🧪 Reproduce failing sync from zero

internal/store/sync_store_test.go

@@ -83,6 +83,33 @@ func TestSyncPruneStaleClient(t *testing.T) {
 	}
 }
 
+func TestSyncBootstrapAfterPruneReturnsLatestData(t *testing.T) {
+	s := mustSyncStore(t)
+	ctx := context.Background()
+
+	old := &domain.Entry{ID: "old", DayKey: "2026-01-01", UpdatedAt: time.Now().Add(-31 * 24 * time.Hour).UnixMilli()}
+	latest := &domain.Entry{ID: "latest", DayKey: "2026-02-01", UpdatedAt: time.Now().UnixMilli()}
+	if err := s.LogEntry(ctx, old); err != nil {
+		t.Fatal(err)
+	}
+	if err := s.Prune(ctx, -time.Millisecond); err != nil {
+		t.Fatal(err)
+	}
+	if err := s.LogEntry(ctx, latest); err != nil {
+		t.Fatal(err)
+	}
+
+	// A zero-version client has no history to reconcile. It should receive
+	// current data rather than being rejected because older history was pruned.
+	changes, _, err := s.Pull(ctx, 0)
+	if err != nil {
+		t.Fatalf("bootstrap should return latest data after pruning, got %v", err)
+	}
+	if len(changes) != 1 || changes[0].EntityID != "latest" {
+		t.Fatalf("expected only latest data, got %+v", changes)
+	}
+}
+
 func TestSyncPruneNoRows(t *testing.T) {
 	s := mustSyncStore(t)
 	ctx := context.Background()