добавил миграцию

KLHZ.Trader.Infrastructure/postgres/migration3.sql

@@ -1,12 +1,14 @@
-drop table if exists instrument_trades;
-create table instrument_trades
+drop table if exists orderbook_items;
+create table orderbook_items
 (
-    trade_id bigserial,
-    bought_at timestamp default current_timestamp,
+    id bigserial,
+    time timestamp default current_timestamp,
     figi text not null,
     ticker text not null,
     price decimal not null,
-    count decimal not null,
-    direction int not null default 1,
-    primary key (trade_id)
-);
+    count bigint not null,
+    item_type int not null default 1,
+    primary key (id)
+);
+
+CREATE INDEX orderbook_items_index ON orderbook_items USING btree(figi, time, item_type);