feat: add dag_engine app — CLI + web frontend for DAG execution (0007e)

Full DAG engine app with CLI subcommands (run, list, status, validate, server) and React/Mantine web frontend. Uses net/http + embedded Vite build. SQLite store for run history. Scheduler with cron_ticker for automated execution. Compatible with existing dagu YAML format. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
2026-04-12 13:05:36 +02:00
parent 7aa7790931
commit d9414e4cba
29 changed files with 2682 additions and 0 deletions
@@ -0,0 +1,5 @@
+dag-engine
+dag_engine
+dag_engine.db
+frontend/node_modules/
+frontend/dist/
@@ -0,0 +1,47 @@
+package main
+
+import (
+	"io/fs"
+	"net/http"
+)
+
+// RegisterAPI sets up all HTTP routes on the given mux.
+func RegisterAPI(mux *http.ServeMux, executor *Executor, scheduler *Scheduler, frontendFS fs.FS) {
+	// API routes.
+	mux.HandleFunc("GET /api/dags", handleListDags(executor))
+	mux.HandleFunc("GET /api/dags/{name}", handleGetDag(executor))
+	mux.HandleFunc("POST /api/dags/{name}/run", handleRunDag(executor))
+
+	mux.HandleFunc("GET /api/runs", handleListRuns(executor))
+	mux.HandleFunc("GET /api/runs/{id}", handleGetRun(executor))
+
+	mux.HandleFunc("POST /api/scheduler/start", handleSchedulerStart(scheduler))
+	mux.HandleFunc("POST /api/scheduler/stop", handleSchedulerStop(scheduler))
+	mux.HandleFunc("GET /api/scheduler/status", handleSchedulerStatus(scheduler))
+
+	// Frontend SPA fallback.
+	if frontendFS != nil {
+		mux.Handle("/", spaHandler(frontendFS))
+	}
+}
+
+// spaHandler serves static files from the embedded FS, falling back to index.html
+// for unknown paths (SPA client-side routing).
+func spaHandler(fsys fs.FS) http.Handler {
+	fileServer := http.FileServer(http.FS(fsys))
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		// Try to serve the file directly.
+		path := r.URL.Path
+		if path == "/" {
+			path = "index.html"
+		} else {
+			path = path[1:] // strip leading /
+		}
+
+		if _, err := fs.Stat(fsys, path); err != nil {
+			// File not found — serve index.html for SPA routing.
+			r.URL.Path = "/"
+		}
+		fileServer.ServeHTTP(w, r)
+	})
+}
@@ -0,0 +1,86 @@
+---
+name: dag_engine
+lang: go
+domain: infra
+description: "Motor de ejecucion de DAGs con CLI y interfaz web. Reemplaza Dagu con implementacion propia compatible con el formato YAML existente. Almacena historial de ejecuciones en SQLite."
+tags: [service, dag, workflow, scheduler, web, cron]
+uses_functions:
+  - dag_parse_go_core
+  - dag_validate_go_core
+  - dag_topo_sort_go_core
+  - dag_resolve_env_go_core
+  - parse_cron_expr_go_core
+  - next_cron_time_go_core
+  - cron_ticker_go_infra
+  - cron_match_go_core
+  - process_spawn_go_infra
+  - process_wait_go_infra
+  - process_kill_go_infra
+uses_types:
+  - dag_definition_go_core
+  - dag_step_go_core
+  - dag_validation_result_go_core
+  - cron_schedule_go_core
+  - process_handle_go_infra
+  - process_result_go_infra
+  - DagRun_go_infra
+  - DagStepResult_go_infra
+framework: "net/http + vite + react"
+entry_point: "main.go"
+dir_path: "apps/dag_engine"
+---
+
+## Arquitectura
+
+CLI + servidor web en un unico binario:
+
+```
+dag-engine run <path.yaml>      # ejecuta un DAG desde terminal
+dag-engine list [dir]            # lista DAGs con schedule y estado
+dag-engine status [dag_name]     # historial de ejecuciones
+dag-engine validate <path.yaml>  # valida sin ejecutar
+dag-engine server                # arranca HTTP + frontend web
+```
+
+### Backend (Go)
+
+- `net/http` con `ServeMux` (Go 1.22+ pattern routing)
+- SQLite via `go-sqlite3` para historial de runs
+- Executor: parse -> validate -> topo_sort -> spawn/wait por nivel -> store
+- Scheduler: cron_ticker por cada DAG con schedule
+
+### Frontend (Vite + React + Mantine)
+
+- DagList: tabla de DAGs con schedule, tags, ultimo status
+- DagDetail: metadata + "Run Now" + historial
+- RunDetail: timeline de steps con stdout/stderr expandible
+
+### Storage
+
+SQLite `dag_engine.db`:
+- `dag_runs`: id, dag_name, status, trigger, started_at, finished_at, error
+- `dag_step_results`: id, run_id, step_name, status, exit_code, stdout, stderr, duration_ms
+
+### Build
+
+```bash
+cd frontend && pnpm install && pnpm build
+cd .. && CGO_ENABLED=1 go build -tags fts5 -o dag-engine .
+```
+
+### Uso
+
+```bash
+# CLI
+./dag-engine run ~/dagu/dags/example.yaml
+./dag-engine list ~/dagu/dags/
+
+# Servidor web
+./dag-engine server --port 8090 --dags-dir ~/dagu/dags/ --scheduler
+# Browser: http://localhost:8090
+```
+
+## Notas
+
+Compatible con el formato YAML de Dagu. Lee DAGs existentes de `~/dagu/dags/` sin modificaciones.
+Puerto por defecto 8090 (mismo que Dagu).
@@ -0,0 +1,34 @@
+package main
+
+import (
+	"flag"
+	"os"
+	"path/filepath"
+)
+
+// Config holds the runtime configuration for the DAG engine.
+type Config struct {
+	Port          int
+	DagsDir       string
+	DBPath        string
+	AutoScheduler bool
+}
+
+// DefaultConfig returns sensible defaults.
+func DefaultConfig() Config {
+	home, _ := os.UserHomeDir()
+	return Config{
+		Port:    8090,
+		DagsDir: filepath.Join(home, "dagu", "dags"),
+		DBPath:  "dag_engine.db",
+	}
+}
+
+// ParseFlags populates config from CLI flags for the "server" subcommand.
+func (c *Config) ParseFlags(fs *flag.FlagSet, args []string) error {
+	fs.IntVar(&c.Port, "port", c.Port, "HTTP server port")
+	fs.StringVar(&c.DagsDir, "dags-dir", c.DagsDir, "directory containing DAG YAML files")
+	fs.StringVar(&c.DBPath, "db", c.DBPath, "path to SQLite database")
+	fs.BoolVar(&c.AutoScheduler, "scheduler", c.AutoScheduler, "auto-start cron scheduler")
+	return fs.Parse(args)
+}
@@ -0,0 +1,482 @@
+package main
+
+import (
+	"context"
+	"fmt"
+	"log"
+	"os"
+	"path/filepath"
+	"strings"
+	"sync"
+	"time"
+
+	"fn-registry/functions/core"
+	"fn-registry/functions/infra"
+
+	"dag-engine/store"
+)
+
+// Executor orchestrates DAG parsing, validation, and execution.
+type Executor struct {
+	store   *store.DB
+	dagsDir string
+}
+
+// NewExecutor creates a new executor.
+func NewExecutor(s *store.DB, dagsDir string) *Executor {
+	return &Executor{store: s, dagsDir: dagsDir}
+}
+
+// ExecuteDAG runs a DAG from a YAML file path and returns the run ID.
+// It runs asynchronously: steps execute in topological order with parallel levels.
+func (e *Executor) ExecuteDAG(ctx context.Context, dagPath string, trigger string) (string, error) {
+	data, err := os.ReadFile(dagPath)
+	if err != nil {
+		return "", fmt.Errorf("read dag: %w", err)
+	}
+
+	dag, err := core.DagParse(data)
+	if err != nil {
+		return "", fmt.Errorf("parse dag: %w", err)
+	}
+	dag.FilePath = dagPath
+
+	// Resolve env variables.
+	dag = core.DagResolveEnv(dag, os.Environ())
+
+	// Validate.
+	result := core.DagValidate(dag)
+	if !result.Valid {
+		return "", fmt.Errorf("validate dag: %s", strings.Join(result.Errors, "; "))
+	}
+
+	// Create run record.
+	runID := generateID()
+	now := time.Now()
+	run := &store.DagRun{
+		ID:        runID,
+		DagName:   dag.Name,
+		DagPath:   dagPath,
+		Status:    "running",
+		Trigger:   trigger,
+		StartedAt: now,
+	}
+	if err := e.store.CreateRun(run); err != nil {
+		return "", fmt.Errorf("create run: %w", err)
+	}
+
+	// Topological sort.
+	levels, err := core.DagTopoSort(dag.Steps)
+	if err != nil {
+		e.failRun(runID, err)
+		return runID, err
+	}
+
+	// Setup DAGU_ENV temp file for inter-step communication.
+	daguEnvFile, err := os.CreateTemp("", "dagu_env_*")
+	if err != nil {
+		e.failRun(runID, err)
+		return runID, err
+	}
+	daguEnvPath := daguEnvFile.Name()
+	daguEnvFile.Close()
+	defer os.Remove(daguEnvPath)
+
+	// Track step outputs for ${step_id.stdout} references.
+	stepOutputs := make(map[string]string)
+
+	// Execute levels.
+	runFailed := false
+	var runErr error
+
+	for _, level := range levels {
+		if runFailed {
+			// Skip remaining levels, mark steps as skipped.
+			for _, step := range level {
+				e.recordStepSkipped(runID, step)
+			}
+			continue
+		}
+
+		var wg sync.WaitGroup
+		var mu sync.Mutex
+		levelFailed := false
+
+		for _, step := range level {
+			step := step
+			wg.Add(1)
+			go func() {
+				defer wg.Done()
+
+				mu.Lock()
+				if levelFailed {
+					mu.Unlock()
+					e.recordStepSkipped(runID, step)
+					return
+				}
+				mu.Unlock()
+
+				err := e.executeStep(ctx, runID, dag, step, daguEnvPath, stepOutputs, &mu)
+				if err != nil && !step.ContinueOn.Failure {
+					mu.Lock()
+					levelFailed = true
+					runFailed = true
+					runErr = fmt.Errorf("step %q failed: %w", stepName(step), err)
+					mu.Unlock()
+				}
+			}()
+		}
+		wg.Wait()
+	}
+
+	// Run handlers.
