alert service

internal/repository/postgresql/migrations/000001_init.down.sql

@@ -1,4 +1,5 @@
 drop table if exists alert;
+drop type alert_condition;
 drop table if exists instrument;
 drop table if exists currency;
 drop table if exists users;

internal/repository/postgresql/migrations/000001_init.up.sql

@@ -17,12 +17,15 @@ create table if not exists instrument (
   UNIQUE (base_currency_id, quoted_currency_id)
 );
 
+create type alert_condition as enum ('above', 'below');
+
 create table if not exists alert (
   id uuid primary key not null default gen_random_uuid(),
   user_id uuid references users(id) not null,
   instrument_id uuid references instrument(id) not null,
   price text not null,
-  active bool not null default true
+  active bool not null default true,
+  condition alert_condition not null
 );
 
 insert into currency(symbol) values ('USDT'), ('BTC'), ('ETH'), ('SOL');