feat: manual full-pass sync Langflow -> files -> DB+LFX with admin guide

CHANGELOG.md

@@ -5,6 +5,13 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
+### Added
+- Flow-Sync ist jetzt ein manueller Full-Pass: `POST /api/flows/sync`
+  (Button "Aus Langflow synchronisieren" in der Verwaltung) holt erst alle
+  Flows aus Langflow nach `backend/flows/*.json` und deployed sie danach
+  automatisch (Report mit `pulled`-Liste). Der Hintergrund-Beobachter und der
+  Startup-Sync bleiben dateibasiert. Die Verwaltung zeigt eine deutsche
+  Schritt-Anleitung direkt beim Sync-Button.
 ### Fixed
 - LFX runtime user gets a home directory (`useradd -m`, `HOME` set):
   without one every flow run failed with "Settings service not found".

README.md

@@ -122,9 +122,12 @@ Frontend (node lives in the `frontend` container):
 - `docker compose exec frontend npm run build` — typecheck + build.
 - Without a docker socket: VS Code "Attach to Running Container" → frontend.
 
-Flow workflow: design in Langflow → export into `backend/flows/<name>.json`
-(`--pull`, or UI download) → commit → the watcher deploys it automatically.
-Deleting a file removes the flow including its runs (git keeps the JSON).
+Flow workflow: design in Langflow → press "Aus Langflow synchronisieren"
+in Verwaltung (manual full pass: Langflow → `backend/flows/<name>.json` →
+DB + LFX deploy) → commit. File-only alternatives: `scripts/sync_flows.py
+--pull --sync`, UI download, or the single-flow import by Langflow ID. The
+watcher deploys file edits automatically. Deleting a file removes the flow
+including its runs (git keeps the JSON).
 
 ## Production (self-hosted — TLS/reverse proxy required, not included)
 

backend/app/flows/api.py

@@ -29,7 +29,7 @@ from app.settings import settings
 
 from . import input_schema as form_schema
 from . import runner, store
-from .deploy import import_from_langflow
+from .deploy import import_from_langflow, pull_all_from_langflow
 from .langflow_client import (
     LangflowClient,
     LangflowError,
@@ -160,13 +160,25 @@ def list_flows(session: Annotated[Session, Depends(get_db)]):
 async def sync_flows(
     session: Annotated[Session, Depends(get_db)],
     lfx: Annotated[LfxClient, Depends(get_lfx)],
+    langflow: Annotated[LangflowClient, Depends(get_langflow)],
     _admin: Annotated[User, Depends(require_admin)],
 ):
-    """Reconcile backend/flows/*.json into the DB + LFX (add/update/delete)."""
+    """Manual full pass: Langflow -> backend/flows/*.json -> DB + LFX."""
     try:
-        return await sync_from_directory(session, lfx, Path(settings.flows_dir))
+        pulled_result = await pull_all_from_langflow(langflow, Path(settings.flows_dir))
+    except LangflowUnavailable as exc:
+        logger.warning("langflow unavailable: %s", exc)
+        raise HTTPException(status_code=503, detail="authoring server unavailable") from exc
+    except LangflowError as exc:
+        logger.warning("langflow error: %s", exc)
+        raise HTTPException(status_code=502, detail="authoring server error") from exc
+    try:
+        report = await sync_from_directory(session, lfx, Path(settings.flows_dir))
     except FileNotFoundError as exc:
         raise HTTPException(status_code=500, detail=str(exc)) from exc
+    report.pulled = pulled_result["pulled"]
+    report.errors = {**pulled_result["errors"], **report.errors}
+    return report
 
 
 @flows_router.get("/{flow_id}", response_model=FlowDefinitionRead)

backend/app/flows/deploy.py

@@ -2,16 +2,60 @@
 
 from __future__ import annotations
 
+from pathlib import Path
+
 from sqlmodel import Session
 
 from app.models import FlowDefinition, FlowVersion
 from app.settings import settings
 
 from . import export, sync
-from .langflow_client import LangflowClient
+from .langflow_client import LangflowClient, LangflowError
 from .lfx_client import LfxClient
 
