diff --git a/lib/parrhesia/storage/adapters/memory/admin.ex b/lib/parrhesia/storage/adapters/memory/admin.ex
index 8309ddb..496ff89 100644
--- a/lib/parrhesia/storage/adapters/memory/admin.ex
+++ b/lib/parrhesia/storage/adapters/memory/admin.ex
@@ -6,6 +6,9 @@ defmodule Parrhesia.Storage.Adapters.Memory.Admin do
   alias Parrhesia.Storage.Adapters.Memory.Store
 
   @behaviour Parrhesia.Storage.Admin
+  @default_limit 100
+  @max_limit 1_000
+  @max_audit_logs 1_000
 
   @impl true
   def execute(_context, method, _params) do
@@ -17,18 +20,59 @@ defmodule Parrhesia.Storage.Adapters.Memory.Admin do
 
   @impl true
   def append_audit_log(_context, audit_entry) when is_map(audit_entry) do
-    Store.update(fn state -> update_in(state.audit_logs, &[audit_entry | &1]) end)
+    Store.update(fn state ->
+      update_in(state.audit_logs, fn logs ->
+        [audit_entry | logs] |> Enum.take(@max_audit_logs)
+      end)
+    end)
+
     :ok
   end
 
   def append_audit_log(_context, _audit_entry), do: {:error, :invalid_audit_entry}
 
   @impl true
-  def list_audit_logs(_context, _opts) do
-    {:ok, Store.get(fn state -> Enum.reverse(state.audit_logs) end)}
+  def list_audit_logs(_context, opts) when is_list(opts) do
+    limit = normalize_limit(Keyword.get(opts, :limit, @default_limit))
+    method = normalize_method_filter(Keyword.get(opts, :method))
+    actor_pubkey = Keyword.get(opts, :actor_pubkey)
+
+    logs =
+      Store.get(fn state ->
+        state.audit_logs
+        |> Enum.filter(&matches_filters?(&1, method, actor_pubkey))
+        |> Enum.take(limit)
+      end)
+
+    {:ok, logs}
   end
 
+  def list_audit_logs(_context, _opts), do: {:error, :invalid_opts}
+
   defp normalize_method(method) when is_binary(method), do: method
   defp normalize_method(method) when is_atom(method), do: Atom.to_string(method)
   defp normalize_method(method), do: inspect(method)
+
+  defp normalize_limit(limit) when is_integer(limit) and limit > 0, do: min(limit, @max_limit)
+  defp normalize_limit(_limit), do: @default_limit
+
+  defp normalize_method_filter(nil), do: nil
+  defp normalize_method_filter(method), do: normalize_method(method)
+
+  defp matches_method?(_entry, nil), do: true
+
+  defp matches_method?(entry, method) do
+    normalize_method(Map.get(entry, :method) || Map.get(entry, "method")) == method
+  end
+
+  defp matches_actor_pubkey?(_entry, nil), do: true
+
+  defp matches_actor_pubkey?(entry, actor_pubkey) do
+    Map.get(entry, :actor_pubkey) == actor_pubkey or
+      Map.get(entry, "actor_pubkey") == actor_pubkey
+  end
+
+  defp matches_filters?(entry, method, actor_pubkey) do
+    matches_method?(entry, method) and matches_actor_pubkey?(entry, actor_pubkey)
+  end
 end
diff --git a/lib/parrhesia/storage/adapters/memory/events.ex b/lib/parrhesia/storage/adapters/memory/events.ex
index 17eb3dc..b2b5a01 100644
--- a/lib/parrhesia/storage/adapters/memory/events.ex
+++ b/lib/parrhesia/storage/adapters/memory/events.ex
@@ -47,25 +47,19 @@ defmodule Parrhesia.Storage.Adapters.Memory.Events do
   def query_event_refs(_context, filters, opts) do
     with :ok <- Filter.validate_filters(filters) do
       requester_pubkeys = Keyword.get(opts, :requester_pubkeys, [])
+      query_opts = Keyword.put(opts, :apply_filter_limits?, false)
+
+      {_, refs} =
+        reduce_unique_matching_events(
+          filters,
+          requester_pubkeys,
+          query_opts,
+          {MapSet.new(), []},
+          &append_unique_event_ref/2
+        )
 
