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priv/repo/migrations/20241026212840_update_gists_code_type.exs

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+defmodule Zoeyscomputer.Repo.Migrations.UpdateGistsCodeType do
+  use Ecto.Migration
+
+  def change do
+    alter table(:gists) do
+      modify :code, :text
+    end
+  end
+end

priv/repo/migrations/20241026223550_add_gists_info.exs

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+defmodule Zoeyscomputer.Repo.Migrations.AddGistsInfo do
+  use Ecto.Migration
+
+  def change do
+    alter table(:gists) do
+      add :title, :string
+      add :desc, :text
+    end
+  end
+end

priv/repo/migrations/20241027003540_change_gists_id.exs

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+defmodule Zoeyscomputer.Repo.Migrations.ChangeGistsId do
+  alias Ecto.Repo
+  alias Zoeyscomputer.IdGenerator
+  use Ecto.Migration
+
+  import Ecto.Query, only: [from: 2]
+
+  def change do
+    alter table(:gists) do
+      add(:new_id, :string)
+    end
+
+    flush()
+
+    execute """
+    UPDATE gists SET new_id = substring(md5(random()::text), 0, 8)
+    """
+
+    alter table(:gists) do
+      remove(:id)
+      modify(:new_id, :string, primary_key: true)
+    end
+
+    rename(table(:gists), :new_id, to: :id)
+  end
+end

priv/repo/migrations/20241027005245_gists_author_field.exs

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+defmodule Zoeyscomputer.Repo.Migrations.GistsAuthorField do
+  use Ecto.Migration
+
+  def change do
+    alter table(:gists) do
+      add :author_id, references(:users, on_delete: :nothing)
+    end
+  end
+end