+	if runFailed {
+		e.runHandlers(ctx, runID, dag, dag.HandlerOn.Failure, daguEnvPath, stepOutputs)
+	} else {
+		e.runHandlers(ctx, runID, dag, dag.HandlerOn.Success, daguEnvPath, stepOutputs)
+	}
+	e.runHandlers(ctx, runID, dag, dag.HandlerOn.Exit, daguEnvPath, stepOutputs)
+
+	// Finalize run.
+	fin := time.Now()
+	status := "success"
+	errMsg := ""
+	if runFailed {
+		status = "failed"
+		if runErr != nil {
+			errMsg = runErr.Error()
+		}
+	}
+	e.store.UpdateRunStatus(runID, status, &fin, errMsg)
+
+	return runID, runErr
+}
+
+// executeStep runs a single step, recording results in the store.
+func (e *Executor) executeStep(ctx context.Context, runID string, dag core.DagDefinition, step core.DagStep, daguEnvPath string, outputs map[string]string, mu *sync.Mutex) error {
+	stepID := generateID()
+	now := time.Now()
+	e.store.InsertStepResult(&store.DagStepResult{
+		ID:        stepID,
+		RunID:     runID,
+		StepName:  stepName(step),
+		Status:    "running",
+		StartedAt: &now,
+	})
+
+	// Build environment.
+	env := buildStepEnv(dag, step, daguEnvPath, outputs)
+
+	// Determine command.
+	command := step.Command
+	if command == "" && step.Script != "" {
+		command = step.Script
+	}
+	if command == "" {
+		e.store.UpdateStepResult(stepID, "skipped", 0, "", "", nil, 0, "no command or script")
+		return nil
+	}
+
+	// Resolve step-level ${VAR} references and ${step_id.stdout} patterns.
+	mu.Lock()
+	command = resolveStepRefs(command, outputs)
+	mu.Unlock()
+
+	// Determine working directory.
+	dir := step.Dir
+	if dir == "" {
+		dir = dag.WorkingDir
+	}
+
+	shell := step.Shell
+	if shell == "" {
+		shell = dag.Shell
+	}
+
+	// Spawn process.
+	handle, err := infra.ProcessSpawn(command, dir, env, shell)
+	if err != nil {
+		fin := time.Now()
+		e.store.UpdateStepResult(stepID, "failed", -1, "", "", &fin, time.Since(now).Milliseconds(), err.Error())
+		return err
+	}
+
+	// Wait for process.
+	result, err := infra.ProcessWait(handle, step.TimeoutSec)
+	fin := time.Now()
+	duration := time.Since(now).Milliseconds()
+
+	if err != nil && result.ExitCode == 0 {
+		result.ExitCode = -1
+	}
+
+	status := "success"
+	errMsg := ""
+	if result.ExitCode != 0 || err != nil {
+		status = "failed"
+		if err != nil {
+			errMsg = err.Error()
+		}
+	}
+
+	e.store.UpdateStepResult(stepID, status, result.ExitCode, result.Stdout, result.Stderr, &fin, duration, errMsg)
+
+	// Store output for ${step_id.stdout} references.
+	if step.ID != "" || step.Output != "" {
+		mu.Lock()
+		key := step.ID
+		if key == "" {
+			key = step.Output
+		}
+		outputs[key] = strings.TrimSpace(result.Stdout)
+		mu.Unlock()
+	}
+
+	// Read DAGU_ENV for inter-step env propagation.
+	readDaguEnv(daguEnvPath, outputs)
+
+	if status == "failed" {
+		return fmt.Errorf("exit code %d", result.ExitCode)
+	}
+	return nil
+}
+
+func (e *Executor) runHandlers(ctx context.Context, runID string, dag core.DagDefinition, handlers []core.DagStep, daguEnvPath string, outputs map[string]string) {
+	var mu sync.Mutex
+	for _, step := range handlers {
+		e.executeStep(ctx, runID, dag, step, daguEnvPath, outputs, &mu)
+	}
+}
+
+func (e *Executor) failRun(runID string, err error) {
+	fin := time.Now()
+	e.store.UpdateRunStatus(runID, "failed", &fin, err.Error())
+}
+
+func (e *Executor) recordStepSkipped(runID string, step core.DagStep) {
+	now := time.Now()
+	e.store.InsertStepResult(&store.DagStepResult{
+		ID:       generateID(),
+		RunID:    runID,
+		StepName: stepName(step),
+		Status:   "skipped",
+		StartedAt: &now,
+	})
+}
+
+// --- helpers ---
+
+func stepName(s core.DagStep) string {
+	if s.Name != "" {
+		return s.Name
+	}
+	return s.ID
+}
+
+func buildStepEnv(dag core.DagDefinition, step core.DagStep, daguEnvPath string, outputs map[string]string) []string {
+	env := os.Environ()
+
+	// Add DAG-level env.
+	for k, v := range dag.Env {
+		env = append(env, k+"="+v)
+	}
+
+	// Add step-level env.
+	for k, v := range step.Env {
+		env = append(env, k+"="+v)
+	}
+
+	// Add DAGU_ENV path.
+	env = append(env, "DAGU_ENV="+daguEnvPath)
+
+	return env
+}
+
+func resolveStepRefs(command string, outputs map[string]string) string {
+	for k, v := range outputs {
+		command = strings.ReplaceAll(command, "${"+k+".stdout}", v)
+		command = strings.ReplaceAll(command, "$"+k+".stdout", v)
+	}
+	return command
+}
+
+func readDaguEnv(path string, outputs map[string]string) {
+	data, err := os.ReadFile(path)
+	if err != nil || len(data) == 0 {
+		return
+	}
+	for _, line := range strings.Split(string(data), "\n") {
+		line = strings.TrimSpace(line)
+		if line == "" || strings.HasPrefix(line, "#") {
+			continue
+		}
+		parts := strings.SplitN(line, "=", 2)
+		if len(parts) == 2 {
+			outputs[parts[0]] = parts[1]
+		}
+	}
+}
+
+// generateID creates a simple time-based unique ID.
+func generateID() string {
+	return fmt.Sprintf("%d-%04x", time.Now().UnixNano(), time.Now().Nanosecond()%0xFFFF)
+}
+
+// --- DAG listing helpers ---
+
+// DagInfo summarizes a DAG file for listing.
+type DagInfo struct {
+	Name        string   `json:"name"`
+	Description string   `json:"description,omitempty"`
+	Schedule    []string `json:"schedule,omitempty"`
+	Tags        []string `json:"tags,omitempty"`
+	Type        string   `json:"type,omitempty"`
+	FilePath    string   `json:"file_path"`
+	Valid       bool     `json:"valid"`
+	LastRun     *store.DagRun `json:"last_run,omitempty"`
+}
+
+// ListDAGs scans a directory for YAML files and returns parsed DAG info.
+func (e *Executor) ListDAGs() ([]DagInfo, error) {
+	entries, err := os.ReadDir(e.dagsDir)
+	if err != nil {
+		return nil, fmt.Errorf("read dags dir: %w", err)
+	}
+
+	var dags []DagInfo
+	for _, entry := range entries {
+		if entry.IsDir() {
+			continue
+		}
+		ext := filepath.Ext(entry.Name())
+		if ext != ".yaml" && ext != ".yml" {
+			continue
+		}
+
+		path := filepath.Join(e.dagsDir, entry.Name())
+		data, err := os.ReadFile(path)
+		if err != nil {
+			continue
+		}
+
+		dag, err := core.DagParse(data)
+		if err != nil {
+			dags = append(dags, DagInfo{
+				Name:     strings.TrimSuffix(entry.Name(), ext),
+				FilePath: path,
+				Valid:    false,
+			})
+			continue
+		}
+
+		info := DagInfo{
+			Name:        dag.Name,
+			Description: dag.Description,
+			Schedule:    dag.Schedule,
+			Tags:        dag.Tags,
+			Type:        dag.Type,
+			FilePath:    path,
+			Valid:       true,
+		}
+
+		// Attach last run info.
+		runs, _, _ := e.store.ListRuns(dag.Name, 1, 0)
+		if len(runs) > 0 {
+			info.LastRun = &runs[0]
+		}
+
+		dags = append(dags, info)
+	}
+
+	return dags, nil
+}
+
+// GetDAG returns detailed info for a specific DAG by name.
+func (e *Executor) GetDAG(name string) (*DagInfo, *core.DagDefinition, *core.DagValidationResult, error) {
+	// Find the YAML file.
+	entries, err := os.ReadDir(e.dagsDir)
+	if err != nil {
+		return nil, nil, nil, err
+	}
+
+	for _, entry := range entries {
+		ext := filepath.Ext(entry.Name())
+		base := strings.TrimSuffix(entry.Name(), ext)
+		if (ext != ".yaml" && ext != ".yml") || base != name {
+			continue
+		}
+
+		path := filepath.Join(e.dagsDir, entry.Name())
+		data, err := os.ReadFile(path)
+		if err != nil {
+			return nil, nil, nil, err
+		}
+
+		dag, err := core.DagParse(data)
+		if err != nil {
+			return nil, nil, nil, fmt.Errorf("parse: %w", err)
+		}
+		dag.FilePath = path
+
+		validationResult := core.DagValidate(dag)
+
+		info := &DagInfo{
+			Name:        dag.Name,
+			Description: dag.Description,
+			Schedule:    dag.Schedule,
+			Tags:        dag.Tags,
+			Type:        dag.Type,
+			FilePath:    path,
+			Valid:       validationResult.Valid,
+		}
+
+		runs, _, _ := e.store.ListRuns(dag.Name, 1, 0)
+		if len(runs) > 0 {
+			info.LastRun = &runs[0]
+		}
+
+		return info, &dag, &validationResult, nil
+	}
+
+	return nil, nil, nil, fmt.Errorf("dag %q not found in %s", name, e.dagsDir)
+}
+
+// ValidateDAG parses and validates a DAG file, printing results.
