revamp aggregate and use typestruct

priv/repo/migrations/20260310213733_create_car_policies.exs

@@ -20,22 +20,15 @@ defmodule PolicyService.Repo.Migrations.CreatePolicyApplications do
       add :selected_providers, {:array, :string}, default: []
       add :quotes, :map, default: %{}
 
-      # Accepted plan
-      add :accepted_quote_id, :string
-      add :accepted_plan_id, :string
-      add :accepted_provider_id, :string
-      add :accepted_by, :string
-      add :accepted_at, :utc_datetime_usec
+       # Accepted plan
+       add :accepted_plan_id, :string
+       add :accepted_by, :string
 
-      # Solicitation
-      add :solicitation_id, :string
-      add :solicitation_s3_key, :string
-
-      # Issued policy
-      add :policy_number, :string
-      add :premium, :decimal
-      add :effective_date, :date
-      add :expiry_date, :date
+       # Issued policy
+       add :provider_policy_number, :string
+       add :premium, :decimal
+       add :effective_date, :date
+       add :expiry_date, :date
 
       # Status + timestamps
       add :status, :string, null: false