tmp_path, monkeypatch):
+    # Der eigentliche Zweck des Rollbacks: denselben Auszug erneut importieren
+    # koennen (z.B. nach einem verbesserten Parser), ohne dass alte Buchungen
+    # als Duplikate im Weg stehen.
+    monkeypatch.setenv("FB_INBOX_DIR", str(tmp_path / "inbox"))
+    monkeypatch.setenv("FB_UPLOADS_DIR", str(tmp_path / "uploads"))
+    from app.config import get_settings
+    get_settings.cache_clear()
+    sid = _upload(client).json()["id"]
+    client.post(f"/api/imports/{sid}/confirm", headers=H)
+    client.post(f"/api/imports/{sid}/rollback", headers=H)
+
+    sid2 = _upload(client, "auszug_reimport.pdf").json()["id"]
+    prev = client.get(f"/api/imports/{sid2}/preview", headers=H).json()
+    assert prev["balance_ok"] is True
+    assert prev["duplicates"] == 0
+    assert client.post(f"/api/imports/{sid2}/confirm", headers=H).status_code == 200
+    txs = client.get("/api/transactions", headers=H).json()
+    assert len(txs) == 1 and txs[0]["status"] == "confirmed"
+
+
+def test_rollback_draft_import_returns_409(client, fake_parse, tmp_path, monkeypatch):
+    monkeypatch.setenv("FB_INBOX_DIR", str(tmp_path / "inbox"))
+    monkeypatch.setenv("FB_UPLOADS_DIR", str(tmp_path / "uploads"))
+    from app.config import get_settings
+    get_settings.cache_clear()
+    sid = _upload(client).json()["id"]
+    r = client.post(f"/api/imports/{sid}/rollback", headers=H)
+    assert r.status_code == 409
+
+
+def test_rollback_unknown_import_returns_404(client):
+    r = client.post("/api/imports/999999/rollback", headers=H)
+    assert r.status_code == 404
+
+
 def test_upload_corrupt_pdf_produces_error_statement_not_500(client, tmp_path, monkeypatch):
     # Datei besteht die Endungspruefung (.pdf), ist aber strukturell kein
     # gueltiges PDF -> pdfplumber wirft eine eigene Exception (keine