namespace email settings keys per adapter

Settings keys like api_key were shared across providers, so switching
from e.g. Postmark to SendGrid showed the old API key. Now each
adapter gets its own namespaced key (email_postmark_api_key, etc.)
so credentials persist independently and switching back pre-fills
previously saved values.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

test/berrypod/mailer/adapters_test.exs

@@ -55,14 +55,14 @@ defmodule Berrypod.Mailer.AdaptersTest do
   end
 
   describe "field_keys/1" do
-    test "returns settings keys prefixed with email_" do
+    test "returns namespaced settings keys" do
       smtp = Adapters.get("smtp")
       keys = Adapters.field_keys(smtp)
 
-      assert "email_relay" in keys
-      assert "email_port" in keys
-      assert "email_username" in keys
-      assert "email_password" in keys
+      assert "email_smtp_relay" in keys
+      assert "email_smtp_port" in keys
+      assert "email_smtp_username" in keys
+      assert "email_smtp_password" in keys
     end
   end
 
@@ -70,9 +70,16 @@ defmodule Berrypod.Mailer.AdaptersTest do
     test "returns unique keys from all adapters" do
       keys = Adapters.all_field_keys()
       assert is_list(keys)
-      assert "email_api_key" in keys
-      assert "email_relay" in keys
+      assert "email_postmark_api_key" in keys
+      assert "email_smtp_relay" in keys
       assert length(keys) == length(Enum.uniq(keys))
     end
   end
+
+  describe "settings_key/2" do
+    test "namespaces key with adapter" do
+      assert Adapters.settings_key("postmark", "api_key") == "email_postmark_api_key"
+      assert Adapters.settings_key("smtp", "relay") == "email_smtp_relay"
+    end
+  end
 end

test/berrypod/mailer_test.exs

@@ -26,7 +26,7 @@ defmodule Berrypod.MailerTest do
   describe "load_config/0" do
     test "loads adapter config from settings" do
       Settings.put_setting("email_adapter", "postmark")
-      Settings.put_secret("email_api_key", "pm_test_key_123")
+      Settings.put_secret("email_postmark_api_key", "pm_test_key_123")
 
       Mailer.load_config()
 
@@ -37,10 +37,10 @@ defmodule Berrypod.MailerTest do
 
     test "loads SMTP config with multiple fields" do
       Settings.put_setting("email_adapter", "smtp")
-      Settings.put_setting("email_relay", "smtp.example.com")
-      Settings.put_setting("email_port", 465, "integer")
-      Settings.put_setting("email_username", "user@example.com")
-      Settings.put_secret("email_password", "secret123")
+      Settings.put_setting("email_smtp_relay", "smtp.example.com")
+      Settings.put_setting("email_smtp_port", 465, "integer")
+      Settings.put_setting("email_smtp_username", "user@example.com")
+      Settings.put_secret("email_smtp_password", "secret123")
 
       Mailer.load_config()
 
@@ -67,7 +67,7 @@ defmodule Berrypod.MailerTest do
 
     test "returns adapter key and config when configured from settings" do
       Settings.put_setting("email_adapter", "postmark")
-      Settings.put_secret("email_api_key", "pm_test_key_123")
+      Settings.put_secret("email_postmark_api_key", "pm_test_key_123")
 
       Mailer.load_config()