       refs =
-        filters
-        |> Enum.flat_map(
-          &matching_events_for_filter(
-            &1,
-            requester_pubkeys,
-            Keyword.put(opts, :apply_filter_limits?, false)
-          )
-        )
-        |> deduplicate_events()
-        |> Enum.map(fn event ->
-          %{
-            created_at: Map.fetch!(event, "created_at"),
-            id: Base.decode16!(Map.fetch!(event, "id"), case: :mixed)
-          }
-        end)
-        |> Enum.sort(&(compare_event_refs(&1, &2) != :gt))
-        |> maybe_limit_event_refs(opts)
+        refs |> Enum.sort(&(compare_event_refs(&1, &2) != :gt)) |> maybe_limit_event_refs(opts)
 
       {:ok, refs}
     end
@@ -75,18 +69,16 @@ defmodule Parrhesia.Storage.Adapters.Memory.Events do
   def count(_context, filters, opts) do
     with :ok <- Filter.validate_filters(filters) do
       requester_pubkeys = Keyword.get(opts, :requester_pubkeys, [])
+      query_opts = Keyword.put(opts, :apply_filter_limits?, false)
 
-      count =
-        filters
-        |> Enum.flat_map(
-          &matching_events_for_filter(
-            &1,
-            requester_pubkeys,
-            Keyword.put(opts, :apply_filter_limits?, false)
-          )
+      {_seen_ids, count} =
+        reduce_unique_matching_events(
+          filters,
+          requester_pubkeys,
+          query_opts,
+          {MapSet.new(), 0},
+          &count_unique_event/2
         )
-        |> deduplicate_events()
-        |> length()
 
       {:ok, count}
     end
@@ -119,13 +111,10 @@ defmodule Parrhesia.Storage.Adapters.Memory.Events do
       end)
 
     coordinate_delete_ids =
-      Store.reduce_events([], fn candidate, acc ->
-        if matches_delete_coordinate?(candidate, delete_coordinates, deleter_pubkey) do
-          [candidate["id"] | acc]
-        else
-          acc
-        end
-      end)
+      delete_coordinates
+      |> coordinate_delete_candidates(deleter_pubkey)
+      |> Enum.filter(&matches_delete_coordinate?(&1, delete_coordinates, deleter_pubkey))
+      |> Enum.map(& &1["id"])
 
     all_delete_ids = Enum.uniq(delete_event_ids ++ coordinate_delete_ids)
 
@@ -139,13 +128,9 @@ defmodule Parrhesia.Storage.Adapters.Memory.Events do
     pubkey = Map.get(event, "pubkey")
 
     deleted_ids =
-      Store.reduce_events([], fn candidate, acc ->
-        if candidate["pubkey"] == pubkey do
-          [candidate["id"] | acc]
-        else
-          acc
-        end
-      end)
+      pubkey
+      |> vanish_candidates(Map.get(event, "created_at"))
+      |> Enum.map(& &1["id"])
 
     Enum.each(deleted_ids, &Store.mark_deleted/1)
 
@@ -234,7 +219,7 @@ defmodule Parrhesia.Storage.Adapters.Memory.Events do
       Map.has_key?(filter, "ids") ->
         direct_id_lookup_events(filter, requester_pubkeys, opts)
 
-      is_tuple(indexed_tag_filter(filter)) ->
+      indexed_candidate_spec(filter) != nil ->
         indexed_tag_lookup_events(filter, requester_pubkeys, opts)
 
       true ->
@@ -273,11 +258,8 @@ defmodule Parrhesia.Storage.Adapters.Memory.Events do
   end
 
   defp indexed_tag_lookup_events(filter, requester_pubkeys, opts) do
-    {tag_name, tag_values} = indexed_tag_filter(filter)
-    indexed_tag_values = effective_indexed_tag_values(filter, tag_values)
-
-    tag_name
-    |> Store.tagged_events(indexed_tag_values)
+    filter
+    |> indexed_candidate_events()
     |> Enum.filter(&filter_match_visible?(&1, filter, requester_pubkeys))
     |> maybe_take_filter_limit(filter, opts)
   end
@@ -296,6 +278,49 @@ defmodule Parrhesia.Storage.Adapters.Memory.Events do
     end
   end
 
