diff --git a/AGENTS.md b/AGENTS.md
index ee391cc03..428c802a8 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -15,7 +15,7 @@ bin/dev                # Start development server (runs on port 3006)
 ```
 
 Development URL: http://fizzy.localhost:3006
-Login with: david@37signals.com (development fixtures), password will appear in the browser console
+Login with: david@example.com (development fixtures), password will appear in the browser console
 
 ### Testing
 ```bash
@@ -142,7 +142,7 @@ Key recurring tasks (via `config/recurring.yml`):
 ### Chrome MCP (Local Dev)
 
 URL: `http://fizzy.localhost:3006`
-Login: david@37signals.com (passwordless magic link auth - check rails console for link)
+Login: david@example.com (passwordless magic link auth - check rails console for link)
 
 Use Chrome MCP tools to interact with the running dev app for UI testing and debugging.
 
diff --git a/README.md b/README.md
index b668747e9..8a7877326 100644
--- a/README.md
+++ b/README.md
@@ -21,7 +21,7 @@ bin/dev
 
 You'll be able to access the app in development at http://fizzy.localhost:3006.
 
-To login, enter `david@37signals.com` and grab the verification code from the browser console to sign in.
+To login, enter `david@example.com` and grab the verification code from the browser console to sign in.
 
 ### Running tests
 
diff --git a/bin/dev b/bin/dev
index 287127eda..51d232d91 100755
--- a/bin/dev
+++ b/bin/dev
@@ -1,7 +1,7 @@
 #!/usr/bin/env sh
 
 bin/rails runner - <<EOF
-  puts "Login with david@37signals.com to: http://fizzy.localhost:3006/"
+  puts "Login with david@example.com to: http://fizzy.localhost:3006/"
 EOF
 
 if [ -f tmp/solid-queue.txt ]; then
diff --git a/db/seeds.rb b/db/seeds.rb
index 422921309..bb8db7db8 100644
--- a/db/seeds.rb
+++ b/db/seeds.rb
@@ -13,8 +13,8 @@ else
 
   def create_tenant(signal_account_name)
     tenant_id = ActiveRecord::FixtureSet.identify signal_account_name
-    email_address = "david@37signals.com"
-    identity = Identity.find_or_create_by!(email_address: email_address)
+    email_address = "david@example.com"
+    identity = Identity.find_or_create_by!(email_address: email_address, staff: true)
 
     unless account = Account.find_by(external_account_id: tenant_id)
       account = Account.create_with_owner(
diff --git a/db/seeds/37signals.rb b/db/seeds/37signals.rb
index 3512288dd..f34885428 100644
--- a/db/seeds/37signals.rb
+++ b/db/seeds/37signals.rb
@@ -1,9 +1,9 @@
 create_tenant "37signals"
 
-david = find_or_create_user "David Heinemeier Hansson", "david@37signals.com"
-jason = find_or_create_user "Jason Fried", "jason@37signals.com"
-jz    = find_or_create_user "Jason Zimdars", "jz@37signals.com"
-kevin = find_or_create_user "Kevin Mcconnell", "kevin@37signals.com"
+david = find_or_create_user "David Heinemeier Hansson", "david@example.com"
+jason = find_or_create_user "Jason Fried", "jason@example.com"
+jz    = find_or_create_user "Jason Zimdars", "jz@example.com"
+kevin = find_or_create_user "Kevin Mcconnell", "kevin@example.com"
 
 login_as david
 
diff --git a/db/seeds/honcho.rb b/db/seeds/honcho.rb
index ff15bfbee..e59730380 100644
--- a/db/seeds/honcho.rb
+++ b/db/seeds/honcho.rb
@@ -1,11 +1,11 @@
 create_tenant "Honcho"
 
-david = find_or_create_user "David Heinemeier Hansson", "david@37signals.com"
-jason = find_or_create_user "Jason Fried", "jason@37signals.com"
-jz    = find_or_create_user "Jason Zimdars", "jz@37signals.com"
-kevin = find_or_create_user "Kevin McConnell", "kevin@37signals.com"
-jorge = find_or_create_user "Jorge Manrubia", "jorge@37signals.com"
-mike  = find_or_create_user "Mike Dalessio", "mike@37signals.com"
+david = find_or_create_user "David Heinemeier Hansson", "david@example.com"
+jason = find_or_create_user "Jason Fried", "jason@example.com"
+jz    = find_or_create_user "Jason Zimdars", "jz@example.com"
+kevin = find_or_create_user "Kevin McConnell", "kevin@example.com"
+jorge = find_or_create_user "Jorge Manrubia", "jorge@example.com"
+mike  = find_or_create_user "Mike Dalessio", "mike@example.com"
 
 login_as david
 
diff --git a/script/migrations/signal-id-email-update.rb b/script/migrations/signal-id-email-update.rb
deleted file mode 100755
index 23e06f69f..000000000
--- a/script/migrations/signal-id-email-update.rb
+++ /dev/null
@@ -1,27 +0,0 @@
-#!/usr/bin/env ruby
-
-require_relative "../config/environment"
-
-CHANGES = [
-  { from: "kevin@37signals.com", to: "kevin@basecamp.com" },
-  { from: "david@37signals.com", to: "david@hey.com" },
-  { from: "jay@37signals.com", to: "jay@basecamp.com" },
-  { from: "jeremy@37signals.com", to: "jeremy@basecamp.com" },
-  { from: "jillian@37signals.com", to: "jillian@basecamp.com" },
-  { from: "jorge@37signals.com", to: "jorge@basecamp.com" },
-  { from: "merissa@37signals.com", to: "merissa@basecamp.com" },
-  { from: "michelle@37signals.com", to: "michelle@basecamp.com" },
-  { from: "scott@37signals.com", to: "scott@basecamp.com" },
-  { from: "silvia@37signals.com", to: "silvia@basecamp.com" }
-]
-
-ApplicationRecord.with_each_tenant do |tenant|
-  CHANGES.each do |change|
-    user = User.find_by(email_address: change[:from])
-    if user
-      puts "Updating user #{user.id} in tenant #{tenant}: #{change[:from]} -> #{change[:to]}"
-      user.email_address = change[:to]
-      user.save!
-    end
-  end
-end