 
+def normalize_exported_flow(exported: dict, langflow_flow_id: str, name: str | None = None) -> dict:
+    """Reduce a Langflow FlowRead to the canonical fields we persist."""
+    flow_name = name or exported.get("name") or f"langflow-{langflow_flow_id}"
+    return {
+        "id": exported.get("id", langflow_flow_id),
+        "name": flow_name,
+        "description": exported.get("description") or "",
+        "endpoint_name": exported.get("endpoint_name"),
+        "data": exported.get("data", {}),
+        "tags": exported.get("tags", []),
+        "webhook": exported.get("webhook", False),
+        "is_component": exported.get("is_component", False),
+    }
+
+
+async def pull_all_from_langflow(
+    langflow: LangflowClient, flows_dir: str | Path
+) -> dict[str, list[str] | dict[str, str]]:
+    """Export every Langflow flow to its canonical file.
+
+    Returns {"pulled": [...stems], "errors": {langflow_id: reason}}.
+    Per-flow failures are collected, never raised; listing failures raise
+    (caller maps them to 503/502).
+    """
+    flows_dir = Path(flows_dir)
+    headers = await langflow.list_flows()
+    pulled: list[str] = []
+    errors: dict[str, str] = {}
+    for header in headers:
+        flow_id = str(header.get("id", ""))
+        if not flow_id:
+            continue
+        try:
+            exported = await langflow.export_flow(flow_id)
+            doc = normalize_exported_flow(exported, flow_id)
+            path = export.write_flow_file(flows_dir, doc, name=doc["name"])
+            pulled.append(path.stem)
+        except (LangflowError, OSError, ValueError) as exc:
+            errors[flow_id] = str(exc)
+    return {"pulled": sorted(pulled), "errors": errors}
+
+
 async def import_from_langflow(
     session: Session,
     langflow: LangflowClient,
@@ -28,18 +72,8 @@ async def import_from_langflow(
     truth; sync_document() derives the definition + version from it.
     """
     exported = await langflow.export_flow(langflow_flow_id)
-    flow_name = name or exported.get("name") or f"langflow-{langflow_flow_id}"
-    langflow_json = {
-        "id": exported.get("id", langflow_flow_id),
-        "name": flow_name,
-        "description": exported.get("description") or "",
-        "endpoint_name": exported.get("endpoint_name"),
-        "data": exported.get("data", {}),
-        "tags": exported.get("tags", []),
-        "webhook": exported.get("webhook", False),
-        "is_component": exported.get("is_component", False),
-    }
-    path = export.write_flow_file(settings.flows_dir, langflow_json, name=flow_name)
+    langflow_json = normalize_exported_flow(exported, langflow_flow_id, name=name)
+    path = export.write_flow_file(settings.flows_dir, langflow_json, name=langflow_json["name"])
     definition, version, _action = await sync.sync_document(
         session,
         lfx,

backend/app/flows/schemas.py

@@ -127,13 +127,15 @@ class DecisionRead(BaseModel):
 
 
 class SyncReport(BaseModel):
-    """Result of reconciling backend/flows/*.json into DB + LFX.
+    """Result of the manual full pass: Langflow -> files -> DB + LFX.
 
-    Lists hold filename stems; errors maps filename to reason.
+    Lists hold filename stems; errors maps filename (or Langflow id on
+    pull failures) to reason.
     """
 
     added: list[str] = Field(default_factory=list)
     updated: list[str] = Field(default_factory=list)
     deleted: list[str] = Field(default_factory=list)
     skipped: list[str] = Field(default_factory=list)
+    pulled: list[str] = Field(default_factory=list)
     errors: dict[str, str] = Field(default_factory=dict)

