diff --git a/src/mdbx.c b/src/mdbx.c
index be9594cc..d8e40bc4 100644
--- a/src/mdbx.c
+++ b/src/mdbx.c
@@ -8931,131 +8931,6 @@ static int __must_check_result mdbx_node_add_leaf(MDBX_cursor *mc,
   return MDBX_SUCCESS;
 }
 
-#if 0
-/* Add a node to the page pointed to by the cursor.
- * Set MDBX_TXN_ERROR on failure.
- *
- * [in] mc    The cursor for this operation.
- * [in] indx  The index on the page where the new node should be added.
- * [in] key   The key for the new node.
- * [in] data  The data for the new node, if any.
- * [in] pgno  The page number, if adding a branch node.
- * [in] flags Flags for the node.
- *
- * Returns 0 on success, non-zero on failure. Possible errors are:
- *
- * MDBX_ENOMEM    - failed to allocate overflow pages for the node.
- * MDBX_PAGE_FULL  - there is insufficient room in the page. This error
- *                  should never happen since all callers already calculate
- *                  the page's free space before calling this function. */
-static int mdbx_node_add(MDBX_cursor *mc, unsigned indx, const MDBX_val *key,
-                         MDBX_val *data, pgno_t pgno, unsigned flags) {
-  unsigned i;
-  size_t node_size = NODESIZE;
-  intptr_t room;
-  MDBX_node *node;
-  MDBX_page *mp = mc->mc_pg[mc->mc_top];
-  MDBX_page *ofp = NULL; /* overflow page */
-  void *ndata;
-
-  mdbx_cassert(mc, mp->mp_upper >= mp->mp_lower);
-
-  DKBUF;
-  mdbx_debug("add to %s %spage %" PRIaPGNO " index %i, data size %" PRIuPTR
-             " key size %" PRIuPTR " [%s]",
-             IS_LEAF(mp) ? "leaf" : "branch", IS_SUBP(mp) ? "sub-" : "",
-             mp->mp_pgno, indx, data ? data->iov_len : 0,
-             key ? key->iov_len : 0, DKEY(key));
-
-  room = (intptr_t)SIZELEFT(mp) - (intptr_t)sizeof(indx_t);
-  if (key != NULL)
-    node_size += key->iov_len;
-  if (IS_LEAF(mp)) {
-    mdbx_cassert(mc, key && data);
-    if (unlikely(F_ISSET(flags, F_BIGDATA))) {
-      /* Data already on overflow page. */
-      node_size += sizeof(pgno_t);
-    } else if (unlikely(node_size + data->iov_len >
-                        mc->mc_txn->mt_env->me_nodemax)) {
-      pgno_t ovpages = OVPAGES(mc->mc_txn->mt_env, data->iov_len);
-      int rc;
-      /* Put data on overflow page. */
-      mdbx_debug("data size is %" PRIuPTR ", node would be %" PRIuPTR
-                 ", put data on overflow page",
-                 data->iov_len, node_size + data->iov_len);
-      node_size = EVEN(node_size + sizeof(pgno_t));
-      if ((intptr_t)node_size > room)
-        goto full;
-      if ((rc = mdbx_page_new(mc, P_OVERFLOW, ovpages, &ofp)))
-        return rc;
-      mdbx_debug("allocated overflow page %" PRIaPGNO, ofp->mp_pgno);
-      flags |= F_BIGDATA;
-      goto update;
-    } else {
-      node_size += data->iov_len;
-    }
-  }
-  node_size = EVEN(node_size);
-  if (unlikely((intptr_t)node_size > room))
-    goto full;
-
-update:
-  /* Move higher pointers up one slot. */
-  for (i = NUMKEYS(mp); i > indx; i--)
-    mp->mp_ptrs[i] = mp->mp_ptrs[i - 1];
-
-  /* Adjust free space offsets. */
-  size_t ofs = mp->mp_upper - node_size;
-  mdbx_cassert(mc, ofs >= mp->mp_lower + sizeof(indx_t));
-  mdbx_cassert(mc, ofs <= UINT16_MAX);
-  mp->mp_ptrs[indx] = (uint16_t)ofs;
-  mp->mp_upper = (uint16_t)ofs;
-  mp->mp_lower += sizeof(indx_t);
-
-  /* Write the node data. */
-  node = NODEPTR(mp, indx);
-  node->mn_ksize = (key == NULL) ? 0 : (uint16_t)key->iov_len;
-  node->mn_flags = (uint16_t)flags;
-  if (IS_LEAF(mp))
-    SETDSZ(node, data->iov_len);
-  else
-    SETPGNO(node, pgno);
-
-  if (key)
-    memcpy(NODEKEY(node), key->iov_base, key->iov_len);
-
-  if (IS_LEAF(mp)) {
-    ndata = NODEDATA(node);
-    if (likely(ofp == NULL)) {
-      if (unlikely(F_ISSET(flags, F_BIGDATA)))
-        memcpy(ndata, data->iov_base, sizeof(pgno_t));
-      else if (F_ISSET(flags, MDBX_RESERVE))
-        data->iov_base = ndata;
-      else if (likely(ndata != data->iov_base))
-        memcpy(ndata, data->iov_base, data->iov_len);
-    } else {
-      memcpy(ndata, &ofp->mp_pgno, sizeof(pgno_t));
-      ndata = PAGEDATA(ofp);
-      if (F_ISSET(flags, MDBX_RESERVE))
-        data->iov_base = ndata;
-      else if (likely(ndata != data->iov_base))
-        memcpy(ndata, data->iov_base, data->iov_len);
-    }
-  }
-
-  return MDBX_SUCCESS;
-
-full:
-  mdbx_debug("not enough room in page %" PRIaPGNO ", got %u ptrs", mp->mp_pgno,
-             NUMKEYS(mp));
-  mdbx_debug("upper-lower = %u - %u = %" PRIiPTR, mp->mp_upper, mp->mp_lower,
-             room);
-  mdbx_debug("node size = %" PRIuPTR, node_size);
-  mc->mc_txn->mt_flags |= MDBX_TXN_ERROR;
-  return MDBX_PAGE_FULL;
-}
-#endif
-
 /* Delete the specified node from a page.
  * [in] mc Cursor pointing to the node to delete.
  * [in] ksize The size of a node. Only used if the page is