Enforce study lesson release locks and schedule biweekly Monday dates

server.js

@@ -111,6 +111,36 @@ function sanitizeUrl(value) {
   return ''
 }
 
+function isSectionReleased(section) {
+  if (!section || typeof section !== 'object') return false
+  if (typeof section.releasedAt !== 'string' || !section.releasedAt.trim()) return true
+  const releaseTime = Date.parse(section.releasedAt)
+  if (!Number.isFinite(releaseTime)) return true
+  return releaseTime <= Date.now()
+}
+
+function filterSiteContentByReleaseDate(siteContent) {
+  if (!siteContent || typeof siteContent !== 'object' || Array.isArray(siteContent)) return siteContent
+
+  const filteredStudies = Array.isArray(siteContent.studies)
+    ? siteContent.studies.map(study => {
+      if (!study || typeof study !== 'object') return study
+      const sections = Array.isArray(study.sections) ? study.sections.filter(isSectionReleased) : []
+      return { ...study, sections }
+    })
+    : siteContent.studies
+
+  const filteredLegacySections = Array.isArray(siteContent.colossiansStudySections)
+    ? siteContent.colossiansStudySections.filter(isSectionReleased)
+    : siteContent.colossiansStudySections
+
+  return {
+    ...siteContent,
+    studies: filteredStudies,
+    colossiansStudySections: filteredLegacySections,
+  }
+}
+
 function sanitizeRedirectRules(value) {
   const source = Array.isArray(value) ? value : []
   const seen = new Set()
@@ -1278,6 +1308,12 @@ app.get('/api/admin-content', async (req, res) => {
 
   try {
     const parsed = await loadSiteContentFile(source === 'draft' ? DRAFT_DATA_FILE : DATA_FILE)
+    if (source === 'published') {
+      const safeSiteContent = filterSiteContentByReleaseDate(parsed.siteContent)
+      res.json({ ...parsed, siteContent: safeSiteContent })
+      return
+    }
+
     res.json(parsed)
   } catch {
     if (source === 'draft') {