Change pkey of User to emailAddress (#2505)

Originally, we though that User entities were going to have mutable
email addresses, and thus would require a non-changing primary key. This
proved to not be the case. It'll simplify the User loading/saving code
if we just do everything by email address.

Obviously this doesn't change much functionality, but it prepares us for
removing the id field down the line once the changes propagate.

db/src/main/resources/sql/schema/db-schema.sql.generated

@@ -885,16 +885,16 @@
     );
 
     create table "User" (
-       id  bigserial not null,
+       email_address text not null,
         update_timestamp timestamptz,
-        email_address text not null,
         registry_lock_email_address text,
         registry_lock_password_hash text,
         registry_lock_password_salt text,
         global_role text not null,
         is_admin boolean not null,
         registrar_roles hstore,
-        primary key (id)
+        id int8,
+        primary key (email_address)
     );
 
     create table "UserUpdateHistory" (
@@ -904,8 +904,8 @@
         history_request_body text,
         history_type text not null,
         history_url text not null,
-        user_id int8 not null,
         email_address text not null,
+        user_id int8 not null,
         registry_lock_email_address text,
         registry_lock_password_hash text,
         registry_lock_password_salt text,
@@ -1016,17 +1016,13 @@ create index reservedlist_name_idx on "ReservedList" (name);
 create index spec11threatmatch_registrar_id_idx on "Spec11ThreatMatch" (registrar_id);
 create index spec11threatmatch_tld_idx on "Spec11ThreatMatch" (tld);
 create index spec11threatmatch_check_date_idx on "Spec11ThreatMatch" (check_date);
-create index user_email_address_idx on "User" (email_address);
-
-    alter table if exists "User" 
-       add constraint UK_seshmd8qn3lcffsjw5j8wnbnd unique (email_address);
 create index IDXbjacjlm8ianc4kxxvamnu94k5 on "UserUpdateHistory" (history_acting_user);
 create index IDX5yqacw829y5bm6f7eajsq1cts on "UserUpdateHistory" (email_address);
 
     alter table if exists "ConsoleEppActionHistory" 
        add constraint FKb686b9os2nsjpv930npa4r3b4 
        foreign key (history_acting_user) 
-       references "User" (email_address);
+       references "User";
 
     alter table if exists "DelegationSignerData" 
        add constraint FKtr24j9v14ph2mfuw2gsmt12kq 
@@ -1066,12 +1062,12 @@ create index IDX5yqacw829y5bm6f7eajsq1cts on "UserUpdateHistory" (email_address)
     alter table if exists "RegistrarPocUpdateHistory" 
        add constraint FKftpbwctxtkc1i0njc0tdcaa2g 
        foreign key (history_acting_user) 
-       references "User" (email_address);
+       references "User";
 
     alter table if exists "RegistrarUpdateHistory" 
        add constraint FKsr7w342s7x5s5jvdti2axqeq8 
        foreign key (history_acting_user) 
-       references "User" (email_address);
+       references "User";
 
     alter table if exists "RegistryLock" 
        add constraint FK2lhcwpxlnqijr96irylrh1707 
@@ -1086,4 +1082,4 @@ create index IDX5yqacw829y5bm6f7eajsq1cts on "UserUpdateHistory" (email_address)
     alter table if exists "UserUpdateHistory" 
        add constraint FK1s7bopbl3pwrhv3jkkofnv3o0 
        foreign key (history_acting_user) 
-       references "User" (email_address);
+       references "User";