Add trap count data to source page

It's...way too many rows, now that I have the actual data. It needs to
be reworked.

fieldseeker.go

@@ -0,0 +1,15 @@
+package main
+
+import (
+	"time"
+
+	"github.com/aarondl/opt/null"
+)
+
+func fsTimestampToTime(t null.Val[int64]) *time.Time {
+	if t.IsNull() {
+		return nil
+	}
+	result := time.UnixMilli(t.MustGet())
+	return &result
+}