Make db/seeds.rb rerunnable when I want to add more cards.

db/seeds.rb

@@ -16,6 +16,7 @@ else
     email_address = "david@37signals.com"
     identity = Identity.find_or_create_by!(email_address: email_address)
 
+    unless account = Account.find_by(external_account_id: tenant_id)
       account = Account.create_with_admin_user(
         account: {
           external_account_id: tenant_id,
@@ -26,6 +27,7 @@ else
           identity: identity
         }
       )
+    end
     Current.account = account
   end
 
@@ -43,7 +45,7 @@ else
   end
 
   def create_board(name, creator: Current.user, all_access: true, access_to: [])
-    Board.create!(name:, creator:, all_access:).tap { it.accesses.grant_to(access_to) }
+    Board.find_or_create_by!(name:, creator:, all_access:).tap { it.accesses.grant_to(access_to) }
   end
 
   def create_card(title, board:, description: nil, status: :published, creator: Current.user)