basic admin endgame view and add

priv/repo/migrations/20251105204020_create_tags.exs

@@ -0,0 +1,14 @@
+defmodule Chesstrainer.Repo.Migrations.CreateTags do
+  use Ecto.Migration
+
+  def change do
+    create table(:tags) do
+      add :name, :string
+      add :category, :string
+
+      timestamps(type: :utc_datetime)
+    end
+
+    create unique_index(:tags, [:name, :category])
+  end
+end

priv/repo/migrations/20251127164545_create_endgames.exs

@@ -0,0 +1,23 @@
+defmodule Chesstrainer.Repo.Migrations.CreateEndgames do
+  use Ecto.Migration
+
+  def change do
+    create table(:endgames, primary_key: false) do
+      add :id, :binary_id, primary_key: true
+      add :fen, :string
+      add :color, :string
+      add :key, :string
+      add :message, :text
+      add :notes, :text
+      add :result, :string
+      add :rating, :integer, default: 1500
+      add :rating_deviation, :integer, default: 350
+      add :times_attempted, :integer, default: 0
+      add :times_solved, :integer, default: 0
+
+      timestamps(type: :utc_datetime)
+    end
+
+    create unique_index(:endgames, [:fen])
+  end
+end

priv/repo/migrations/20251205210539_create_endgames_tags.exs

@@ -0,0 +1,12 @@
+defmodule Chesstrainer.Repo.Migrations.CreateEndgamesTags do
+  use Ecto.Migration
+
+  def change do
+    create table(:endgames_tags, primary_key: false) do
+      add :endgame_id, references(:endgames, type: :binary_id, on_delete: :delete_all)
+      add :tag_id, references(:tags, on_delete: :delete_all)
+    end
+
+    create unique_index(:endgames_tags, [:endgame_id, :tag_id])
+  end
+end