add Cloudflare R2 storage integration and update bug report handling

internal/timing/timing.go

@@ -0,0 +1,50 @@
+package timing
+
+import (
+	"context"
+	"time"
+)
+
+type contextKey struct{}
+
+// Checkpoint is a named point in time recorded during request processing.
+type Checkpoint struct {
+	Name string
+	At   time.Time
+}
+
+// Timer records the request start time and named checkpoints.
+type Timer struct {
+	Start       time.Time
+	checkpoints []Checkpoint
+}
+
+// Mark records a checkpoint with the given name.
+func (t *Timer) Mark(name string) {
+	t.checkpoints = append(t.checkpoints, Checkpoint{Name: name, At: time.Now()})
+}
+
+// Checkpoints returns all recorded checkpoints in order.
+func (t *Timer) Checkpoints() []Checkpoint {
+	return t.checkpoints
+}
+
+// NewContext attaches a new Timer to ctx and returns both.
+func NewContext(ctx context.Context) (context.Context, *Timer) {
+	t := &Timer{Start: time.Now()}
+	return context.WithValue(ctx, contextKey{}, t), t
+}
+
+// FromContext retrieves the Timer from ctx, or nil if not present.
+func FromContext(ctx context.Context) *Timer {
+	t, _ := ctx.Value(contextKey{}).(*Timer)
+	return t
+}
+
+// Mark records a checkpoint in the Timer stored in ctx, if any.
+// It is a no-op when ctx carries no Timer (e.g. in tests).
+func Mark(ctx context.Context, name string) {
+	if t := FromContext(ctx); t != nil {
+		t.Mark(name)
+	}
+}