Improve primary keys usage

priv/repo/migrations/20210830160818_create_initial_tables.exs

@@ -11,9 +11,9 @@ defmodule Architex.Repo.Migrations.CreateInitialTables do
     create index(:accounts, [:localpart], unique: true)
 
     create table(:rooms, primary_key: false) do
+      add :id, :string, primary_key: true, null: false
       add :state, {:array, {:array, :string}}, default: [], null: false
       add :forward_extremities, {:array, :string}, default: [], null: false
-      add :id, :string, primary_key: true, null: false
       add :visibility, :string, null: false, default: "public"
     end
 
@@ -26,11 +26,13 @@ defmodule Architex.Repo.Migrations.CreateInitialTables do
     end
 
     create table(:events, primary_key: false) do
+      add :nid, :serial, primary_key: true
+
       add :origin_server_ts, :bigint, null: false
       add :unsigned, :map, default: %{}, null: true
       add :hashes, :map, null: false
       add :signatures, :map, null: false
-      add :event_id, :string, null: false
+      add :id, :string, null: false
       add :content, :map
       add :type, :string, null: false
       add :state_key, :string
@@ -40,6 +42,8 @@ defmodule Architex.Repo.Migrations.CreateInitialTables do
       add :room_id, references(:rooms, type: :string), null: false
     end
 
+    create index(:events, [:id], unique: true)
+
     create table(:server_key_info, primary_key: false) do
       add :valid_until, :bigint, default: 0, null: false
       add :server_name, :string, primary_key: true, null: false
@@ -61,21 +65,22 @@ defmodule Architex.Repo.Migrations.CreateInitialTables do
 
     create index(:aliases, [:room_id])
 
-    create table(:devices) do
-      add :device_id, :string, null: false
+    create table(:devices, primary_key: false) do
+      add :nid, :serial, primary_key: true
+      add :id, :string, null: false
       add :access_token, :string, null: false
       add :display_name, :string
 
       add :account_id, references(:accounts, on_delete: :delete_all), null: false
     end
 
-    create index(:devices, [:device_id, :account_id], unique: true)
+    create index(:devices, [:id, :account_id], unique: true)
     create index(:devices, [:account_id])
     create index(:devices, [:access_token], unique: true)
 
     create table(:device_transactions, primary_key: false) do
       add :txn_id, :string, primary_key: true, null: false
-      add :device_id, references(:devices, on_delete: :delete_all), primary_key: true, null: false
+      add :device_nid, references(:devices, column: :nid, on_delete: :delete_all), primary_key: true
       add :event_id, :string, null: false
     end
   end

priv/repo/seeds.exs

@@ -8,7 +8,7 @@ account =
 
 account
 |> Ecto.build_assoc(:devices,
-  device_id: "android",
+  id: "android",
   display_name: "My Android",
   access_token: "sneed"
 )