Add logging to repo_helper to get timing info.

apps/explorer/lib/explorer/repo/repo_helper.ex

@@ -35,16 +35,32 @@ defmodule Explorer.Repo.RepoHelper do
 
         chunk_size = Keyword.get(opts, :chunk_size, @chunk_size)
 
+        chunks = ceil(length(elements) / chunk_size)
+        if chunks > 1 do
+          Logger.info("!!!! safe_insert_all #{kind |> to_string()} chunks #{chunks}")
+        end
+
+        global_insert_start = System.monotonic_time()
+
         elements
         |> Enum.chunk_every(chunk_size)
         |> Enum.reduce({0, []}, fn chunk, {total_count, acc} ->
+          local_insert_start = System.monotonic_time()
+
           {count, inserted} =
             try do
-              __MODULE__.insert_all(kind, chunk, opts)
+              result = __MODULE__.insert_all(kind, chunk, opts)
+              if chunks > 1  do
+                local_insert_end = System.monotonic_time()
+                Logger.info("!!!! inserted #{kind |> to_string()} in #{local_insert_end - local_insert_start} (global #{local_insert_end - global_insert_start})")
+              end
+              result
             rescue
               exception ->
                 old_truncate = Application.get_env(:logger, :truncate)
                 Logger.configure(truncate: :infinity)
+                failed = System.monotonic_time()
+                Logger.info("!!!! failed #{kind |> to_string()} in #{failed - local_insert_start} (global #{failed - global_insert_start})")
 
                 Logger.error(fn ->
                   [