+func ValidateDAG(path string) error {
+	data, err := os.ReadFile(path)
+	if err != nil {
+		return err
+	}
+
+	dag, err := core.DagParse(data)
+	if err != nil {
+		return fmt.Errorf("parse error: %w", err)
+	}
+
+	result := core.DagValidate(dag)
+
+	log.Printf("DAG: %s", dag.Name)
+	log.Printf("Steps: %d", len(dag.Steps))
+	log.Printf("Schedule: %v", dag.Schedule)
+
+	if result.Valid {
+		log.Printf("Validation: PASS")
+		log.Printf("Topological levels: %d", len(result.Levels))
+		for i, level := range result.Levels {
+			log.Printf("  Level %d: %v", i, level)
+		}
+	} else {
+		log.Printf("Validation: FAIL")
+		for _, e := range result.Errors {
+			log.Printf("  ERROR: %s", e)
+		}
+	}
+	for _, w := range result.Warnings {
+		log.Printf("  WARNING: %s", w)
+	}
+
+	if !result.Valid {
+		return fmt.Errorf("validation failed")
+	}
+	return nil
+}
@@ -0,0 +1,12 @@
+<!DOCTYPE html>
+<html lang="en">
+  <head>
+    <meta charset="UTF-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <title>DAG Engine</title>
+  </head>
+  <body>
+    <div id="root"></div>
+    <script type="module" src="/src/main.tsx"></script>
+  </body>
+</html>
@@ -0,0 +1,28 @@
+{
+  "name": "dag-engine-frontend",
+  "private": true,
+  "version": "1.0.0",
+  "type": "module",
+  "scripts": {
+    "dev": "vite",
+    "build": "tsc -b && vite build",
+    "preview": "vite preview"
+  },
+  "dependencies": {
+    "@mantine/core": "^9.0.2",
+    "@mantine/hooks": "^9.0.2",
+    "@tabler/icons-react": "^3.31.0",
+    "react": "^19.1.0",
+    "react-dom": "^19.1.0",
+    "react-router-dom": "^7.6.1"
+  },
+  "devDependencies": {
+    "@types/react": "^19.1.6",
+    "@types/react-dom": "^19.1.6",
+    "@vitejs/plugin-react": "^4.5.2",
+    "postcss": "^8.5.4",
+    "postcss-preset-mantine": "^1.17.0",
+    "typescript": "~5.8.3",
+    "vite": "^6.3.5"
+  }
+}
@@ -0,0 +1,5 @@
+module.exports = {
+  plugins: {
+    "postcss-preset-mantine": {},
+  },
+};
@@ -0,0 +1,32 @@
+import { Routes, Route } from "react-router-dom";
+import { AppShell, Container, Title, Group, Text } from "@mantine/core";
+import { IconTopologyRing } from "@tabler/icons-react";
+import { DagList } from "./pages/DagList";
+import { DagDetail } from "./pages/DagDetail";
+import { RunDetail } from "./pages/RunDetail";
+
+export function App() {
+  return (
+    <AppShell header={{ height: 50 }} padding="md">
+      <AppShell.Header>
+        <Group h="100%" px="md">
+          <IconTopologyRing size={24} />
+          <Title order={4}>DAG Engine</Title>
+          <Text size="xs" c="dimmed">
+            fn_registry workflow executor
+          </Text>
+        </Group>
+      </AppShell.Header>
+
+      <AppShell.Main>
+        <Container size="lg">
+          <Routes>
+            <Route path="/" element={<DagList />} />
+            <Route path="/dags/:name" element={<DagDetail />} />
+            <Route path="/runs/:id" element={<RunDetail />} />
+          </Routes>
+        </Container>
+      </AppShell.Main>
+    </AppShell>
+  );
+}
@@ -0,0 +1,63 @@
+import type {
+  DagSummary,
+  DagDetail,
+  DagRun,
+  RunDetail,
+  SchedulerStatus,
+} from "./types";
+
+const BASE = "/api";
+
+async function fetchJSON<T>(path: string, init?: RequestInit): Promise<T> {
+  const res = await fetch(`${BASE}${path}`, init);
+  if (!res.ok) {
+    const err = await res.json().catch(() => ({ error: res.statusText }));
+    throw new Error(err.error || res.statusText);
+  }
+  return res.json();
+}
+
+export function listDags(): Promise<DagSummary[]> {
+  return fetchJSON("/dags");
+}
+
+export function getDag(name: string): Promise<DagDetail> {
+  return fetchJSON(`/dags/${encodeURIComponent(name)}`);
+}
+
+export function triggerDag(
+  name: string
+): Promise<{ status: string; dag: string; message: string }> {
+  return fetchJSON(`/dags/${encodeURIComponent(name)}/run`, {
+    method: "POST",
+  });
+}
+
+export function listRuns(params?: {
+  dag?: string;
+  limit?: number;
+  offset?: number;
+}): Promise<{ runs: DagRun[]; total: number }> {
+  const search = new URLSearchParams();
+  if (params?.dag) search.set("dag", params.dag);
+  if (params?.limit) search.set("limit", String(params.limit));
+  if (params?.offset) search.set("offset", String(params.offset));
+  const qs = search.toString();
+  return fetchJSON(`/runs${qs ? "?" + qs : ""}`);
+}
+
+export function getRun(id: string): Promise<RunDetail> {
+  return fetchJSON(`/runs/${encodeURIComponent(id)}`);
+}
+
+export function startScheduler(): Promise<void> {
+  return fetchJSON("/scheduler/start", { method: "POST" });
+}
+
+export function stopScheduler(): Promise<void> {
+  return fetchJSON("/scheduler/stop", { method: "POST" });
+}
+
+export function getSchedulerStatus(): Promise<SchedulerStatus> {
+  return fetchJSON("/scheduler/status");
+}
@@ -0,0 +1,18 @@
+import { Badge } from "@mantine/core";
+
+const colorMap: Record<string, string> = {
+  success: "green",
+  failed: "red",
+  running: "blue",
+  pending: "gray",
+  cancelled: "yellow",
+  skipped: "dimmed",
+};
+
+export function StatusBadge({ status }: { status: string }) {
+  return (
+    <Badge color={colorMap[status] || "gray"} variant="light" size="sm">
+      {status}
+    </Badge>
+  );
+}
@@ -0,0 +1,85 @@
+import { Timeline, Text, Code, Collapse, Box, Group } from "@mantine/core";
+import {
+  IconCircleCheck,
+  IconCircleX,
+  IconLoader,
+  IconCircleMinus,
+  IconClock,
+} from "@tabler/icons-react";
+import { useDisclosure } from "@mantine/hooks";
+import type { DagStepResult } from "../types";
+
+const iconMap: Record<string, React.ReactNode> = {
+  success: <IconCircleCheck size={16} color="var(--mantine-color-green-6)" />,
+  failed: <IconCircleX size={16} color="var(--mantine-color-red-6)" />,
+  running: <IconLoader size={16} color="var(--mantine-color-blue-6)" />,
+  skipped: <IconCircleMinus size={16} color="var(--mantine-color-dimmed)" />,
+  pending: <IconClock size={16} color="var(--mantine-color-gray-6)" />,
+};
+
+function StepItem({ step }: { step: DagStepResult }) {
+  const [opened, { toggle }] = useDisclosure(step.Status === "failed");
+  const hasOutput = step.Stdout || step.Stderr;
+
+  return (
+    <Timeline.Item
+      bullet={iconMap[step.Status] || iconMap.pending}
+      title={
+        <Group gap="xs">
+          <Text
+            size="sm"
+            fw={500}
+            onClick={hasOutput ? toggle : undefined}
+            style={hasOutput ? { cursor: "pointer" } : undefined}
+          >
+            {step.StepName}
+          </Text>
+          <Text size="xs" c="dimmed">
+            {step.DurationMs}ms
+          </Text>
+          {step.ExitCode !== 0 && step.ExitCode !== -1 && (
+            <Text size="xs" c="red">
+              exit {step.ExitCode}
+            </Text>
+          )}
+        </Group>
+      }
+    >
+      {hasOutput && (
+        <Collapse in={opened}>
+          <Box mt="xs">
+            {step.Stdout && (
+              <Code block mb="xs" style={{ maxHeight: 200, overflow: "auto" }}>
+                {step.Stdout}
+              </Code>
+            )}
+            {step.Stderr && (
+              <Code
+                block
+                color="red"
+                style={{ maxHeight: 200, overflow: "auto" }}
+              >
+                {step.Stderr}
+              </Code>
+            )}
+          </Box>
+        </Collapse>
+      )}
+    </Timeline.Item>
+  );
+}
+
+export function StepTimeline({ steps }: { steps: DagStepResult[] }) {
+  const activeIndex = steps.findIndex((s) => s.Status === "running");
+
+  return (
+    <Timeline
+      active={activeIndex >= 0 ? activeIndex : steps.length - 1}
+      bulletSize={24}
+    >
+      {steps.map((step) => (
+        <StepItem key={step.ID} step={step} />
+      ))}
+    </Timeline>
+  );
+}
@@ -0,0 +1,18 @@
+import "@mantine/core/styles.css";
+import { MantineProvider, createTheme } from "@mantine/core";
+import { createRoot } from "react-dom/client";
+import { BrowserRouter } from "react-router-dom";
+import { App } from "./App";
+
+const theme = createTheme({
+  primaryColor: "blue",
+  fontFamily: "system-ui, -apple-system, sans-serif",
+});
+
+createRoot(document.getElementById("root")!).render(
+  <MantineProvider theme={theme} defaultColorScheme="dark">
+    <BrowserRouter>
+      <App />
+    </BrowserRouter>
+  </MantineProvider>
+);
@@ -0,0 +1,204 @@
+import { useEffect, useState } from "react";
+import { useParams, useNavigate } from "react-router-dom";
+import {
+  Title,
+  Text,
+  Group,
+  Button,
+  Badge,
+  Stack,
+  Paper,
+  Table,
+  Alert,
+  Loader,
+  Code,
+} from "@mantine/core";
+import { IconPlayerPlay, IconArrowLeft } from "@tabler/icons-react";
+import { getDag, triggerDag } from "../api";
+import { StatusBadge } from "../components/StatusBadge";
+import type { DagDetail as DagDetailType } from "../types";
+
+export function DagDetail() {
+  const { name } = useParams<{ name: string }>();
+  const navigate = useNavigate();
+  const [data, setData] = useState<DagDetailType | null>(null);
+  const [loading, setLoading] = useState(true);
+  const [error, setError] = useState<string | null>(null);
+  const [triggering, setTriggering] = useState(false);
+
+  const load = async () => {
+    if (!name) return;
+    setLoading(true);
+    try {
+      setData(await getDag(name));
+      setError(null);
+    } catch (e) {
+      setError((e as Error).message);
+    } finally {
+      setLoading(false);
+    }
+  };
+
+  useEffect(() => {
+    load();
+  }, [name]);
+
+  const handleRun = async () => {
+    if (!name) return;
+    setTriggering(true);
+    try {
+      await triggerDag(name);
+      setTimeout(load, 1000);
+    } catch (e) {
+      setError((e as Error).message);
+    } finally {
+      setTriggering(false);
+    }
+  };
+
+  if (loading) return <Loader />;
+  if (error) return <Alert color="red">{error}</Alert>;
+  if (!data) return <Text>Not found</Text>;
+
+  const { dag, validation, runs } = data;
+
+  return (
+    <Stack gap="md">
