Can login with SSO & change Password

src/main/resources/sql/functions/citizen/find_citizen_by_email.sql

@@ -0,0 +1,15 @@
+create or replace function find_citizen_by_email(_email text, out resource json) language plpgsql as
+$$
+begin
+    select to_json(t) into resource
+    from (
+        select
+            z.*,
+            find_user_by_id(z.user_id) as "user"
+        from citizen as z
+        where z.email = _email
+    ) as t;
+end;
+$$;
+
+-- drop function if exists find_citizen_by_email(text, out json);

src/main/resources/sql/migrations/0000-init_schema.up.sql

@@ -19,7 +19,7 @@ create table citizen
     user_id          uuid                                   not null references "user" (id) unique,
     vote_anonymous   boolean     default true               not null,
     follow_anonymous boolean     default true               not null,
-    email            text                                   not null check ( email ~* '.+@.+\..+' )
+    email            text                                   not null check ( email ~* '.+@.+\..+' ) unique
 );
 
 create table workgroup