Revert "fix(bookmarks): upsert on title conflict so position upgrades don't 500"

This reverts commit 27b3dcb69f.

internal/database/querier.go

@@ -1,6 +1,6 @@
 // Code generated by sqlc. DO NOT EDIT.
 // versions:
-//   sqlc v1.31.1
+//   sqlc v1.30.0
 
 package database
 
@@ -60,10 +60,6 @@ type Querier interface {
 	// Libraries queries
 	CreateLibrary(ctx context.Context, arg CreateLibraryParams) (Libraries, error)
 	CreateMediaBookmark(ctx context.Context, arg CreateMediaBookmarkParams) (MediaBookmarks, error)
-	// The dedup key can change while the title stays the same (e.g. a client
-	// upgrading a bookmark from percentage-only to a CFI position), so the
-	// title UNIQUE constraint races the dedup-key lookup. Upsert on the title
-	// slot: the conflicting row is by definition the same bookmark.
 	CreateMediaBookmarkFull(ctx context.Context, arg CreateMediaBookmarkFullParams) (MediaBookmarks, error)
 	// Media Highlights queries
 	CreateMediaHighlight(ctx context.Context, arg CreateMediaHighlightParams) (MediaHighlights, error)