fix: make slug rename and content update atomic via RenameAndUpsertPost

Previously RenamePost + UpsertPost were two separate DB calls; a failure
between them left the post at the new slug with stale content. The new
RenameAndUpsertPost method does both in a single transaction.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

1 files changed, 23 insertions, 23 deletions

diff --git a/internal/admin/server.go b/internal/admin/server.go
index dd2842a..c0400de 100644
--- a/internal/admin/server.go
+++ b/internal/admin/server.go
@@ -265,6 +265,16 @@ func (s *Server) handleEdit(c *gin.Context) {
 
 		targetSlug := slug // default: slug unchanged
 
+		record := db.PostRecord{
+			Slug:      targetSlug,
+			Title:     updated.Title,
+			Date:      updated.Date,
+			Tags:      updated.Tags,
+			Draft:     updated.Draft,
+			Blocks:    updated.Blocks,
+			UpdatedAt: time.Now().UnixMicro(),
+		}
+
 		if updated.Slug != "" && updated.Slug != slug {
 			// Slug rename requested
 			if !validSlug.MatchString(updated.Slug) {
@@ -276,35 +286,25 @@ func (s *Server) handleEdit(c *gin.Context) {
 				s.renderError(c, fmt.Sprintf("Post %q already exists", updated.Slug))
 				return
 			}
-			// Perform rename (creates redirect, collapses chains)
-			if err := s.MetaDB.RenamePost(slug, updated.Slug); err != nil {
+			// Atomically rename and update content in one transaction
+			record.Slug = updated.Slug
+			if err := s.MetaDB.RenameAndUpsertPost(slug, record); err != nil {
 				s.renderError(c, "Failed to rename post: "+err.Error())
 				return
 			}
-			// Invalidate old cache
+			// Invalidate old cache and remove old search entry
 			s.invalidatePostCache(slug)
-			// Remove old search index entry
 			_ = s.SearchDB.DeletePage("/" + slug)
 			targetSlug = updated.Slug
-		}
-
-		// Update content under the (possibly new) slug
-		record := db.PostRecord{
-			Slug:      targetSlug,
-			Title:     updated.Title,
-			Date:      updated.Date,
-			Tags:      updated.Tags,
-			Draft:     updated.Draft,
-			Blocks:    updated.Blocks,
-			UpdatedAt: time.Now().UnixMicro(),
-		}
-		if err := s.MetaDB.UpsertPost(record); err != nil {
-			c.HTML(http.StatusInternalServerError, "base", gin.H{
-				"Title":           "Error",
-				"ContentTemplate": "error-content",
-				"Message":         err.Error(),
-			})
-			return
+		} else {
+			if err := s.MetaDB.UpsertPost(record); err != nil {
+				c.HTML(http.StatusInternalServerError, "base", gin.H{
+					"Title":           "Error",
+					"ContentTemplate": "error-content",
+					"Message":         err.Error(),
+				})
+				return
+			}
 		}
 
 		// Invalidate cache for the target slug