+  defp indexed_candidate_spec(filter) do
+    authors = Map.get(filter, "authors")
+    kinds = Map.get(filter, "kinds")
+    tag_filter = indexed_tag_filter(filter)
+
+    cond do
+      is_tuple(tag_filter) ->
+        {tag_name, tag_values} = tag_filter
+        {:tag, tag_name, effective_indexed_tag_values(filter, tag_values)}
+
+      is_list(authors) and is_list(kinds) ->
+        {:pubkey_kind, authors, kinds}
+
+      is_list(authors) ->
+        {:pubkey, authors}
+
+      is_list(kinds) ->
+        {:kind, kinds}
+
+      true ->
+        nil
+    end
+  end
+
+  defp indexed_candidate_events(filter) do
+    case indexed_candidate_spec(filter) do
+      {:tag, tag_name, tag_values} ->
+        Store.tagged_events(tag_name, tag_values)
+
+      {:pubkey_kind, authors, kinds} ->
+        Store.events_by_pubkeys_and_kinds(authors, kinds)
+
+      {:pubkey, authors} ->
+        Store.events_by_pubkeys(authors)
+
+      {:kind, kinds} ->
+        Store.events_by_kinds(kinds)
+
+      nil ->
+        []
+    end
+  end
+
   defp effective_indexed_tag_values(filter, tag_values) do
     case Map.get(filter, "limit") do
       limit when is_integer(limit) and limit == 1 ->
@@ -339,6 +364,114 @@ defmodule Parrhesia.Storage.Adapters.Memory.Events do
 
   defp maybe_halt_scan(acc, count, _limit), do: {acc, count}
 
+  defp reduce_unique_matching_events(filters, requester_pubkeys, opts, acc, reducer) do
+    Enum.reduce(filters, acc, fn filter, current_acc ->
+      reduce_matching_events_for_filter(filter, requester_pubkeys, opts, current_acc, reducer)
+    end)
+  end
+
+  defp reduce_matching_events_for_filter(filter, requester_pubkeys, _opts, acc, reducer) do
+    cond do
+      Map.has_key?(filter, "ids") ->
+        filter
+        |> Map.get("ids", [])
+        |> Enum.reduce(acc, &reduce_event_id_match(&1, filter, requester_pubkeys, &2, reducer))
+
+      indexed_candidate_spec(filter) != nil ->
+        filter
+        |> indexed_candidate_events()
+        |> Enum.reduce(
+          acc,
+          &maybe_reduce_visible_event(&1, filter, requester_pubkeys, &2, reducer)
+        )
+
+      true ->
+        Store.reduce_events_newest(
+          acc,
+          &maybe_reduce_visible_event(&1, filter, requester_pubkeys, &2, reducer)
+        )
+    end
+  end
+
+  defp coordinate_delete_candidates(delete_coordinates, deleter_pubkey) do
+    delete_coordinates
+    |> Enum.flat_map(fn coordinate ->
+      cond do
+        coordinate.pubkey != deleter_pubkey ->
+          []
+
+        addressable_kind?(coordinate.kind) ->
+          Store.events_by_addresses([{coordinate.kind, deleter_pubkey, coordinate.d_tag}])
+
+        replaceable_kind?(coordinate.kind) ->
+          Store.events_by_pubkeys_and_kinds([deleter_pubkey], [coordinate.kind])
+
+        true ->
+          []
+      end
+    end)
+    |> deduplicate_events()
+  end
+
+  defp vanish_candidates(pubkey, created_at) do
+    own_events =
+      Store.events_by_pubkeys([pubkey])
+      |> Enum.filter(&(&1["created_at"] <= created_at))
+
+    giftwrap_events =
+      Store.tagged_events("p", [pubkey])
+      |> Enum.filter(&(&1["kind"] == 1059 and &1["created_at"] <= created_at))
+
+    deduplicate_events(own_events ++ giftwrap_events)
+  end
+
+  defp event_ref(event) do
+    %{
+      created_at: Map.fetch!(event, "created_at"),
+      id: Base.decode16!(Map.fetch!(event, "id"), case: :mixed)
+    }
+  end
+
+  defp append_unique_event_ref(event, {seen_ids, acc}) do
+    reduce_unique_event(event, {seen_ids, acc}, fn _event_id, next_seen_ids ->
+      {next_seen_ids, [event_ref(event) | acc]}
+    end)
+  end
+
+  defp count_unique_event(event, {seen_ids, acc}) do
+    reduce_unique_event(event, {seen_ids, acc}, fn _event_id, next_seen_ids ->
+      {next_seen_ids, acc + 1}
+    end)
+  end
+
+  defp reduce_unique_event(event, {seen_ids, acc}, fun) do
+    event_id = Map.fetch!(event, "id")
+
+    if MapSet.member?(seen_ids, event_id) do
+      {seen_ids, acc}
+    else
+      fun.(event_id, MapSet.put(seen_ids, event_id))
+    end
+  end
+
+  defp maybe_reduce_visible_event(event, filter, requester_pubkeys, acc, reducer) do
+    if filter_match_visible?(event, filter, requester_pubkeys) do
+      reducer.(event, acc)
+    else
+      acc
+    end
+  end
+
+  defp reduce_event_id_match(event_id, filter, requester_pubkeys, acc, reducer) do
+    case Store.get_event(event_id) do
+      {:ok, event, false} ->
+        maybe_reduce_visible_event(event, filter, requester_pubkeys, acc, reducer)
+
+      _other ->
+        acc
+    end
+  end
+
   defp deduplicate_events(events) do
     events
     |> Enum.reduce(%{}, fn event, acc -> Map.put(acc, event["id"], event) end)
diff --git a/lib/parrhesia/storage/adapters/memory/store.ex b/lib/parrhesia/storage/adapters/memory/store.ex
index a325846..f0cc921 100644
--- a/lib/parrhesia/storage/adapters/memory/store.ex
+++ b/lib/parrhesia/storage/adapters/memory/store.ex
@@ -7,6 +7,10 @@ defmodule Parrhesia.Storage.Adapters.Memory.Store do
   @events_table :parrhesia_memory_events
   @events_by_time_table :parrhesia_memory_events_by_time
   @events_by_tag_table :parrhesia_memory_events_by_tag
+  @events_by_pubkey_table :parrhesia_memory_events_by_pubkey
+  @events_by_kind_table :parrhesia_memory_events_by_kind
+  @events_by_pubkey_kind_table :parrhesia_memory_events_by_pubkey_kind
+  @events_by_address_table :parrhesia_memory_events_by_address
 
