(untested) SQL to backfill linked_accounts (deploy 2)

Author: carols10cents

script/backfill-linked-accounts.sql

@@ -0,0 +1,7 @@
+INSERT INTO linked_accounts (user_id, provider, account_id, access_token, login, avatar)
+SELECT id, 0, gh_id, gh_access_token, gh_login, gh_avatar
+FROM users
+LEFT JOIN linked_accounts
+ON users.id = linked_accounts.user_id
+WHERE gh_id != -1
+AND linked_accounts.user_id IS NULL;