fix

internal/storage/clickhouse_traces.go

@@ -213,6 +213,44 @@ func (s *ClickHouseStore) AppendOccurrence(ctx context.Context, occ Occurrence)
 	return nil
 }
 
+// RecentOccurrences returns persisted issue occurrences in chronological
+// order so the in-memory issue tracker can be rebuilt after a restart.
+func (s *ClickHouseStore) RecentOccurrences(ctx context.Context, limit int) ([]Occurrence, error) {
+	if limit <= 0 {
+		limit = 100000
+	}
+	rows, err := s.conn.Query(ctx, fmt.Sprintf(`
+		SELECT issue_id, kind, service, toUnixTimestamp64Nano(timestamp), trace_id, span_id, sample
+		FROM %s.issue_occurrences
+		ORDER BY timestamp DESC
+		LIMIT ?`, s.db), limit)
+	if err != nil {
+		return nil, fmt.Errorf("clickhouse recent issue occurrences: %w", err)
+	}
+	defer rows.Close()
+	var out []Occurrence
+	for rows.Next() {
+		var o Occurrence
+		var ts int64
+		var sample string
+		if err := rows.Scan(&o.IssueID, &o.Kind, &o.Service, &ts, &o.TraceID, &o.SpanID, &sample); err != nil {
+			return nil, fmt.Errorf("scan issue occurrence: %w", err)
+		}
+		o.Timestamp = ts
+		o.Sample = json.RawMessage(sample)
+		out = append(out, o)
+	}
+	if err := rows.Err(); err != nil {
+		return nil, fmt.Errorf("iterate issue occurrences: %w", err)
+	}
+	// The query is newest-first; replay oldest-first to preserve issue titles
+	// and trend buckets as they were originally observed.
+	for i, j := 0, len(out)-1; i < j; i, j = i+1, j-1 {
+		out[i], out[j] = out[j], out[i]
+	}
+	return out, nil
+}
+
 const maxSamplesPerIssueTrace = 20
 const maxUntraced = 20
 

internal/storage/store.go

@@ -134,6 +134,7 @@ type IssueTracesPage struct {
 // did this issue happen in" in one query (ClickHouseStore).
 type OccurrenceStore interface {
 	AppendOccurrence(ctx context.Context, occ Occurrence) error
+	RecentOccurrences(ctx context.Context, limit int) ([]Occurrence, error)
 	IssueTraces(ctx context.Context, issueID string, opts IssueTracesOptions) (IssueTracesPage, error)
 	IssueSources(ctx context.Context, issueID string) ([]IssueSource, error)
 }