   @initial_state %{
     bans: %{pubkeys: MapSet.new(), events: MapSet.new(), ips: MapSet.new()},
@@ -19,7 +23,14 @@ defmodule Parrhesia.Storage.Adapters.Memory.Store do
   }
 
   def ensure_started do
-    ensure_agent_started()
+    with :ok <- ensure_agent_started() do
+      Agent.get(@name, fn state ->
+        ensure_tables_started()
+        state
+      end)
+
+      :ok
+    end
   end
 
   def put_event(event_id, event) when is_binary(event_id) and is_map(event) do
@@ -28,6 +39,7 @@ defmodule Parrhesia.Storage.Adapters.Memory.Store do
     if :ets.insert_new(@events_table, {event_id, event, false}) do
       true = :ets.insert(@events_by_time_table, {{sort_key(event), event_id}, event_id})
       index_event_tags(event_id, event)
+      index_event_secondary_keys(event_id, event)
       :ok
     else
       {:error, :duplicate_event}
@@ -51,6 +63,7 @@ defmodule Parrhesia.Storage.Adapters.Memory.Store do
         true = :ets.insert(@events_table, {event_id, event, true})
         true = :ets.delete(@events_by_time_table, {sort_key(event), event_id})
         unindex_event_tags(event_id, event)
+        unindex_event_secondary_keys(event_id, event)
         :ok
 
       {:ok, _event, true} ->
@@ -86,9 +99,43 @@ defmodule Parrhesia.Storage.Adapters.Memory.Store do
     :ok = ensure_started()
 
