Aggiunge replay YouTube temporaneo, pull registrazioni dai CPX e snapshot ingest in admin.

Così overflow Hetzner e VOD YouTube restano in archivio dopo lo spegnimento del nodo, e la colonna ingest non si svuota.

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/db/migrate/20260826193000_add_temporary_replay_fields_to_recordings.rb

@@ -0,0 +1,15 @@
+# frozen_string_literal: true
+
+class AddTemporaryReplayFieldsToRecordings < ActiveRecord::Migration[7.2]
+  def change
+    change_table :recordings, bulk: true do |t|
+      t.string :storage_policy, null: false, default: "retained"
+      t.datetime :temp_expires_at
+      t.datetime :youtube_verified_at
+      t.datetime :local_media_purged_at
+    end
+
+    add_index :recordings, %i[storage_policy temp_expires_at],
+              name: "index_recordings_on_storage_policy_and_temp_expires_at"
+  end
+end

backend/db/migrate/20260828124000_add_ingest_snapshot_to_stream_sessions.rb

@@ -0,0 +1,51 @@
+# frozen_string_literal: true
+
+class AddIngestSnapshotToStreamSessions < ActiveRecord::Migration[7.2]
+  def up
+    add_column :stream_sessions, :ingest_slug, :string
+    add_column :stream_sessions, :ingest_role, :string
+    add_index :stream_sessions, :ingest_slug
+
+    execute <<~SQL
+      UPDATE stream_sessions ss
+      SET ingest_slug = sn.slug,
+          ingest_role = sn.role
+      FROM stream_nodes sn
+      WHERE ss.stream_node_id = sn.id
+        AND ss.ingest_slug IS NULL
+    SQL
+
+    execute <<~SQL
+      UPDATE stream_sessions ss
+      SET ingest_slug = ev.slug
+      FROM (
+        SELECT DISTINCT ON (stream_session_id)
+          stream_session_id,
+          metadata->>'stream_node' AS slug
+        FROM stream_events
+        WHERE event_type = 'pairing'
+          AND COALESCE(metadata->>'stream_node', '') <> ''
+        ORDER BY stream_session_id, occurred_at ASC
+      ) ev
+      WHERE ss.id = ev.stream_session_id
+        AND ss.ingest_slug IS NULL
+    SQL
+
+    execute <<~SQL
+      UPDATE stream_sessions
+      SET ingest_role = CASE
+        WHEN ingest_slug = 'home' THEN 'home'
+        WHEN ingest_slug LIKE 'ingest-lab%' THEN 'lab'
+        WHEN ingest_slug LIKE 'ingest-%' THEN 'cloud'
+        ELSE ingest_role
+      END
+      WHERE ingest_slug IS NOT NULL AND ingest_role IS NULL
+    SQL
+  end
+
+  def down
+    remove_index :stream_sessions, :ingest_slug
+    remove_column :stream_sessions, :ingest_role
+    remove_column :stream_sessions, :ingest_slug
+  end
+end