Fix last oracle chain loaded in mem table loader init

lib/archethic/oracle_chain/mem_table_loader.ex

@@ -1,6 +1,9 @@
 defmodule Archethic.OracleChain.MemTableLoader do
   @moduledoc false
 
+  alias Archethic.Crypto
+
+  alias Archethic.OracleChain
   alias Archethic.OracleChain.MemTable
 
   alias Archethic.TransactionChain
@@ -17,15 +20,31 @@ defmodule Archethic.OracleChain.MemTableLoader do
   end
 
   def init(_) do
-    TransactionChain.list_transactions_by_type(:oracle_summary, [
-      :address,
-      :type,
-      data: [:content],
-      validation_stamp: [:timestamp]
-    ])
-    |> Stream.each(&load_transaction(&1, true))
+    transactions_stream =
+      TransactionChain.list_transactions_by_type(:oracle_summary, [
+        :address,
+        :type,
+        data: [:content],
+        validation_stamp: [:timestamp]
+      ])
+
+    Stream.each(transactions_stream, &load_transaction(&1, true))
     |> Stream.run()
 
+    # Load last oracle chain from db
+    case Enum.take(transactions_stream, -1) do
+      [] ->
+        :ignore
+
+      [%Transaction{validation_stamp: %ValidationStamp{timestamp: last_summary_timestamp}}] ->
+        OracleChain.next_summary_date(last_summary_timestamp)
+        |> Crypto.derive_oracle_address(0)
+        |> TransactionChain.get_last_address()
+        |> elem(0)
+        |> get_chain()
+        |> Enum.each(&load_transaction(&1, true))
+    end
+
     {:ok, []}
   end
 
@@ -87,4 +106,18 @@ defmodule Archethic.OracleChain.MemTableLoader do
       end)
     end)
   end
+
+  defp get_chain(address, opts \\ [], acc \\ []) do
+    case TransactionChain.get(
+           address,
+           [:address, :type, data: [:content], validation_stamp: [:timestamp]],
+           opts
+         ) do
+      {transactions, false, _paging_state} ->
+        acc ++ transactions
+
+      {transactions, true, paging_state} ->
+        get_chain(address, [paging_state: paging_state], acc ++ transactions)
+    end
+  end
 end