     tag_values
-    |> Enum.flat_map(&tagged_events_for_value(tag_name, &1))
-    |> Enum.uniq_by(& &1["id"])
-    |> Enum.sort(&chronological_sorter/2)
+    |> Enum.flat_map(&indexed_events_for_value(@events_by_tag_table, {tag_name, &1}))
+    |> sort_and_deduplicate_events()
+  end
+
+  def events_by_pubkeys(pubkeys) when is_list(pubkeys) do
+    :ok = ensure_started()
+
+    pubkeys
+    |> Enum.flat_map(&indexed_events_for_value(@events_by_pubkey_table, &1))
+    |> sort_and_deduplicate_events()
+  end
+
+  def events_by_kinds(kinds) when is_list(kinds) do
+    :ok = ensure_started()
+
+    kinds
+    |> Enum.flat_map(&indexed_events_for_value(@events_by_kind_table, &1))
+    |> sort_and_deduplicate_events()
+  end
+
+  def events_by_pubkeys_and_kinds(pubkeys, kinds) when is_list(pubkeys) and is_list(kinds) do
+    :ok = ensure_started()
+
+    pubkeys
+    |> Enum.flat_map(fn pubkey ->
+      kinds
+      |> Enum.flat_map(&indexed_events_for_value(@events_by_pubkey_kind_table, {pubkey, &1}))
+    end)
+    |> sort_and_deduplicate_events()
+  end
+
+  def events_by_addresses(addresses) when is_list(addresses) do
+    :ok = ensure_started()
+
+    addresses
+    |> Enum.flat_map(&indexed_events_for_value(@events_by_address_table, &1))
+    |> sort_and_deduplicate_events()
   end
 
   defp reduce_events_newest_from(:"$end_of_table", acc, _fun), do: acc
@@ -152,7 +199,13 @@ defmodule Parrhesia.Storage.Adapters.Memory.Store do
   end
 
   defp init_state do
-    :ets.new(@events_table, [
+    ensure_tables_started()
+
+    @initial_state
+  end
+
+  defp ensure_tables_started do
+    ensure_table(@events_table, [
       :named_table,
       :public,
       :set,
@@ -160,7 +213,7 @@ defmodule Parrhesia.Storage.Adapters.Memory.Store do
       write_concurrency: true
     ])
 
-    :ets.new(@events_by_time_table, [
+    ensure_table(@events_by_time_table, [
       :named_table,
       :public,
       :ordered_set,
@@ -168,7 +221,7 @@ defmodule Parrhesia.Storage.Adapters.Memory.Store do
       write_concurrency: true
     ])
 
-    :ets.new(@events_by_tag_table, [
+    ensure_table(@events_by_tag_table, [
       :named_table,
       :public,
       :bag,
@@ -176,7 +229,44 @@ defmodule Parrhesia.Storage.Adapters.Memory.Store do
       write_concurrency: true
     ])
 
-    @initial_state
+    ensure_table(@events_by_pubkey_table, [
+      :named_table,
+      :public,
+      :bag,
+      read_concurrency: true,
+      write_concurrency: true
+    ])
+
+    ensure_table(@events_by_kind_table, [
+      :named_table,
+      :public,
+      :bag,
+      read_concurrency: true,
+      write_concurrency: true
+    ])
+
+    ensure_table(@events_by_pubkey_kind_table, [
+      :named_table,
+      :public,
+      :bag,
+      read_concurrency: true,
+      write_concurrency: true
+    ])
+
+    ensure_table(@events_by_address_table, [
+      :named_table,
+      :public,
+      :bag,
+      read_concurrency: true,
+      write_concurrency: true
+    ])
+  end
+
+  defp ensure_table(name, options) do
+    case :ets.whereis(name) do
+      :undefined -> :ets.new(name, options)
+      _table -> :ok
+    end
   end
 
   defp lookup_event(event_id) do
@@ -186,21 +276,6 @@ defmodule Parrhesia.Storage.Adapters.Memory.Store do
     end
   end
 
-  defp tagged_events_for_value(_tag_name, tag_value) when not is_binary(tag_value), do: []
-
-  defp tagged_events_for_value(tag_name, tag_value) do
-    tag_key = {tag_name, tag_value}
-
-    @events_by_tag_table
-    |> :ets.lookup(tag_key)
-    |> Enum.reduce([], fn {^tag_key, _created_sort_key, event_id}, acc ->
-      case lookup_event(event_id) do
-        {:ok, event, false} -> [event | acc]
-        _other -> acc
-      end
-    end)
-  end
-
   defp index_event_tags(event_id, event) do
     event
     |> event_tag_index_entries(event_id)
@@ -209,12 +284,28 @@ defmodule Parrhesia.Storage.Adapters.Memory.Store do
     end)
   end
 
+  defp index_event_secondary_keys(event_id, event) do
+    event
+    |> secondary_index_entries(event_id)
+    |> Enum.each(fn {table, entry} ->
+      true = :ets.insert(table, entry)
+    end)
+  end
+
   defp unindex_event_tags(event_id, event) do
     event
     |> event_tag_index_entries(event_id)
     |> Enum.each(&:ets.delete_object(@events_by_tag_table, &1))
   end
 
