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

backend/app/models/stream_session.rb

@@ -10,6 +10,10 @@ class StreamSession < ApplicationRecord
   belongs_to :user
   belongs_to :stream_node, optional: true
   has_many :stream_events, dependent: :destroy
+  has_many :occupying_concurrency_violations, class_name: "StreamConcurrencyViolation",
+           foreign_key: :occupying_session_id, dependent: :nullify, inverse_of: :occupying_session
+  has_many :attempted_concurrency_violations, class_name: "StreamConcurrencyViolation",
+           foreign_key: :attempted_session_id, dependent: :nullify, inverse_of: :attempted_session
   has_one :score_state, dependent: :destroy
   has_one :recording
   has_many :device_states, dependent: :destroy
@@ -84,6 +88,35 @@ class StreamSession < ApplicationRecord
     stream_node&.role.presence || ingest_role
   end
 
+  def match_label
+    team_name = match&.team&.name
+    opponent = match&.opponent_name
+    return id.to_s if team_name.blank?
+
+    opponent.present? ? "#{team_name} vs #{opponent}" : team_name
+  end
+
+  def client_device_label
+    parts = []
+    parts << client_os if client_os.present?
+    device = [device_manufacturer, device_model].compact_blank.join(" ")
+    parts << device if device.present?
+    parts << "OS #{os_version}" if os_version.present?
+    parts.join(" · ").presence
+  end
+
+  def client_device_key
+    [client_os, device_manufacturer, device_model].map { |v| v.to_s.strip.downcase }.join("|")
+  end
+
+  def self.devices_differ?(left, right)
+    ka = left.client_device_key
+    kb = right.client_device_key
+    return false if ka.delete("|").blank? || kb.delete("|").blank?
+
+    ka != kb
+  end
+
   def rtmp_ingest_url
     # RootEncoder richiede rtmp://host:port/app/stream (due segmenti).
     # MediaMTX path = live/match_{uuid} (no ?token= nel path).