+      <Group>
+        <Button
+          variant="subtle"
+          size="xs"
+          leftSection={<IconArrowLeft size={14} />}
+          onClick={() => navigate("/")}
+        >
+          Back
+        </Button>
+      </Group>
+
+      <Group justify="space-between">
+        <div>
+          <Title order={2}>{dag.Name}</Title>
+          {dag.Description && (
+            <Text size="sm" c="dimmed">
+              {dag.Description}
+            </Text>
+          )}
+        </div>
+        <Button
+          leftSection={<IconPlayerPlay size={16} />}
+          onClick={handleRun}
+          loading={triggering}
+        >
+          Run Now
+        </Button>
+      </Group>
+
+      <Group gap="xs">
+        {dag.Schedule?.map((s: string) => (
+          <Badge key={s} variant="light" ff="monospace">
+            {s}
+          </Badge>
+        ))}
+        <Badge variant="light">{dag.Type || "chain"}</Badge>
+        {dag.Tags?.map((t: string) => (
+          <Badge key={t} variant="dot">
+            {t}
+          </Badge>
+        ))}
+      </Group>
+
+      {!validation.Valid && (
+        <Alert color="red" title="Validation errors">
+          {validation.Errors.map((e: string, i: number) => (
+            <Text key={i} size="sm">
+              {e}
+            </Text>
+          ))}
+        </Alert>
+      )}
+
+      <Paper p="md" withBorder>
+        <Title order={4} mb="sm">
+          Steps ({dag.Steps?.length || 0})
+        </Title>
+        {validation.Levels?.map((level: string[], i: number) => (
+          <Group key={i} gap="xs" mb="xs">
+            <Text size="xs" c="dimmed" w={60}>
+              Level {i}:
+            </Text>
+            {level.map((name: string) => {
+              const step = dag.Steps?.find(
+                (s) => s.Name === name || s.ID === name
+              );
+              return (
+                <Badge key={name} variant="outline" size="sm">
+                  {name}
+                  {step?.Depends?.length
+                    ? ` (after ${step.Depends.join(",")})`
+                    : ""}
+                </Badge>
+              );
+            })}
+          </Group>
+        ))}
+
+        {dag.Env && Object.keys(dag.Env).length > 0 && (
+          <>
+            <Title order={5} mt="md" mb="xs">
+              Environment
+            </Title>
+            <Code block>
+              {Object.entries(dag.Env)
+                .map(([k, v]) => `${k}=${v}`)
+                .join("\n")}
+            </Code>
+          </>
+        )}
+      </Paper>
+
+      <Paper p="md" withBorder>
+        <Title order={4} mb="sm">
+          Run History
+        </Title>
+        {runs?.length ? (
+          <Table striped>
+            <Table.Thead>
+              <Table.Tr>
+                <Table.Th>Status</Table.Th>
+                <Table.Th>Trigger</Table.Th>
+                <Table.Th>Started</Table.Th>
+                <Table.Th>Duration</Table.Th>
+              </Table.Tr>
+            </Table.Thead>
+            <Table.Tbody>
+              {runs.map((r) => (
+                <Table.Tr
+                  key={r.ID}
+                  style={{ cursor: "pointer" }}
+                  onClick={() => navigate(`/runs/${r.ID}`)}
+                >
+                  <Table.Td>
+                    <StatusBadge status={r.Status} />
+                  </Table.Td>
+                  <Table.Td>{r.Trigger}</Table.Td>
+                  <Table.Td>
+                    {new Date(r.StartedAt).toLocaleString()}
+                  </Table.Td>
+                  <Table.Td>
+                    {r.FinishedAt
+                      ? `${Math.round((new Date(r.FinishedAt).getTime() - new Date(r.StartedAt).getTime()) / 1000)}s`
+                      : "running..."}
+                  </Table.Td>
+                </Table.Tr>
+              ))}
+            </Table.Tbody>
+          </Table>
+        ) : (
+          <Text size="sm" c="dimmed">
+            No runs yet
+          </Text>
+        )}
+      </Paper>
+    </Stack>
+  );
+}
@@ -0,0 +1,164 @@
+import { useEffect, useState } from "react";
+import { useNavigate } from "react-router-dom";
+import {
+  Table,
+  Title,
+  Group,
+  Button,
+  Badge,
+  Text,
+  Loader,
+  Stack,
+  Alert,
+} from "@mantine/core";
+import {
+  IconPlayerPlay,
+  IconPlayerStop,
+  IconRefresh,
+} from "@tabler/icons-react";
+import { listDags, getSchedulerStatus, startScheduler, stopScheduler } from "../api";
+import { StatusBadge } from "../components/StatusBadge";
+import type { DagSummary, SchedulerStatus } from "../types";
+
+export function DagList() {
+  const [dags, setDags] = useState<DagSummary[]>([]);
+  const [loading, setLoading] = useState(true);
+  const [error, setError] = useState<string | null>(null);
+  const [scheduler, setScheduler] = useState<SchedulerStatus | null>(null);
+  const navigate = useNavigate();
+
+  const load = async () => {
+    setLoading(true);
+    setError(null);
+    try {
+      const [d, s] = await Promise.all([listDags(), getSchedulerStatus()]);
+      setDags(d || []);
+      setScheduler(s);
+    } catch (e) {
+      setError((e as Error).message);
+    } finally {
+      setLoading(false);
+    }
+  };
+
+  useEffect(() => {
+    load();
+    const interval = setInterval(load, 10000);
+    return () => clearInterval(interval);
+  }, []);
+
+  const toggleScheduler = async () => {
+    if (scheduler?.running) {
+      await stopScheduler();
+    } else {
+      await startScheduler();
+    }
+    const s = await getSchedulerStatus();
+    setScheduler(s);
+  };
+
+  return (
+    <Stack gap="md">
+      <Group justify="space-between">
+        <Title order={2}>DAGs</Title>
+        <Group gap="xs">
+          <Button
+            size="xs"
+            variant="light"
+            leftSection={<IconRefresh size={14} />}
+            onClick={load}
+          >
+            Refresh
+          </Button>
+          <Button
+            size="xs"
+            variant={scheduler?.running ? "filled" : "light"}
+            color={scheduler?.running ? "green" : "gray"}
+            leftSection={
+              scheduler?.running ? (
+                <IconPlayerStop size={14} />
+              ) : (
+                <IconPlayerPlay size={14} />
+              )
+            }
+            onClick={toggleScheduler}
+          >
+            Scheduler {scheduler?.running ? "ON" : "OFF"}
+          </Button>
+        </Group>
+      </Group>
+
+      {error && <Alert color="red">{error}</Alert>}
+
+      {loading && !dags.length ? (
+        <Loader />
+      ) : (
+        <Table striped highlightOnHover>
+          <Table.Thead>
+            <Table.Tr>
+              <Table.Th>Name</Table.Th>
+              <Table.Th>Schedule</Table.Th>
+              <Table.Th>Type</Table.Th>
+              <Table.Th>Tags</Table.Th>
+              <Table.Th>Last Status</Table.Th>
+              <Table.Th>Last Run</Table.Th>
+            </Table.Tr>
+          </Table.Thead>
+          <Table.Tbody>
+            {dags.map((d) => (
+              <Table.Tr
+                key={d.file_path}
+                style={{ cursor: "pointer" }}
+                onClick={() => navigate(`/dags/${d.name}`)}
+              >
+                <Table.Td>
+                  <Text fw={500}>{d.name}</Text>
+                  {d.description && (
+                    <Text size="xs" c="dimmed" lineClamp={1}>
+                      {d.description}
+                    </Text>
+                  )}
+                </Table.Td>
+                <Table.Td>
+                  <Text size="xs" ff="monospace">
+                    {d.schedule?.join(", ") || "-"}
+                  </Text>
+                </Table.Td>
+                <Table.Td>
+                  <Badge variant="light" size="xs">
+                    {d.type || "chain"}
+                  </Badge>
+                </Table.Td>
+                <Table.Td>
+                  <Group gap={4}>
+                    {d.tags?.map((t) => (
+                      <Badge key={t} variant="dot" size="xs">
+                        {t}
+                      </Badge>
+                    ))}
+                  </Group>
+                </Table.Td>
+                <Table.Td>
+                  {d.last_run ? (
+                    <StatusBadge status={d.last_run.Status} />
+                  ) : (
+                    <Text size="xs" c="dimmed">
+                      -
+                    </Text>
+                  )}
+                </Table.Td>
+                <Table.Td>
+                  <Text size="xs">
+                    {d.last_run
+                      ? new Date(d.last_run.StartedAt).toLocaleString()
+                      : "-"}
+                  </Text>
+                </Table.Td>
+              </Table.Tr>
+            ))}
+          </Table.Tbody>
+        </Table>
+      )}
+    </Stack>
+  );
+}
@@ -0,0 +1,105 @@
+import { useEffect, useState } from "react";
+import { useParams, useNavigate } from "react-router-dom";
+import {
+  Title,
+  Text,
+  Group,
+  Button,
+  Stack,
+  Paper,
+  Alert,
+  Loader,
+} from "@mantine/core";
+import { IconArrowLeft } from "@tabler/icons-react";
+import { getRun } from "../api";
+import { StatusBadge } from "../components/StatusBadge";
+import { StepTimeline } from "../components/StepTimeline";
+import type { RunDetail as RunDetailType } from "../types";
+
+export function RunDetail() {
+  const { id } = useParams<{ id: string }>();
+  const navigate = useNavigate();
+  const [data, setData] = useState<RunDetailType | null>(null);
+  const [loading, setLoading] = useState(true);
+  const [error, setError] = useState<string | null>(null);
+
+  const load = async () => {
+    if (!id) return;
+    try {
+      setData(await getRun(id));
+      setError(null);
+    } catch (e) {
+      setError((e as Error).message);
+    } finally {
+      setLoading(false);
+    }
+  };
+
+  useEffect(() => {
+    load();
+    // Auto-refresh while running.
