Preserva drain/offline su home e genera slate offline nel cloud-init.

Evita che ensure_home_from_env! annulli il drain a ogni allocate, e prepara /slates/offline.mp4 sul nodo Cloud per create_path MediaMTX.

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

backend/app/services/streams/node_registry.rb

@@ -11,10 +11,9 @@ module Streams
     class << self
       def ensure_home_from_env!
         StreamNode.find_or_initialize_by(slug: HOME_SLUG).tap do |node|
-          node.assign_attributes(
+          attrs = {
             hostname: home_hostname,
             role: "home",
-            status: "ready",
             provider: "local",
             rtmp_base_url: MatchLiveTv.mediamtx_rtmp_url,
             hls_base_url: MatchLiveTv.hls_public_url,
@@ -23,7 +22,10 @@ module Streams
             internal_hls_url: ENV.fetch("MEDIAMTX_HLS_URL", "http://mediamtx:8888"),
             max_publishers: ENV.fetch("STREAM_NODE_HOME_MAX_PUBLISHERS", "6").to_i,
             max_relays: ENV.fetch("STREAM_NODE_HOME_MAX_RELAYS", "6").to_i
-          )
+          }
+          # Non sovrascrivere drain/offline/error (ops) a ogni allocate!
+          attrs[:status] = "ready" if node.new_record? || !%w[draining offline error].include?(node.status)
+          node.assign_attributes(attrs)
           node.save!
         end
       end

backend/spec/services/streams/node_registry_spec.rb

@@ -39,6 +39,16 @@ RSpec.describe Streams::NodeRegistry do
     end
   end
 
+  it "does not reset home drain/offline/error status on ensure" do
+    with_env(home_env) do
+      home = described_class.ensure_home_from_env!
+      home.update!(status: "draining")
+
+      expect(described_class.ensure_home_from_env!.status).to eq("draining")
+      expect { described_class.allocate! }.to raise_error(Streams::NodeRegistry::NoCapacityError)
+    end
+  end
+
   it "allocates the least loaded ready node" do
     with_env(home_env) do
       home = described_class.ensure_home_from_env!

infra/stream-node/cloud-init.yaml

@@ -48,6 +48,12 @@ write_files:
       done
       docker pull bluenviron/mediamtx:latest
       docker rm -f mediamtx 2>/dev/null || true
+      # Slate offline (alwaysAvailable) — richiesta da Mediamtx::Client#create_path
+      mkdir -p /slates
+      if [ ! -f /slates/offline.mp4 ]; then
+        ffmpeg -y -f lavfi -i color=c=black:s=1280x720:d=2 -f lavfi -i anullsrc=r=44100:cl=stereo \
+          -c:v libx264 -t 2 -pix_fmt yuv420p -c:a aac -shortest /slates/offline.mp4
+      fi
       # Debian cloud image: docker.io senza apparmor_parser → serve unconfined o pkg apparmor
       docker run -d --name mediamtx --restart unless-stopped --network host \
         --security-opt apparmor=unconfined \