Track initial deployment of Format Preview tracking

Author: cpeel

pinc/page_table.inc

@@ -681,6 +681,8 @@ function echo_cells_for_round(
             $format_preview_status = '';
         } elseif ($round_data["format_preview_ran"]) {
             $format_preview_status = '&nbsp;<span title="' . _('Format Preview was used on this page.') . '">&check;</span>';
+        } elseif ($R_time < 1765472400) {
+            $format_preview_status = '&nbsp;<span title="' . _('This page was saved before Format Preview usage was tracked.') . '">?</span>';
         } else {
             $format_preview_status = '&nbsp;<span title="' . _('Format Preview was not used on this page.') . '">&#x2717;</span>';
         }

project.php

@@ -840,6 +840,8 @@ function recentlyproofed(int $wlist): void
                 $format_preview_status = '';
             } elseif ($row["format_preview_status"] > 0) {
                 $format_preview_status = '&nbsp;<span title="' . _('Format Preview was used on this page.') . '">&check;</span>';
+            } elseif ($timestamp < 1765472400) {
+                $format_preview_status = '&nbsp;<span title="' . _('This page was saved before Format Preview usage was tracked.') . '">?</span>';
             } else {
                 $format_preview_status = '&nbsp;<span title="' . _('Format Preview was not used on this page.') . '">&#x2717;</span>';
             }