Add optional pprof endpoint for debugging

cmd/server/main.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"log/slog"
 	"net/http"
+	_ "net/http/pprof" // registers /debug/pprof on http.DefaultServeMux (served only on PprofAddr)
 	"os"
 
 	"github.com/golang-migrate/migrate/v4"
@@ -48,6 +49,18 @@ func main() {
 
 	go scheduler.New(st, orch).Start(context.Background())
 
+	// Optional pprof endpoint on a separate, non-published listener so we can
+	// pull live goroutine dumps (docker compose exec app wget -qO-
+	// localhost:6060/debug/pprof/goroutine?debug=2) without killing the process.
+	if cfg.PprofAddr != "" {
+		go func() {
+			slog.Info("pprof listening", "addr", cfg.PprofAddr)
+			if err := http.ListenAndServe(cfg.PprofAddr, nil); err != nil {
+				slog.Error("pprof serve", "err", err)
+			}
+		}()
+	}
+
 	slog.Info("listening", "addr", cfg.HTTPAddr)
 	if err := http.ListenAndServe(cfg.HTTPAddr, srv.Router()); err != nil {
 		slog.Error("serve", "err", err)

docker-compose.yml

@@ -22,6 +22,7 @@ services:
       ENC_KEY: ${ENC_KEY}
       SESSION_SECRET: ${SESSION_SECRET}
       WORKER_CONCURRENCY: ${WORKER_CONCURRENCY:-4}
+      PPROF_ADDR: ${PPROF_ADDR:-:6060}
     depends_on:
       postgres:
         condition: service_healthy

internal/config/config.go

@@ -15,6 +15,7 @@ type Config struct {
 	EncKey            []byte
 	SessionSecret     []byte
 	WorkerConcurrency int
+	PprofAddr         string // if non-empty, serve net/http/pprof here (e.g. ":6060")
 }
 
 func Load() (Config, error) {
@@ -25,6 +26,7 @@ func Load() (Config, error) {
 		AuthPass:          os.Getenv("AUTH_PASS"),
 		SessionSecret:     []byte(os.Getenv("SESSION_SECRET")),
 		WorkerConcurrency: 4,
+		PprofAddr:         os.Getenv("PPROF_ADDR"),
 	}
 	if v := os.Getenv("WORKER_CONCURRENCY"); v != "" {
 		n, err := strconv.Atoi(v)