Working follow and unfollow interactions for users

priv/repo/migrations/20260403012654_follow_feature.exs

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+defmodule Mixer.Repo.Migrations.FollowFeature do
+  @moduledoc """
+  Updates resources based on their most recent snapshots.
+
+  This file was autogenerated with `mix ash_postgres.generate_migrations`
+  """
+
+  use Ecto.Migration
+
+  def up do
+    create table(:follows, primary_key: false) do
+      add :id, :uuid, null: false, default: fragment("gen_random_uuid()"), primary_key: true
+
+      add :created_at, :utc_datetime_usec,
+        null: false,
+        default: fragment("(now() AT TIME ZONE 'utc')")
+
+      add :follower_id,
+          references(:users,
+            column: :id,
+            name: "follows_follower_id_fkey",
+            type: :uuid,
+            prefix: "public",
+            on_delete: :delete_all
+          ), primary_key: true, null: false
+
+      add :following_id,
+          references(:users,
+            column: :id,
+            name: "follows_following_id_fkey",
+            type: :uuid,
+            prefix: "public",
+            on_delete: :delete_all
+          ), primary_key: true, null: false
+    end
+
+    create unique_index(:follows, [:follower_id, :following_id],
+             name: "follows_unique_follow_index"
+           )
+  end
+
+  def down do
+    drop_if_exists unique_index(:follows, [:follower_id, :following_id],
+                     name: "follows_unique_follow_index"
+                   )
+
+    drop constraint(:follows, "follows_follower_id_fkey")
+
+    drop constraint(:follows, "follows_following_id_fkey")
+
+    drop table(:follows)
+  end
+end