backend/scripts/sync_flows.py

@@ -18,8 +18,9 @@ from pathlib import Path
 from sqlmodel import Session
 
 from app.db import get_engine, reset_engine
-from app.flows import export, sync
-from app.flows.langflow_client import LangflowClient, LangflowError
+from app.flows import sync
+from app.flows.deploy import pull_all_from_langflow
+from app.flows.langflow_client import LangflowClient
 from app.flows.lfx_client import LfxClient
 from app.flows.schemas import SyncReport
 from app.settings import settings
@@ -28,19 +29,7 @@ from app.settings import settings
 async def pull_from_langflow(flows_dir: Path) -> dict:
     """Export every Langflow flow to its own canonical file. Returns a report."""
     client = LangflowClient(settings.langflow_url, api_key=settings.langflow_api_key)
-    headers = await client.list_flows()
-    pulled: list[str] = []
-    errors: dict[str, str] = {}
-    for header in headers:
-        flow_id = str(header.get("id", ""))
-        try:
-            doc = await client.export_flow(flow_id)
-            name = doc.get("name") or flow_id
-            path = export.write_flow_file(flows_dir, doc, name=name)
-            pulled.append(path.stem)
-        except (LangflowError, OSError, ValueError) as exc:
-            errors[flow_id] = str(exc)
-    return {"pulled": sorted(pulled), "errors": errors}
+    return await pull_all_from_langflow(client, flows_dir)
 
 
 async def run_sync(flows_dir: Path) -> SyncReport:

backend/tests/conftest.py

@@ -218,22 +218,36 @@ def override_langflow():
 
     Usage: override_langflow(export_doc) -- the fake export_flow() returns the
     doc, or raises LangflowNotFound/Unavailable for status=404/0.
+    Pass flows=[...] + docs={id: doc} for multi-flow pull tests, or
+    list_status=0/500 to fail the listing. Default list is empty so
+    file-only sync tests stay hermetic.
     """
     from app.flows.api import get_langflow
-    from app.flows.langflow_client import LangflowNotFound, LangflowUnavailable
+    from app.flows.langflow_client import LangflowError, LangflowNotFound, LangflowUnavailable
     from app.main import app
 
-    def _override(export_doc=None, status=200):
+    def _override(export_doc=None, status=200, flows=None, docs=None, list_status=200):
+        if flows is None:
+            flows = [{"id": "fake-1", "name": "fake"}] if export_doc is not None else []
+
         class FakeLangflow:
             async def export_flow(self, flow_id):
                 if status == 404:
                     raise LangflowNotFound(f"flow {flow_id} not found")
                 if status == 0:
                     raise LangflowUnavailable("Langflow unreachable")
+                if docs is not None:
+                    if flow_id in docs:
+                        return docs[flow_id]
+                    raise LangflowNotFound(f"flow {flow_id} not found")
                 return export_doc
 
             async def list_flows(self):
-                return [{"id": "fake-1", "name": "fake"}]
+                if list_status == 0:
+                    raise LangflowUnavailable("Langflow unreachable")
+                if list_status == 500:
+                    raise LangflowError("Langflow error 500")
+                return flows
 
         app.dependency_overrides[get_langflow] = lambda: FakeLangflow()
 

backend/tests/test_sync.py

@@ -118,20 +118,102 @@ async def test_sync_rename_updates_definition_name(session, lfx_server, tmp_path
     assert definition.name == "umbenannt"
 
 
-async def test_sync_endpoint_returns_report(client, lfx_server, tmp_path, monkeypatch, login):
+async def test_sync_endpoint_returns_report(
+    client, lfx_server, tmp_path, monkeypatch, login, override_langflow
+):
     await login()
+    override_langflow()  # empty Langflow: file-only pass
     monkeypatch.setattr(settings, "flows_dir", str(tmp_path))
     _seed_dir(tmp_path)
     response = await client.post("/api/flows/sync")
     assert response.status_code == 200, response.text
     body = response.json()
     assert body["added"] == ["simple_rule"]
+    assert body["pulled"] == []
     assert body["errors"] == {}
 
     response = await client.post("/api/flows/sync")
     assert response.json()["skipped"] == ["simple_rule"]
 
