Enable introspection of electrified enum types in the proxy

components/electric/lib/electric/postgres/proxy/prisma/query.ex

@@ -455,6 +455,22 @@ defmodule Electric.Postgres.Proxy.Prisma.Query.ViewV5_2 do
   end
 end
 
+defmodule Electric.Postgres.Proxy.Prisma.Query.Type do
+  def data_rows(nspname_array, schema) do
+    namespaces = Electric.Postgres.Proxy.Prisma.Query.parse_name_array(nspname_array)
+
+    for table <- schema.tables,
+        table.name.schema != Electric.Postgres.Extension.schema(),
+        %{type: col_type} <- table.columns,
+        col_type.kind == :ENUM,
+        [schema_name, unqualified_name] = String.split(col_type.name, "."),
+        schema_name in namespaces,
+        val <- col_type.values do
+      [unqualified_name, val, schema_name]
+    end
+  end
+end
+
 defmodule Electric.Postgres.Proxy.Prisma.Query.TypeV4_8 do
   @moduledoc """
   SELECT t.typname as name, e.enumlabel as value, n.nspname as namespace
@@ -485,9 +501,8 @@ defmodule Electric.Postgres.Proxy.Prisma.Query.TypeV4_8 do
     ]
   end
 
-  # we don't support custom types
-  def data_rows([_nspname], _schema, _config) do
-    []
+  def data_rows([nspname_array], schema, _config) do
+    Electric.Postgres.Proxy.Prisma.Query.Type.data_rows(nspname_array, schema)
   end
 end
 
@@ -526,9 +541,9 @@ defmodule Electric.Postgres.Proxy.Prisma.Query.TypeV5_2 do
     ]
   end
 
-  # we don't support custom types
-  def data_rows([_nspname], _schema, _config) do
-    []
+  def data_rows([nspname_array], schema, _config) do
+    Electric.Postgres.Proxy.Prisma.Query.Type.data_rows(nspname_array, schema)
+    |> Enum.map(fn [name, value, namespace] -> [name, value, namespace, nil] end)
   end
 end