fix(auto-assignment): apply default 7 day age exclusion when inbox has no policy

app/models/assignment_policy.rb

@@ -22,6 +22,8 @@
 #  index_assignment_policies_on_enabled              (enabled)
 #
 class AssignmentPolicy < ApplicationRecord
+  DEFAULT_EXCLUDE_OLDER_THAN_HOURS = 168
+
   belongs_to :account
   has_many :inbox_assignment_policies, dependent: :destroy
   has_many :inboxes, through: :inbox_assignment_policies

app/services/auto_assignment/assignment_service.rb

@@ -35,9 +35,9 @@ class AutoAssignment::AssignmentService
   def unassigned_conversations(limit)
     scope = inbox.conversations.unassigned.open
 
-    # Skip stale backlog with no activity beyond the policy's age threshold (defaults to 7 days)
+    # Skip stale backlog with no activity beyond the age threshold
     policy = inbox.assignment_policy
-    scope = apply_age_exclusions(scope, policy&.exclude_older_than_hours)
+    scope = apply_age_exclusions(scope, age_exclusion_hours(policy))
 
     # Apply conversation priority using assignment policy if available
     scope = if policy&.longest_waiting?
@@ -49,6 +49,12 @@ class AutoAssignment::AssignmentService
     scope.limit(limit)
   end
 
+  def age_exclusion_hours(policy)
+    return policy.exclude_older_than_hours if policy
+
+    AssignmentPolicy::DEFAULT_EXCLUDE_OLDER_THAN_HOURS
+  end
+
   def apply_age_exclusions(scope, hours_threshold)
     return scope if hours_threshold.blank?
 

enterprise/app/services/enterprise/auto_assignment/assignment_service.rb

@@ -60,7 +60,7 @@ module Enterprise::AutoAssignment::AssignmentService
     scope = inbox.conversations.unassigned.open
 
     # First apply the assignment policy's age exclusion (defaults to 7 days)
-    scope = apply_age_exclusions(scope, policy&.exclude_older_than_hours)
+    scope = apply_age_exclusions(scope, age_exclusion_hours(policy))
 
     # Then apply the capacity policy's exclusion rules (labels and age)
     scope = apply_exclusion_rules(scope)