diff --git a/database.sql b/database.sql
index d155b9b..2b11652 100644
--- a/database.sql
+++ b/database.sql
@@ -1,18 +1,27 @@
+create type user_role as enum (
+    'user',
+    'moderator',
+    'admin'
+);
+
 create table users (
     id                  bigserial                   not null,
     telegram_user_id    bigint                      not null,
     first_name          character varying (64)      not null,
     last_name           character varying (64),
     username            character varying (32),
+    role                user_role,
     primary key (id),
     unique (telegram_user_id)
 );
 
 create table poll_schemas (
     id                  bigserial                   not null,
+    owner_id            bigint                      not null,
     name                character varying (32)      not null,
     question            character varying (255)     not null,
     primary key (id),
+    foreign key (owner_id) references users on delete cascade on update cascade,
     unique (name)
 );
 
@@ -27,19 +36,57 @@ create table poll_options (
     unique (poll_schema_id, ordinal)
 );
 
-create table polls (
+create table messages (
     id                  bigserial                   not null,
     telegram_message_id bigint                      not null,
+    created_at          timestamp                   default now() not null,
+    primary key (id),
+    unique (telegram_message_id)
+);
+
+create table text_messages (
+    text                character varying (4096)    not null
+) inherits (messages);
+
+create table poll_messages (
     telegram_poll_id    text                        not null,
     poll_schema_id      bigint                      not null,
-    created_at          timestamp                   default now() not null,
     is_complete         boolean                     default false not null,
-    primary key (id),
-    foreign key (poll_schema_id) references poll_schemas on delete cascade on update cascade,
-    unique (telegram_message_id),
-    unique (telegram_poll_id)
 );
 
+create table media_messages () inherits (messages);
+
+create table media_message_files (
+    id                  bigserial                   not null,
+    media_message_id    bigint                      not null,
+    name                character varying (256)     not null,
+    caption             character varying (4096)    not null,
+    primary key (id),
+    foreign key (media_message_id) references media_messages on delete cascade on update cascade
+);
+
+create table contact_messages (
+    phone_number        character varying (16)      not null,
+    first_name          character varying (32)      not null
+) inherits (messages);
+
+create table dice_messages (
+    value               smallint                    not null
+);
+
+-- create table polls (
+--     id                  bigserial                   not null,
+--     telegram_message_id bigint                      not null,
+--     telegram_poll_id    text                        not null,
+--     poll_schema_id      bigint                      not null,
+--     created_at          timestamp                   default now() not null,
+--     is_complete         boolean                     default false not null,
+--     primary key (id),
+--     foreign key (poll_schema_id) references poll_schemas on delete cascade on update cascade,
+--     unique (telegram_message_id),
+--     unique (telegram_poll_id)
+-- );
+
 create table poll_answers (
     id                  bigserial                   not null,
     poll_id             bigint                      not null,