+    const interval = setInterval(() => {
+      if (data?.run.Status === "running") {
+        load();
+      }
+    }, 2000);
+    return () => clearInterval(interval);
+  }, [id, data?.run.Status]);
+
+  if (loading) return <Loader />;
+  if (error) return <Alert color="red">{error}</Alert>;
+  if (!data) return <Text>Not found</Text>;
+
+  const { run, steps } = data;
+  const duration = run.FinishedAt
+    ? `${Math.round((new Date(run.FinishedAt).getTime() - new Date(run.StartedAt).getTime()) / 1000)}s`
+    : "running...";
+
+  return (
+    <Stack gap="md">
+      <Group>
+        <Button
+          variant="subtle"
+          size="xs"
+          leftSection={<IconArrowLeft size={14} />}
+          onClick={() => navigate(`/dags/${run.DagName}`)}
+        >
+          Back to {run.DagName}
+        </Button>
+      </Group>
+
+      <Group justify="space-between">
+        <div>
+          <Title order={2}>Run {run.ID.substring(0, 16)}...</Title>
+          <Text size="sm" c="dimmed">
+            {run.DagName} &middot; {run.Trigger} &middot;{" "}
+            {new Date(run.StartedAt).toLocaleString()}
+          </Text>
+        </div>
+        <Group gap="xs">
+          <StatusBadge status={run.Status} />
+          <Text size="sm">{duration}</Text>
+        </Group>
+      </Group>
+
+      {run.Error && (
+        <Alert color="red" title="Error">
+          {run.Error}
+        </Alert>
+      )}
+
+      <Paper p="md" withBorder>
+        <Title order={4} mb="md">
+          Steps ({steps?.length || 0})
+        </Title>
+        {steps?.length ? (
+          <StepTimeline steps={steps} />
+        ) : (
+          <Text size="sm" c="dimmed">
+            No steps recorded
+          </Text>
+        )}
+      </Paper>
+    </Stack>
+  );
+}
@@ -0,0 +1,66 @@
+export interface DagSummary {
+  name: string;
+  description?: string;
+  schedule?: string[];
+  tags?: string[];
+  type?: string;
+  file_path: string;
+  valid: boolean;
+  last_run?: DagRun;
+}
+
+export interface DagRun {
+  ID: string;
+  DagName: string;
+  DagPath: string;
+  Status: string;
+  Trigger: string;
+  StartedAt: string;
+  FinishedAt?: string;
+  Error: string;
+}
+
+export interface DagStepResult {
+  ID: string;
+  RunID: string;
+  StepName: string;
+  Status: string;
+  ExitCode: number;
+  Stdout: string;
+  Stderr: string;
+  StartedAt?: string;
+  FinishedAt?: string;
+  DurationMs: number;
+  Error: string;
+}
+
+export interface DagDetail {
+  info: DagSummary;
+  dag: {
+    Name: string;
+    Description: string;
+    Type: string;
+    Schedule: string[];
+    Steps: { Name: string; ID: string; Command: string; Script: string; Depends: string[] }[];
+    Env: Record<string, string>;
+    Tags: string[];
+    HandlerOn: { Failure: unknown[]; Success: unknown[] };
+  };
+  validation: {
+    Valid: boolean;
+    Errors: string[];
+    Warnings: string[];
+    Levels: string[][];
+  };
+  runs: DagRun[];
+}
+
+export interface RunDetail {
+  run: DagRun;
+  steps: DagStepResult[];
+}
+
+export interface SchedulerStatus {
+  running: boolean;
+  dags: { name: string; path: string; schedule: string; next_run: string }[];
+}
@@ -0,0 +1,21 @@
+{
+  "compilerOptions": {
+    "target": "ES2020",
+    "useDefineForClassFields": true,
+    "lib": ["ES2020", "DOM", "DOM.Iterable"],
+    "module": "ESNext",
+    "skipLibCheck": true,
+    "moduleResolution": "bundler",
+    "allowImportingTsExtensions": true,
+    "isolatedModules": true,
+    "moduleDetection": "force",
+    "noEmit": true,
+    "jsx": "react-jsx",
+    "strict": true,
+    "noUnusedLocals": true,
+    "noUnusedParameters": true,
+    "noFallthroughCasesInSwitch": true,
+    "noUncheckedSideEffectImports": true
+  },
+  "include": ["src"]
+}
@@ -0,0 +1,15 @@
+import { defineConfig } from "vite";
+import react from "@vitejs/plugin-react";
+
+export default defineConfig({
+  plugins: [react()],
+  server: {
+    port: 5175,
+    proxy: {
+      "/api": "http://localhost:8090",
+    },
+  },
+  build: {
+    outDir: "dist",
+  },
+});
@@ -0,0 +1,48 @@
+module dag-engine
+
+go 1.25.0
+
+require (
+	fn-registry v0.0.0-00010101000000-000000000000
+	github.com/mattn/go-sqlite3 v1.14.37
+)
+
+require (
+	github.com/ClickHouse/ch-go v0.71.0 // indirect
+	github.com/ClickHouse/clickhouse-go/v2 v2.44.0 // indirect
+	github.com/andybalholm/brotli v1.2.0 // indirect
+	github.com/apache/arrow-go/v18 v18.1.0 // indirect
+	github.com/cespare/xxhash/v2 v2.3.0 // indirect
+	github.com/go-faster/city v1.0.1 // indirect
+	github.com/go-faster/errors v0.7.1 // indirect
+	github.com/go-viper/mapstructure/v2 v2.2.1 // indirect
+	github.com/goccy/go-json v0.10.5 // indirect
+	github.com/google/flatbuffers v25.1.24+incompatible // indirect
+	github.com/google/uuid v1.6.0 // indirect
+	github.com/jackc/pgpassfile v1.0.0 // indirect
+	github.com/jackc/pgservicefile v0.0.0-20240606120523-5a60cdf6a761 // indirect
+	github.com/jackc/pgx/v5 v5.9.1 // indirect
+	github.com/jackc/puddle/v2 v2.2.2 // indirect
+	github.com/klauspost/compress v1.18.3 // indirect
+	github.com/klauspost/cpuid/v2 v2.2.9 // indirect
+	github.com/marcboeker/go-duckdb v1.8.5 // indirect
+	github.com/paulmach/orb v0.12.0 // indirect
+	github.com/pierrec/lz4/v4 v4.1.25 // indirect
+	github.com/rogpeppe/go-internal v1.14.1 // indirect
+	github.com/segmentio/asm v1.2.1 // indirect
+	github.com/shopspring/decimal v1.4.0 // indirect
+	github.com/zeebo/xxh3 v1.0.2 // indirect
+	go.opentelemetry.io/otel v1.41.0 // indirect
+	go.opentelemetry.io/otel/trace v1.41.0 // indirect
+	go.yaml.in/yaml/v3 v3.0.4 // indirect
+	golang.org/x/exp v0.0.0-20250128182459-e0ece0dbea4c // indirect
+	golang.org/x/mod v0.27.0 // indirect
+	golang.org/x/sync v0.19.0 // indirect
+	golang.org/x/sys v0.41.0 // indirect
+	golang.org/x/text v0.29.0 // indirect
+	golang.org/x/tools v0.36.0 // indirect
+	golang.org/x/xerrors v0.0.0-20240903120638-7835f813f4da // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+)
+
+replace fn-registry => /home/lucas/fn_registry
@@ -0,0 +1,168 @@
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+github.com/ClickHouse/clickhouse-go/v2 v2.44.0/go.mod h1:giJfUVlMkcfUEPVfRpt51zZaGEx9i17gCos8gBl392c=
+github.com/andybalholm/brotli v1.2.0 h1:ukwgCxwYrmACq68yiUqwIWnGY0cTPox/M94sVwToPjQ=
+github.com/andybalholm/brotli v1.2.0/go.mod h1:rzTDkvFWvIrjDXZHkuS16NPggd91W3kUSvPlQ1pLaKY=
+github.com/apache/arrow-go/v18 v18.1.0 h1:agLwJUiVuwXZdwPYVrlITfx7bndULJ/dggbnLFgDp/Y=
+github.com/apache/arrow-go/v18 v18.1.0/go.mod h1:tigU/sIgKNXaesf5d7Y95jBBKS5KsxTqYBKXFsvKzo0=
+github.com/apache/thrift v0.21.0 h1:tdPmh/ptjE1IJnhbhrcl2++TauVjy242rkV/UzJChnE=
+github.com/apache/thrift v0.21.0/go.mod h1:W1H8aR/QRtYNvrPeFXBtobyRkd0/YVhTc6i07XIAgDw=
+github.com/cespare/xxhash/v2 v2.3.0 h1:UL815xU9SqsFlibzuggzjXhog7bL6oX9BbNZnL2UFvs=
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+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
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@@ -0,0 +1,76 @@
+package main
+
+import (
+	"context"
+	"encoding/json"
+	"net/http"
+)
+
+func handleListDags(executor *Executor) http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		dags, err := executor.ListDAGs()
+		if err != nil {
+			writeError(w, http.StatusInternalServerError, err.Error())
+			return
+		}
+		writeJSON(w, http.StatusOK, dags)
+	}
+}
+
+func handleGetDag(executor *Executor) http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		name := r.PathValue("name")
+		info, dag, validation, err := executor.GetDAG(name)
+		if err != nil {
+			writeError(w, http.StatusNotFound, err.Error())
+			return
+		}
+
+		// Get recent runs.