+  defp unindex_event_secondary_keys(event_id, event) do
+    event
+    |> secondary_index_entries(event_id)
+    |> Enum.each(fn {table, entry} ->
+      :ets.delete_object(table, entry)
+    end)
+  end
+
   defp event_tag_index_entries(event, event_id) do
     created_sort_key = sort_key(event)
 
@@ -229,6 +320,70 @@ defmodule Parrhesia.Storage.Adapters.Memory.Store do
     end)
   end
 
+  defp secondary_index_entries(event, event_id) do
+    created_sort_key = sort_key(event)
+    pubkey = Map.get(event, "pubkey")
+    kind = Map.get(event, "kind")
+
+    []
+    |> maybe_put_secondary_entry(@events_by_pubkey_table, pubkey, created_sort_key, event_id)
+    |> maybe_put_secondary_entry(@events_by_kind_table, kind, created_sort_key, event_id)
+    |> maybe_put_pubkey_kind_entry(pubkey, kind, created_sort_key, event_id)
+    |> maybe_put_address_entry(event, pubkey, kind, event_id)
+  end
+
+  defp maybe_put_secondary_entry(entries, _table, key, _created_sort_key, _event_id)
+       when is_nil(key),
+       do: entries
+
+  defp maybe_put_secondary_entry(entries, table, key, created_sort_key, event_id) do
+    [{table, {key, created_sort_key, event_id}} | entries]
+  end
+
+  defp maybe_put_pubkey_kind_entry(entries, pubkey, kind, created_sort_key, event_id)
+       when is_binary(pubkey) and is_integer(kind) do
+    [{@events_by_pubkey_kind_table, {{pubkey, kind}, created_sort_key, event_id}} | entries]
+  end
+
+  defp maybe_put_pubkey_kind_entry(entries, _pubkey, _kind, _created_sort_key, _event_id),
+    do: entries
+
+  defp maybe_put_address_entry(entries, event, pubkey, kind, event_id)
+       when is_binary(pubkey) and is_integer(kind) and kind >= 30_000 and kind < 40_000 do
+    d_tag =
+      event
+      |> Map.get("tags", [])
+      |> Enum.find_value("", fn
+        ["d", value | _rest] -> value
+        _tag -> nil
+      end)
+
+    [{@events_by_address_table, {{kind, pubkey, d_tag}, sort_key(event), event_id}} | entries]
+  end
+
+  defp maybe_put_address_entry(entries, _event, _pubkey, _kind, _event_id), do: entries
+
+  defp indexed_events_for_value(_table, value)
+       when not is_binary(value) and not is_integer(value) and not is_tuple(value),
+       do: []
+
+  defp indexed_events_for_value(table, value) do
+    table
+    |> :ets.lookup(value)
+    |> Enum.reduce([], fn {^value, _created_sort_key, event_id}, acc ->
+      case lookup_event(event_id) do
+        {:ok, event, false} -> [event | acc]
+        _other -> acc
+      end
+    end)
+  end
+
+  defp sort_and_deduplicate_events(events) do
+    events
+    |> Enum.uniq_by(& &1["id"])
+    |> Enum.sort(&chronological_sorter/2)
+  end
+
   defp chronological_sorter(left, right) do
     cond do
       left["created_at"] > right["created_at"] -> true
diff --git a/test/parrhesia/storage/adapters/memory/adapter_test.exs b/test/parrhesia/storage/adapters/memory/adapter_test.exs
index 0be68a1..27bbce7 100644
--- a/test/parrhesia/storage/adapters/memory/adapter_test.exs
+++ b/test/parrhesia/storage/adapters/memory/adapter_test.exs
@@ -179,4 +179,127 @@ defmodule Parrhesia.Storage.Adapters.Memory.AdapterTest do
 