 
+def _langflow_doc(name: str, langflow_id: str) -> dict:
+    doc = load_fixture("simple_rule.json")
+    return {
+        "id": langflow_id,
+        "name": name,
+        "description": "aus Langflow",
+        "endpoint_name": None,
+        "data": doc["data"],
+        "tags": [],
+        "webhook": False,
+        "is_component": False,
+    }
+
+
+async def test_sync_endpoint_pulls_from_langflow_then_syncs(
+    client, lfx_server, tmp_path, monkeypatch, login, override_langflow
+):
+    await login()
+    monkeypatch.setattr(settings, "flows_dir", str(tmp_path))
+    langflow_id = "22222222-3333-4444-8555-666666666666"
+    override_langflow(
+        flows=[{"id": langflow_id, "name": "Gehaltserhöhung"}],
+        docs={langflow_id: _langflow_doc("Gehaltserhöhung", langflow_id)},
+    )
+    response = await client.post("/api/flows/sync")
+    assert response.status_code == 200, response.text
+    body = response.json()
+    assert body["pulled"] == ["gehaltserh-hung"]
+    assert body["added"] == ["gehaltserh-hung"]
+    assert body["errors"] == {}
+    assert (tmp_path / "gehaltserh-hung.json").is_file()
+
+    # Second pass: same content pulls again but syncs nothing new.
+    response = await client.post("/api/flows/sync")
+    assert response.status_code == 200, response.text
+    body = response.json()
+    assert body["pulled"] == ["gehaltserh-hung"]
+    assert body["skipped"] == ["gehaltserh-hung"]
+
+
+async def test_sync_endpoint_pull_error_continues(
+    client, lfx_server, tmp_path, monkeypatch, login, override_langflow
+):
+    await login()
+    monkeypatch.setattr(settings, "flows_dir", str(tmp_path))
+    good_id = "33333333-4444-4555-8666-777777777777"
+    override_langflow(
+        flows=[{"id": good_id, "name": "Gut"}, {"id": "kaputt-id", "name": "Kaputt"}],
+        docs={good_id: _langflow_doc("Gut", good_id)},
+    )
+    response = await client.post("/api/flows/sync")
+    assert response.status_code == 200, response.text
+    body = response.json()
+    assert body["pulled"] == ["gut"]
+    assert body["added"] == ["gut"]
+    assert "kaputt-id" in body["errors"]
+
+
+async def test_sync_endpoint_langflow_unreachable(
+    client, lfx_server, tmp_path, monkeypatch, login, override_langflow
+):
+    await login()
+    monkeypatch.setattr(settings, "flows_dir", str(tmp_path))
+    override_langflow(flows=[], list_status=0)
+    response = await client.post("/api/flows/sync")
+    assert response.status_code == 503
+
+
+async def test_sync_endpoint_langflow_error(
+    client, lfx_server, tmp_path, monkeypatch, login, override_langflow
+):
+    await login()
+    monkeypatch.setattr(settings, "flows_dir", str(tmp_path))
+    override_langflow(flows=[], list_status=500)
+    response = await client.post("/api/flows/sync")
+    assert response.status_code == 502
+
+
 async def test_watch_forever_triggers_on_file_change(tmp_path):
     import contextlib
 

frontend/src/api.ts

@@ -66,6 +66,7 @@ export interface SyncReport {
   updated: string[];
   deleted: string[];
   skipped: string[];
+  pulled: string[];
   errors: Record<string, string>;
 }
 

frontend/src/components/AdminTab.tsx

@@ -24,6 +24,7 @@ import {
   type FlowDefinition,
   type FlowVersion,
 } from "../api";
+import FlowHelp from "./FlowHelp";
 import StatusBadge from "./StatusBadge";
 
 export default function AdminTab() {
@@ -89,6 +90,7 @@ export default function AdminTab() {
     try {
       const r = await api.syncFlows();
       const parts = [
+        `Langflow: ${r.pulled.length}`,
         `+${r.added.length}`,
         `~${r.updated.length}`,
         `-${r.deleted.length}`,
@@ -147,6 +149,7 @@ export default function AdminTab() {
           </Button>
         </Group>
       </Card>
+      <FlowHelp />
       <Card withBorder padding="md" mb="md">
         <Group>
           <Button
@@ -154,9 +157,13 @@ export default function AdminTab() {
             leftSection={<IconRefresh size={16} />}
             onClick={() => void onSync()}
           >
-            Aus backend/flows synchronisieren
+            Aus Langflow synchronisieren
           </Button>
         </Group>
+        <Text size="sm" c="dimmed" mt="xs">
+          Holt alle Flows aus Langflow nach backend/flows und deployed sie
+          danach automatisch.
+        </Text>
       </Card>
       {flows.length === 0 ? (
         <Text c="dimmed">Keine Flows vorhanden.</Text>

