Remove redundant timestamp from usage hover card

lib/legion_web/usage_aggregator.ex

@@ -78,11 +78,9 @@ defmodule LegionWeb.UsageAggregator do
   @doc """
   Plain-text hover card for a list of usage entries.
 
-  A time line, then aligned columns for tokens and cost. One entry gets its
-  request time; several get the request count and their time span. Meant for
-  `white-space: pre` rendering in a monospace font.
+  Aligned columns for tokens and cost; several entries open with their request
+  count. Meant for `white-space: pre` rendering in a monospace font.
 
-      22:15:58 UTC
       input    4,930   cached     4,000
       output     132   reasoning    640
       cost    $0.003   estimated at list prices
@@ -92,24 +90,18 @@ defmodule LegionWeb.UsageAggregator do
     totals = totals(entries)
 
     Enum.join(
-      [
-        time_line(entries),
-        row("input", format_count(totals.input), "cached", format_count(totals.cached)),
-        row("output", format_count(totals.output), "reasoning", format_count(totals.reasoning)),
-        cost_line(totals.cost)
-      ],
+      count_line(entries) ++
+        [
+          row("input", format_count(totals.input), "cached", format_count(totals.cached)),
+          row("output", format_count(totals.output), "reasoning", format_count(totals.reasoning)),
+          cost_line(totals.cost)
+        ],
       "\n"
     )
   end
 
-  defp time_line([entry]), do: "#{format_time(entry["at"])} UTC"
-
-  defp time_line(entries) do
-    first = List.first(entries)
-    last = List.last(entries)
-
-    "#{length(entries)} requests · #{format_time(first["at"])} – #{format_time(last["at"])} UTC"
-  end
+  defp count_line([_]), do: []
+  defp count_line(entries), do: ["#{length(entries)} requests"]
 
   defp row(label, value, second_label, second_value) do
     String.pad_trailing(label, 6) <>
@@ -126,12 +118,6 @@ defmodule LegionWeb.UsageAggregator do
       String.pad_leading(format_cost(cost), 8) <> "   estimated at list prices"
   end
 
-  defp format_time(ms) when is_integer(ms) do
-    ms |> DateTime.from_unix!(:millisecond) |> Calendar.strftime("%H:%M:%S")
-  end
-
-  defp format_time(_), do: "--:--:--"
-
   defp add_cost(acc, cost) when is_number(cost), do: (acc || 0) + cost
   defp add_cost(acc, _), do: acc
 end

test/legion_web/components/trace_test.exs

@@ -26,7 +26,7 @@ defmodule LegionWeb.Components.TraceTest do
       html = render_component(&Trace.render/1, items: [step("x", [usage])], language: nil)
 
       assert html =~ "↑4.9k"
-      assert html =~ "22:15:58 UTC"
+      assert html =~ "input    4,930"
     end
 
     test "renders no chip on a step without usage" do

test/legion_web/components/usage_test.exs

@@ -56,7 +56,6 @@ defmodule LegionWeb.Components.UsageTest do
       assert html =~ "↑4.9k"
       assert html =~ "↓132"
       assert html =~ "$0.003"
-      assert html =~ "22:15:58 UTC"
       assert html =~ "reasoning    640"
     end
 
@@ -80,7 +79,7 @@ defmodule LegionWeb.Components.UsageTest do
       assert html =~ "↑10.0k"
       assert html =~ "↓544"
       assert html =~ "$0.007"
-      assert html =~ "2 requests · 22:15:58 – 22:16:07 UTC"
+      assert html =~ "2 requests"
     end
   end
 end

test/legion_web/usage_aggregator_test.exs

@@ -78,21 +78,19 @@ defmodule LegionWeb.UsageAggregatorTest do
       "at" => 1_700_000_158_000
     }
 
-    test "lays one request out as aligned columns under its time" do
+    test "lays one request out as aligned columns" do
       assert Usage.card([@entry]) ==
                """
-               22:15:58 UTC
                input    4,930   cached     4,000
                output     132   reasoning    640
                cost    $0.003   estimated at list prices\
                """
     end
 
-    test "opens with the request count and time span for several entries" do
+    test "opens with the request count for several entries" do
       second = %{@entry | "at" => 1_700_000_167_000, "input_tokens" => 5_070}
 
-      assert Usage.card([@entry, second]) |> String.split("\n") |> hd() ==
-               "2 requests · 22:15:58 – 22:16:07 UTC"
+      assert Usage.card([@entry, second]) |> String.split("\n") |> hd() == "2 requests"
     end
 
     test "counts missing counters as zero" do