Initial open source release

deploy/migrations/0008_user_id_sequence_base.down.sql

@@ -0,0 +1,8 @@
+-- Revert generated ordinary user ids to the original first-phase base when possible.
+-- Existing users keep their ids; the next generated id is never moved below MAX(id)+1.
+
+SELECT setval(
+    pg_get_serial_sequence('users', 'id'),
+    GREATEST((SELECT COALESCE(MAX(id), 0) FROM users), 999999999),
+    true
+);