+		runs, _, _ := executor.store.ListRuns(dag.Name, 10, 0)
+
+		resp := map[string]interface{}{
+			"info":       info,
+			"dag":        dag,
+			"validation": validation,
+			"runs":       runs,
+		}
+		writeJSON(w, http.StatusOK, resp)
+	}
+}
+
+func handleRunDag(executor *Executor) http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		name := r.PathValue("name")
+		info, _, _, err := executor.GetDAG(name)
+		if err != nil {
+			writeError(w, http.StatusNotFound, err.Error())
+			return
+		}
+
+		// Execute asynchronously.
+		go func() {
+			ctx := context.Background()
+			executor.ExecuteDAG(ctx, info.FilePath, "api")
+		}()
+
+		// Return run acknowledgment.
+		writeJSON(w, http.StatusAccepted, map[string]string{
+			"status":  "accepted",
+			"dag":     name,
+			"message": "DAG execution started",
+		})
+	}
+}
+
+// --- JSON helpers ---
+
+func writeJSON(w http.ResponseWriter, status int, data interface{}) {
+	w.Header().Set("Content-Type", "application/json")
+	w.WriteHeader(status)
+	json.NewEncoder(w).Encode(data)
+}
+
+func writeError(w http.ResponseWriter, status int, msg string) {
+	writeJSON(w, status, map[string]string{"error": msg})
+}
@@ -0,0 +1,59 @@
+package main
+
+import (
+	"net/http"
+	"strconv"
+)
+
+func handleListRuns(executor *Executor) http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		dagName := r.URL.Query().Get("dag")
+		limit, _ := strconv.Atoi(r.URL.Query().Get("limit"))
+		offset, _ := strconv.Atoi(r.URL.Query().Get("offset"))
+		if limit <= 0 || limit > 100 {
+			limit = 20
+		}
+		if offset < 0 {
+			offset = 0
+		}
+
+		runs, total, err := executor.store.ListRuns(dagName, limit, offset)
+		if err != nil {
+			writeError(w, http.StatusInternalServerError, err.Error())
+			return
+		}
+
+		writeJSON(w, http.StatusOK, map[string]interface{}{
+			"runs":   runs,
+			"total":  total,
+			"limit":  limit,
+			"offset": offset,
+		})
+	}
+}
+
+func handleGetRun(executor *Executor) http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		id := r.PathValue("id")
+		run, err := executor.store.GetRun(id)
+		if err != nil {
+			writeError(w, http.StatusInternalServerError, err.Error())
+			return
+		}
+		if run == nil {
+			writeError(w, http.StatusNotFound, "run not found")
+			return
+		}
+
+		steps, err := executor.store.ListStepResults(id)
+		if err != nil {
+			writeError(w, http.StatusInternalServerError, err.Error())
+			return
+		}
+
+		writeJSON(w, http.StatusOK, map[string]interface{}{
+			"run":   run,
+			"steps": steps,
+		})
+	}
+}
@@ -0,0 +1,27 @@
+package main
+
+import "net/http"
+
+func handleSchedulerStart(scheduler *Scheduler) http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		if err := scheduler.Start(); err != nil {
+			writeError(w, http.StatusConflict, err.Error())
+			return
+		}
+		writeJSON(w, http.StatusOK, map[string]string{"status": "started"})
+	}
+}
+
+func handleSchedulerStop(scheduler *Scheduler) http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		scheduler.Stop()
+		writeJSON(w, http.StatusOK, map[string]string{"status": "stopped"})
+	}
+}
+
+func handleSchedulerStatus(scheduler *Scheduler) http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		status := scheduler.Status()
+		writeJSON(w, http.StatusOK, status)
+	}
+}
@@ -0,0 +1,336 @@
+package main
+
+import (
+	"context"
+	"embed"
+	"flag"
+	"fmt"
+	iofs "io/fs"
+	"log"
+	"net/http"
+	"os"
+	"os/signal"
+	"path/filepath"
+	"strings"
+	"syscall"
+	"text/tabwriter"
+	"time"
+
+	"fn-registry/functions/core"
+
+	"dag-engine/store"
+)
+
+//go:embed all:frontend/dist
+var frontendDist embed.FS
+
+func main() {
+	if len(os.Args) < 2 {
+		printUsage()
+		os.Exit(1)
+	}
+
+	cmd := os.Args[1]
+	args := os.Args[2:]
+
+	switch cmd {
+	case "run":
+		cmdRun(args)
+	case "list":
+		cmdList(args)
+	case "status":
+		cmdStatus(args)
+	case "validate":
+		cmdValidate(args)
+	case "server":
+		cmdServer(args)
+	case "help", "-h", "--help":
+		printUsage()
+	default:
+		fmt.Fprintf(os.Stderr, "unknown command: %s\n", cmd)
+		printUsage()
+		os.Exit(1)
+	}
+}
+
+func printUsage() {
+	fmt.Println(`dag-engine — DAG workflow executor
+
+Usage:
+  dag-engine <command> [options]
+
+Commands:
+  run <path.yaml>         Execute a DAG and show results
+  list [dir]              List DAGs with schedule and last status
+  status [dag_name]       Show execution history
+  validate <path.yaml>    Parse and validate without executing
+  server                  Start HTTP server with web frontend
+
+Server options:
+  --port <port>           HTTP port (default: 8090)
+  --dags-dir <dir>        DAGs directory (default: ~/dagu/dags)
+  --db <path>             SQLite database path (default: dag_engine.db)
+  --scheduler             Auto-start cron scheduler`)
+}
+
+// --- CLI Commands ---
+
+func cmdRun(args []string) {
+	if len(args) < 1 {
+		fmt.Fprintln(os.Stderr, "usage: dag-engine run <path.yaml>")
+		os.Exit(1)
+	}
+
+	dagPath := args[0]
+	cfg := DefaultConfig()
+
+	// Parse optional flags after the path.
+	fs := flag.NewFlagSet("run", flag.ExitOnError)
+	fs.StringVar(&cfg.DBPath, "db", cfg.DBPath, "SQLite database path")
+	fs.Parse(args[1:])
+
+	db, err := store.Open(cfg.DBPath)
+	if err != nil {
+		log.Fatalf("open db: %v", err)
+	}
+	defer db.Close()
+
+	executor := NewExecutor(db, filepath.Dir(dagPath))
+
+	fmt.Printf("Executing %s...\n", dagPath)
+	ctx := context.Background()
+	runID, err := executor.ExecuteDAG(ctx, dagPath, "manual")
+
+	// Print results.
+	if runID != "" {
+		run, _ := db.GetRun(runID)
+		steps, _ := db.ListStepResults(runID)
+
+		if run != nil {
+			fmt.Println()
+			for _, s := range steps {
+				icon := "  "
+				switch s.Status {
+				case "success":
+					icon = "OK"
+				case "failed":
+					icon = "!!"
+				case "skipped":
+					icon = "--"
+				case "running":
+					icon = ".."
+				}
+				fmt.Printf("[%s] %s (%dms)\n", icon, s.StepName, s.DurationMs)
+				if s.Status == "failed" && s.Stderr != "" {
+					for _, line := range strings.Split(strings.TrimSpace(s.Stderr), "\n") {
+						fmt.Printf("     %s\n", line)
+					}
+				}
+			}
+			fmt.Println()
+
+			dur := ""
+			if run.FinishedAt != nil {
+				dur = fmt.Sprintf(" (%s)", run.FinishedAt.Sub(run.StartedAt).Round(time.Millisecond))
+			}
+			fmt.Printf("Run %s: %s%s\n", runID, strings.ToUpper(run.Status), dur)
+		}
+	}
+
+	if err != nil {
+		os.Exit(1)
+	}
+}
+
+func cmdList(args []string) {
+	cfg := DefaultConfig()
+	if len(args) > 0 && !strings.HasPrefix(args[0], "-") {
+		cfg.DagsDir = args[0]
+		args = args[1:]
+	}
+
+	fs := flag.NewFlagSet("list", flag.ExitOnError)
+	fs.StringVar(&cfg.DBPath, "db", cfg.DBPath, "SQLite database path")
+	fs.Parse(args)
+
+	db, err := store.Open(cfg.DBPath)
+	if err != nil {
+		log.Fatalf("open db: %v", err)
+	}
+	defer db.Close()
+
+	executor := NewExecutor(db, cfg.DagsDir)
+	dags, err := executor.ListDAGs()
+	if err != nil {
+		log.Fatalf("list dags: %v", err)
+	}
+
+	w := tabwriter.NewWriter(os.Stdout, 0, 0, 2, ' ', 0)
+	fmt.Fprintln(w, "NAME\tSCHEDULE\tTYPE\tTAGS\tLAST STATUS\tLAST RUN")
+	for _, d := range dags {
+		sched := strings.Join(d.Schedule, ", ")
+		tags := strings.Join(d.Tags, ", ")
+		lastStatus := "-"
+		lastRun := "-"
+		if d.LastRun != nil {
+			lastStatus = d.LastRun.Status
+			lastRun = d.LastRun.StartedAt.Format("2006-01-02 15:04")
+		}
+		typ := d.Type
+		if typ == "" {
+			typ = "chain"
+		}
+		fmt.Fprintf(w, "%s\t%s\t%s\t%s\t%s\t%s\n", d.Name, sched, typ, tags, lastStatus, lastRun)
+	}
+	w.Flush()
+}
+
+func cmdStatus(args []string) {
+	cfg := DefaultConfig()
+
+	fs := flag.NewFlagSet("status", flag.ExitOnError)
+	fs.StringVar(&cfg.DBPath, "db", cfg.DBPath, "SQLite database path")
+	limit := fs.Int("limit", 10, "number of runs to show")
+	fs.Parse(args)
+
+	dagName := ""
+	if fs.NArg() > 0 {
+		dagName = fs.Arg(0)
+	}
+
+	db, err := store.Open(cfg.DBPath)
+	if err != nil {
+		log.Fatalf("open db: %v", err)
+	}
+	defer db.Close()
+
+	runs, total, err := db.ListRuns(dagName, *limit, 0)
+	if err != nil {
+		log.Fatalf("list runs: %v", err)
+	}
+
+	w := tabwriter.NewWriter(os.Stdout, 0, 0, 2, ' ', 0)
+	fmt.Fprintf(w, "Showing %d of %d runs", len(runs), total)
+	if dagName != "" {
+		fmt.Fprintf(w, " for %s", dagName)
+	}
+	fmt.Fprintln(w)
+	fmt.Fprintln(w, "RUN_ID\tDAG\tSTATUS\tTRIGGER\tSTARTED\tDURATION")
+	for _, r := range runs {
+		dur := "-"
+		if r.FinishedAt != nil {
+			dur = r.FinishedAt.Sub(r.StartedAt).Round(time.Millisecond).String()
+		}
+		fmt.Fprintf(w, "%s\t%s\t%s\t%s\t%s\t%s\n",
+			r.ID, r.DagName, r.Status, r.Trigger,
+			r.StartedAt.Format("2006-01-02 15:04:05"), dur)
+	}
+	w.Flush()
+}
+
+func cmdValidate(args []string) {
+	if len(args) < 1 {
+		fmt.Fprintln(os.Stderr, "usage: dag-engine validate <path.yaml>")
+		os.Exit(1)
+	}
+
+	data, err := os.ReadFile(args[0])
+	if err != nil {
+		log.Fatalf("read: %v", err)
+	}
+
+	dag, err := core.DagParse(data)
+	if err != nil {
+		log.Fatalf("parse error: %v", err)
+	}
+
+	result := core.DagValidate(dag)
+
+	fmt.Printf("DAG: %s\n", dag.Name)
+	fmt.Printf("Steps: %d\n", len(dag.Steps))
+	fmt.Printf("Schedule: %v\n", dag.Schedule)
+	fmt.Printf("Type: %s\n", dag.Type)
+
+	if result.Valid {
+		fmt.Println("Validation: PASS")
+		for i, level := range result.Levels {
+			fmt.Printf("  Level %d: %v\n", i, level)
+		}
+	} else {
+		fmt.Println("Validation: FAIL")
+		for _, e := range result.Errors {
+			fmt.Printf("  ERROR: %s\n", e)
+		}
+	}
+	for _, w := range result.Warnings {
+		fmt.Printf("  WARNING: %s\n", w)
+	}
+
+	if !result.Valid {
+		os.Exit(1)
+	}
+}
+
+// --- Server Command ---
+
+func cmdServer(args []string) {
+	cfg := DefaultConfig()
+	fs := flag.NewFlagSet("server", flag.ExitOnError)
+	cfg.ParseFlags(fs, args)
+
+	db, err := store.Open(cfg.DBPath)
+	if err != nil {
+		log.Fatalf("open db: %v", err)
+	}
+	defer db.Close()
+
+	executor := NewExecutor(db, cfg.DagsDir)
+	scheduler := NewScheduler(executor, cfg.DagsDir)
+
+	// Prepare frontend FS.