frontend/src/components/FlowHelp.tsx

@@ -0,0 +1,92 @@
+import { useState } from "react";
+import {
+  Anchor,
+  Button,
+  Card,
+  List,
+  Text,
+  Title,
+} from "@mantine/core";
+import { IconChevronDown, IconChevronUp, IconExternalLink } from "@tabler/icons-react";
+import { LANGFLOW_URL } from "../api";
+
+export default function FlowHelp() {
+  const [open, setOpen] = useState(false);
+
+  return (
+    <Card withBorder padding="md" mb="md">
+      <Button
+        variant="subtle"
+        leftSection={open ? <IconChevronUp size={16} /> : <IconChevronDown size={16} />}
+        onClick={() => setOpen((v) => !v)}
+      >
+        {open ? "Anleitung verbergen" : "Anleitung: Neuer Flow in Langflow"}
+      </Button>
+      {open && (
+      <div>
+        <Title order={4} mt="sm" mb="xs">
+          So kommt ein neuer Flow in die Webapp
+        </Title>
+        <List size="sm" spacing="xs">
+          <List.Item>
+            <Text component="span" fw={600}>
+              1. In Langflow entwerfen und speichern:{" "}
+            </Text>
+            <Anchor href={LANGFLOW_URL} target="_blank" rel="noreferrer">
+              Langflow öffnen <IconExternalLink size={14} />
+            </Anchor>
+            . Die bestehenden Flows sind dort bereits geladen. Name vergeben, speichern.
+          </List.Item>
+          <List.Item>
+            <Text component="span" fw={600}>
+              2. Sync-Button unten klicken:{" "}
+            </Text>
+            holt alle Flows aus Langflow nach{" "}
+            <Text component="span" ff="monospace">
+              backend/flows/*.json
+            </Text>{" "}
+            und deployed sie danach automatisch (neue Version nur bei geändertem Inhalt,
+            sonst übersprungen).
+          </List.Item>
+          <List.Item>
+            <Text component="span" fw={600}>
+              3. Prüfen:{" "}
+            </Text>
+            Tabelle unten zeigt Version, Autor und Status. Danach erscheint der Flow
+            automatisch auf der Seite Workflows mit seinem Formular. Flows ohne
+            Formular-Knoten zeigen ein Freitext-Feld.
+          </List.Item>
+        </List>
+        <Title order={5} mt="md" mb="xs">
+          Regeln
+        </Title>
+        <List size="sm" spacing="xs">
+          <List.Item>
+            Der Dateiname wird aus dem Flow-Namen erzeugt (Kleinbuchstaben,
+            Bindestriche). Umbenennen erzeugt eine neue Datei.
+          </List.Item>
+          <List.Item>
+            Eine gelöschte Datei löscht den Flow inklusive seiner Läufe
+            (Datei bleibt in Git erhalten).
+          </List.Item>
+          <List.Item>
+            Fehler stehen in der Sync-Meldung (z. B. ungültiges Flow-JSON).
+            Der automatische Beobachter im Hintergrund syncet nur Dateien,
+            Langflow holt nur dieser Button.
+          </List.Item>
+        </List>
+        <Title order={5} mt="md" mb="xs">
+          Formular-Felder
+        </Title>
+        <Text size="sm">
+          Für ein Web-Formular braucht der Flow einen CustomInputForm-Knoten: jeder
+          Eintrag dort ist ein Formularfeld (Name = Feld-Key, Anzeigename = Label).
+          Die Verbindung ChatInput nach form_values bitte behalten — darüber kommen
+          die ausgefüllten Werte an. Unbekannte Feldtypen fallen automatisch auf ein
+          Textfeld zurück.
+        </Text>
+      </div>
+      )}
+    </Card>
+  );
+}