Bugfix

internal/state/store.go

@@ -4,6 +4,7 @@ import (
 	"bufio"
 	"encoding/json"
 	"errors"
+	"fmt"
 	"os"
 	"path/filepath"
 	"sort"
@@ -25,6 +26,15 @@ func Open(dir string, maxRuns int) (*Store, error) {
 		return nil, err
 	}
 	s := &Store{path: filepath.Join(dir, "runs.jsonl"), processed: map[string]struct{}{}, maxRuns: maxRuns}
+	// Fail fast during startup if the persistent data path is not writable.
+	// A read-only/root-owned Docker volume must not be discovered only after the first ticket.
+	f, err := os.OpenFile(s.path, os.O_CREATE|os.O_APPEND|os.O_WRONLY, 0o640)
+	if err != nil {
+		return nil, fmt.Errorf("state directory %q is not writable: %w", dir, err)
+	}
+	if err := f.Close(); err != nil {
+		return nil, fmt.Errorf("close state write probe: %w", err)
+	}
 	if err := s.load(); err != nil {
 		return nil, err
 	}