     assert Enum.map(results, & &1["id"]) == [newest["id"], middle["id"]]
   end
+
+  test "memory adapter counts and returns refs without duplicate overlaps across indexed filters" do
+    author = String.duplicate("9", 64)
+    tag = "shared"
+
+    older =
+      %{
+        "id" => String.duplicate("a", 64),
+        "pubkey" => author,
+        "created_at" => 1_700_000_200,
+        "kind" => 1,
+        "tags" => [["t", tag]],
+        "content" => "older"
+      }
+
+    newer =
+      %{
+        "id" => String.duplicate("b", 64),
+        "pubkey" => author,
+        "created_at" => 1_700_000_201,
+        "kind" => 1,
+        "tags" => [["t", tag]],
+        "content" => "newer"
+      }
+
+    unrelated =
+      %{
+        "id" => String.duplicate("c", 64),
+        "pubkey" => String.duplicate("d", 64),
+        "created_at" => 1_700_000_202,
+        "kind" => 2,
+        "tags" => [["t", "other"]],
+        "content" => "unrelated"
+      }
+
+    assert {:ok, _event} = Events.put_event(%{}, older)
+    assert {:ok, _event} = Events.put_event(%{}, newer)
+    assert {:ok, _event} = Events.put_event(%{}, unrelated)
+
+    filters = [
+      %{"authors" => [author], "kinds" => [1]},
+      %{"#t" => [tag]}
+    ]
+
+    assert {:ok, 2} = Events.count(%{}, filters, [])
+
+    assert {:ok, refs} = Events.query_event_refs(%{}, filters, [])
+
+    assert Enum.map(refs, &Base.encode16(&1.id, case: :lower)) == [older["id"], newer["id"]]
+  end
+
+  test "memory adapter uses indexes for vanish and keeps unrelated events" do
+    author = String.duplicate("e", 64)
+    other = String.duplicate("f", 64)
+
+    own_event =
+      %{
+        "id" => String.duplicate("1", 64),
+        "pubkey" => author,
+        "created_at" => 1_700_000_300,
+        "kind" => 1,
+        "tags" => [],
+        "content" => "own-event"
+      }
+
+    giftwrap_event =
+      %{
+        "id" => String.duplicate("2", 64),
+        "pubkey" => other,
+        "created_at" => 1_700_000_301,
+        "kind" => 1059,
+        "tags" => [["p", author]],
+        "content" => "giftwrap"
+      }
+
+    other_event =
+      %{
+        "id" => String.duplicate("3", 64),
+        "pubkey" => other,
+        "created_at" => 1_700_000_302,
+        "kind" => 1,
+        "tags" => [],
+        "content" => "other"
+      }
+
+    assert {:ok, _event} = Events.put_event(%{}, own_event)
+    assert {:ok, _event} = Events.put_event(%{}, giftwrap_event)
+    assert {:ok, _event} = Events.put_event(%{}, other_event)
+
+    assert {:ok, 2} =
+             Events.vanish(%{}, %{"pubkey" => author, "created_at" => 1_700_000_400})
+
+    assert {:ok, nil} = Events.get_event(%{}, own_event["id"])
+    assert {:ok, nil} = Events.get_event(%{}, giftwrap_event["id"])
+    assert {:ok, remaining} = Events.get_event(%{}, other_event["id"])
+    assert remaining["id"] == other_event["id"]
+  end
+
+  test "memory admin keeps a bounded newest-first audit log" do
+    Enum.each(1..1_005, fn index ->
+      assert :ok =
+               Admin.append_audit_log(%{}, %{
+                 method: if(rem(index, 2) == 0, do: "stats", else: "ping"),
+                 actor_pubkey: if(rem(index, 3) == 0, do: "actor-a", else: "actor-b"),
+                 params: %{index: index}
+               })
+    end)
+
+    assert {:ok, latest_logs} = Admin.list_audit_logs(%{}, limit: 3)
+    assert length(latest_logs) == 3
+    assert Enum.map(latest_logs, & &1.params.index) == [1005, 1004, 1003]
+
+    assert {:ok, actor_logs} = Admin.list_audit_logs(%{}, actor_pubkey: "actor-a", limit: 2)
+    assert Enum.all?(actor_logs, &(&1.actor_pubkey == "actor-a"))
+
+    assert {:ok, stats_logs} = Admin.list_audit_logs(%{}, method: :stats, limit: 2)
+    assert Enum.all?(stats_logs, &(&1.method == "stats"))
+
+    assert {:ok, retained_logs} = Admin.list_audit_logs(%{}, limit: 2_000)
+    assert length(retained_logs) == 1_000
+    assert Enum.any?(retained_logs, &(&1.params.index == 1005))
+    refute Enum.any?(retained_logs, &(&1.params.index == 1))
+  end
 end