+	var feFS iofs.FS
+	distFS, err := iofs.Sub(frontendDist, "frontend/dist")
+	if err == nil {
+		// Check if dist has content (built frontend exists).
+		entries, _ := iofs.ReadDir(distFS, ".")
+		if len(entries) > 0 {
+			feFS = distFS
+			log.Printf("serving frontend from embedded dist/")
+		}
+	}
+	if feFS == nil {
+		log.Printf("no frontend build found, API-only mode")
+	}
+
+	mux := http.NewServeMux()
+	RegisterAPI(mux, executor, scheduler, feFS)
+
+	handler := corsMiddleware(loggingMiddleware(mux))
+
+	if cfg.AutoScheduler {
+		if err := scheduler.Start(); err != nil {
+			log.Printf("scheduler start: %v", err)
+		}
+	}
+
+	addr := fmt.Sprintf(":%d", cfg.Port)
+	log.Printf("dag-engine server starting on http://0.0.0.0%s", addr)
+	log.Printf("dags dir: %s", cfg.DagsDir)
+	log.Printf("database: %s", cfg.DBPath)
+
+	srv := &http.Server{Addr: addr, Handler: handler}
+
+	// Graceful shutdown.
+	go func() {
+		sigCh := make(chan os.Signal, 1)
+		signal.Notify(sigCh, syscall.SIGINT, syscall.SIGTERM)
+		<-sigCh
+		log.Println("shutting down...")
+		scheduler.Stop()
+		srv.Shutdown(context.Background())
+	}()
+
+	if err := srv.ListenAndServe(); err != http.ErrServerClosed {
+		log.Fatalf("server: %v", err)
+	}
+}
@@ -0,0 +1,30 @@
+package main
+
+import (
+	"log"
+	"net/http"
+	"time"
+)
+
+// corsMiddleware adds permissive CORS headers for development.
+func corsMiddleware(next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Access-Control-Allow-Origin", "*")
+		w.Header().Set("Access-Control-Allow-Methods", "GET, POST, PUT, DELETE, OPTIONS")
+		w.Header().Set("Access-Control-Allow-Headers", "Content-Type, Authorization")
+		if r.Method == http.MethodOptions {
+			w.WriteHeader(http.StatusNoContent)
+			return
+		}
+		next.ServeHTTP(w, r)
+	})
+}
+
+// loggingMiddleware logs each HTTP request with method, path and duration.
+func loggingMiddleware(next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		start := time.Now()
+		next.ServeHTTP(w, r)
+		log.Printf("%s %s %s", r.Method, r.URL.Path, time.Since(start).Round(time.Millisecond))
+	})
+}
@@ -0,0 +1,188 @@
+package main
+
+import (
+	"context"
+	"fmt"
+	"log"
+	"os"
+	"path/filepath"
+	"strings"
+	"sync"
+	"time"
+
+	"fn-registry/functions/core"
+	"fn-registry/functions/infra"
+)
+
+// ScheduledDAG represents a DAG with a parsed cron schedule.
+type ScheduledDAG struct {
+	Name     string    `json:"name"`
+	Path     string    `json:"path"`
+	Schedule string    `json:"schedule"`
+	NextRun  time.Time `json:"next_run"`
+}
+
+// Scheduler manages cron-triggered DAG execution.
+type Scheduler struct {
+	mu       sync.Mutex
+	running  bool
+	cancel   context.CancelFunc
+	dagsDir  string
+	executor *Executor
+	dags     []ScheduledDAG
+}
+
+// NewScheduler creates a new scheduler.
+func NewScheduler(executor *Executor, dagsDir string) *Scheduler {
+	return &Scheduler{
+		executor: executor,
+		dagsDir:  dagsDir,
+	}
+}
+
+// Start scans for DAGs with schedules and starts cron tickers for each.
+func (s *Scheduler) Start() error {
+	s.mu.Lock()
+	if s.running {
+		s.mu.Unlock()
+		return fmt.Errorf("scheduler already running")
+	}
+
+	ctx, cancel := context.WithCancel(context.Background())
+	s.cancel = cancel
+	s.running = true
+	s.mu.Unlock()
+
+	scheduled, err := s.scanDAGs()
+	if err != nil {
+		s.mu.Lock()
+		s.running = false
+		s.mu.Unlock()
+		cancel()
+		return err
+	}
+
+	s.mu.Lock()
+	s.dags = scheduled
+	s.mu.Unlock()
+
+	log.Printf("[scheduler] started with %d DAGs", len(scheduled))
+
+	for _, dag := range scheduled {
+		dag := dag
+		go s.runTicker(ctx, dag)
+	}
+
+	return nil
+}
+
+// Stop cancels all tickers and stops the scheduler.
+func (s *Scheduler) Stop() {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	if !s.running {
+		return
+	}
+	s.cancel()
+	s.running = false
+	s.dags = nil
+	log.Printf("[scheduler] stopped")
+}
+
+// IsRunning returns true if the scheduler is active.
+func (s *Scheduler) IsRunning() bool {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	return s.running
+}
+
+// Status returns the list of scheduled DAGs with their next run time.
+type SchedulerStatus struct {
+	Running bool           `json:"running"`
+	DAGs    []ScheduledDAG `json:"dags"`
+}
+
+func (s *Scheduler) Status() SchedulerStatus {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	return SchedulerStatus{
+		Running: s.running,
+		DAGs:    s.dags,
+	}
+}
+
+// scanDAGs reads the dags directory and returns DAGs that have cron schedules.
+func (s *Scheduler) scanDAGs() ([]ScheduledDAG, error) {
+	entries, err := os.ReadDir(s.dagsDir)
+	if err != nil {
+		return nil, err
+	}
+
+	var scheduled []ScheduledDAG
+	for _, entry := range entries {
+		ext := filepath.Ext(entry.Name())
+		if ext != ".yaml" && ext != ".yml" {
+			continue
+		}
+
+		path := filepath.Join(s.dagsDir, entry.Name())
+		data, err := os.ReadFile(path)
+		if err != nil {
+			continue
+		}
+
+		dag, err := core.DagParse(data)
+		if err != nil {
+			continue
+		}
+
+		for _, expr := range dag.Schedule {
+			sched, err := core.ParseCronExpr(strings.TrimSpace(expr))
+			if err != nil {
+				log.Printf("[scheduler] invalid cron %q in %s: %v", expr, dag.Name, err)
+				continue
+			}
+			next := core.NextCronTime(sched, time.Now())
+			scheduled = append(scheduled, ScheduledDAG{
+				Name:     dag.Name,
+				Path:     path,
+				Schedule: expr,
+				NextRun:  next,
+			})
+		}
+	}
+
+	return scheduled, nil
+}
+
+// runTicker starts a cron ticker for a single DAG schedule.
+func (s *Scheduler) runTicker(ctx context.Context, dag ScheduledDAG) {
+	sched, err := core.ParseCronExpr(strings.TrimSpace(dag.Schedule))
+	if err != nil {
+		return
+	}
+
+	// Convert core.CronSchedule to infra.CronTickerSchedule.
+	tickerSched := infra.CronTickerSchedule{
+		Minute:     sched.Minute,
+		Hour:       sched.Hour,
+		DayOfMonth: sched.DayOfMonth,
+		Month:      sched.Month,
+		DayOfWeek:  sched.DayOfWeek,
+	}
+
+	ch := infra.CronTicker(tickerSched, ctx)
+	log.Printf("[scheduler] ticker started for %s (%s), next: %s", dag.Name, dag.Schedule, dag.NextRun.Format(time.RFC3339))
+
+	for t := range ch {
+		log.Printf("[scheduler] triggered %s at %s", dag.Name, t.Format(time.RFC3339))
+		go func() {
+			runID, err := s.executor.ExecuteDAG(ctx, dag.Path, "cron")
+			if err != nil {
+				log.Printf("[scheduler] %s failed: %v (run: %s)", dag.Name, err, runID)
+			} else {
+				log.Printf("[scheduler] %s completed (run: %s)", dag.Name, runID)
+			}
+		}()
+	}
+}
@@ -0,0 +1,29 @@
+CREATE TABLE IF NOT EXISTS dag_runs (
+    id          TEXT PRIMARY KEY,
+    dag_name    TEXT NOT NULL,
+    dag_path    TEXT NOT NULL DEFAULT '',
+    status      TEXT NOT NULL DEFAULT 'pending' CHECK(status IN ('pending','running','success','failed','cancelled')),
+    trigger     TEXT NOT NULL DEFAULT 'manual' CHECK(trigger IN ('manual','cron','api')),
+    started_at  TEXT NOT NULL,
+    finished_at TEXT,
+    error       TEXT NOT NULL DEFAULT ''
+);
+
+CREATE TABLE IF NOT EXISTS dag_step_results (
+    id          TEXT PRIMARY KEY,
+    run_id      TEXT NOT NULL REFERENCES dag_runs(id) ON DELETE CASCADE,
+    step_name   TEXT NOT NULL,
+    status      TEXT NOT NULL DEFAULT 'pending' CHECK(status IN ('pending','running','success','failed','skipped')),
+    exit_code   INTEGER NOT NULL DEFAULT -1,
+    stdout      TEXT NOT NULL DEFAULT '',
+    stderr      TEXT NOT NULL DEFAULT '',
+    started_at  TEXT,
+    finished_at TEXT,
+    duration_ms INTEGER NOT NULL DEFAULT 0,
+    error       TEXT NOT NULL DEFAULT ''
+);
+
+CREATE INDEX IF NOT EXISTS idx_runs_dag_name ON dag_runs(dag_name);
+CREATE INDEX IF NOT EXISTS idx_runs_status ON dag_runs(status);
+CREATE INDEX IF NOT EXISTS idx_runs_started ON dag_runs(started_at DESC);
+CREATE INDEX IF NOT EXISTS idx_step_results_run ON dag_step_results(run_id);
@@ -0,0 +1,231 @@
+package store
+
+import (
+	"database/sql"
+	_ "embed"
+	"fmt"
+	"time"
+
+	_ "github.com/mattn/go-sqlite3"
+)
+
+//go:embed migrations/001_init.sql
+var migrationSQL string
+
+// DB wraps a SQLite connection for DAG run persistence.
+type DB struct {
+	conn *sql.DB
+	path string
+}
+
+// Open opens or creates a DAG engine database at the given path.
+func Open(path string) (*DB, error) {
+	conn, err := sql.Open("sqlite3", path+"?_journal_mode=WAL&_busy_timeout=5000&_foreign_keys=on")
+	if err != nil {
+		return nil, fmt.Errorf("store: open %s: %w", path, err)
+	}
+	if _, err := conn.Exec(migrationSQL); err != nil {
+		conn.Close()
+		return nil, fmt.Errorf("store: migrate: %w", err)
+	}
+	return &DB{conn: conn, path: path}, nil
+}
+
+// Close closes the database connection.
+func (db *DB) Close() error {
+	return db.conn.Close()
+}
+
+// --- DagRun CRUD ---
+
+// DagRun mirrors infra.DagRun for the store layer.
+type DagRun struct {
+	ID         string
+	DagName    string
+	DagPath    string
+	Status     string
+	Trigger    string
+	StartedAt  time.Time
+	FinishedAt *time.Time
+	Error      string
+}
+
+// CreateRun inserts a new run record.
+func (db *DB) CreateRun(run *DagRun) error {
+	_, err := db.conn.Exec(
+		`INSERT INTO dag_runs (id, dag_name, dag_path, status, trigger, started_at, error)
+		 VALUES (?, ?, ?, ?, ?, ?, ?)`,
+		run.ID, run.DagName, run.DagPath, run.Status, run.Trigger,
+		run.StartedAt.Format(time.RFC3339), run.Error,
+	)
+	return err
+}
+
+// UpdateRunStatus updates a run's status and optionally its finished_at and error.
+func (db *DB) UpdateRunStatus(id, status string, finishedAt *time.Time, errMsg string) error {
+	var fin *string
+	if finishedAt != nil {
+		s := finishedAt.Format(time.RFC3339)
+		fin = &s
+	}
+	_, err := db.conn.Exec(
+		`UPDATE dag_runs SET status=?, finished_at=?, error=? WHERE id=?`,
+		status, fin, errMsg, id,
+	)
+	return err
+}
+
+// GetRun retrieves a single run by ID.
+func (db *DB) GetRun(id string) (*DagRun, error) {
+	row := db.conn.QueryRow(
+		`SELECT id, dag_name, dag_path, status, trigger, started_at, finished_at, error
+		 FROM dag_runs WHERE id=?`, id,
+	)
+	return scanRun(row)
+}
+
+// ListRuns returns runs, newest first, with optional dag name filter.
+func (db *DB) ListRuns(dagName string, limit, offset int) ([]DagRun, int, error) {
+	var total int
+	var args []interface{}
+	where := ""
+	if dagName != "" {
+		where = " WHERE dag_name=?"
+		args = append(args, dagName)
+	}
+	err := db.conn.QueryRow("SELECT COUNT(*) FROM dag_runs"+where, args...).Scan(&total)
+	if err != nil {
+		return nil, 0, err
+	}
+
+	query := "SELECT id, dag_name, dag_path, status, trigger, started_at, finished_at, error FROM dag_runs" +
+		where + " ORDER BY started_at DESC LIMIT ? OFFSET ?"
+	args = append(args, limit, offset)
+
+	rows, err := db.conn.Query(query, args...)
+	if err != nil {
+		return nil, 0, err
+	}
+	defer rows.Close()
+
+	var runs []DagRun
+	for rows.Next() {
+		r, err := scanRunRows(rows)
+		if err != nil {
+			return nil, 0, err
+		}
+		runs = append(runs, *r)
+	}
+	return runs, total, rows.Err()
+}
+
+// --- DagStepResult CRUD ---
+
+// DagStepResult mirrors infra.DagStepResult for the store layer.
+type DagStepResult struct {
+	ID         string
+	RunID      string
+	StepName   string
+	Status     string
+	ExitCode   int
+	Stdout     string
+	Stderr     string
+	StartedAt  *time.Time
+	FinishedAt *time.Time
+	DurationMs int64
+	Error      string
+}
+
+// InsertStepResult inserts a new step result.
+func (db *DB) InsertStepResult(r *DagStepResult) error {
+	var startedAt, finishedAt *string
+	if r.StartedAt != nil {
+		s := r.StartedAt.Format(time.RFC3339)
+		startedAt = &s
+	}
+	if r.FinishedAt != nil {
+		s := r.FinishedAt.Format(time.RFC3339)
+		finishedAt = &s
+	}
+	_, err := db.conn.Exec(
+		`INSERT INTO dag_step_results (id, run_id, step_name, status, exit_code, stdout, stderr, started_at, finished_at, duration_ms, error)
+		 VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)`,
+		r.ID, r.RunID, r.StepName, r.Status, r.ExitCode, r.Stdout, r.Stderr,
+		startedAt, finishedAt, r.DurationMs, r.Error,
+	)
+	return err
+}
+
+// UpdateStepResult updates a step result by ID.
+func (db *DB) UpdateStepResult(id, status string, exitCode int, stdout, stderr string, finishedAt *time.Time, durationMs int64, errMsg string) error {
+	var fin *string
+	if finishedAt != nil {
+		s := finishedAt.Format(time.RFC3339)
+		fin = &s
+	}
+	_, err := db.conn.Exec(
+		`UPDATE dag_step_results SET status=?, exit_code=?, stdout=?, stderr=?, finished_at=?, duration_ms=?, error=? WHERE id=?`,
+		status, exitCode, stdout, stderr, fin, durationMs, errMsg, id,
+	)
+	return err
+}
+
+// ListStepResults returns all step results for a given run.
+func (db *DB) ListStepResults(runID string) ([]DagStepResult, error) {
+	rows, err := db.conn.Query(
+		`SELECT id, run_id, step_name, status, exit_code, stdout, stderr, started_at, finished_at, duration_ms, error
+		 FROM dag_step_results WHERE run_id=? ORDER BY started_at ASC`, runID,
+	)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+
+	var results []DagStepResult
+	for rows.Next() {
+		var r DagStepResult
+		var startedAt, finishedAt sql.NullString
+		if err := rows.Scan(&r.ID, &r.RunID, &r.StepName, &r.Status, &r.ExitCode,
+			&r.Stdout, &r.Stderr, &startedAt, &finishedAt, &r.DurationMs, &r.Error); err != nil {
+			return nil, err
+		}
+		if startedAt.Valid {
+			t, _ := time.Parse(time.RFC3339, startedAt.String)
+			r.StartedAt = &t
+		}
+		if finishedAt.Valid {
+			t, _ := time.Parse(time.RFC3339, finishedAt.String)
+			r.FinishedAt = &t
+		}
+		results = append(results, r)
+	}
+	return results, rows.Err()
+}
+
+// --- scan helpers ---
+
+type scanner interface {
+	Scan(dest ...interface{}) error
+}
+
+func scanRun(s scanner) (*DagRun, error) {
+	var r DagRun
+	var startedAt string
+	var finishedAt sql.NullString
+	if err := s.Scan(&r.ID, &r.DagName, &r.DagPath, &r.Status, &r.Trigger, &startedAt, &finishedAt, &r.Error); err != nil {
+		if err == sql.ErrNoRows {
+			return nil, nil
+		}
+		return nil, err
+	}
+	r.StartedAt, _ = time.Parse(time.RFC3339, startedAt)
+	if finishedAt.Valid {
+		t, _ := time.Parse(time.RFC3339, finishedAt.String)
+		r.FinishedAt = &t
+	}
+	return &r, nil
+}
+
+func scanRunRows(rows *sql.Rows) (*DagRun, error) {
+	return scanRun(rows)
+}