feat(tester): migrate from gRPC to REST

migrations/20240727123308_initial.sql

@@ -1,5 +1,14 @@
 -- +goose Up
 -- +goose StatementBegin
+CREATE FUNCTION updated_at_update() RETURNS TRIGGER
+    LANGUAGE plpgsql AS
+$$
+BEGIN
+    NEW.updated_at = NOW();
+RETURN NEW;
+END;
+$$;
+
 CREATE TABLE IF NOT EXISTS problems
 (
     id            serial         NOT NULL,
@@ -103,15 +112,6 @@ CREATE TRIGGER on_solutions_update
     FOR EACH ROW
 EXECUTE PROCEDURE updated_at_update();
 
-CREATE FUNCTION updated_at_update() RETURNS TRIGGER
-    LANGUAGE plpgsql AS
-$$
-BEGIN
-    NEW.updated_at = NOW();
-    RETURN NEW;
-END;
-$$;
-
 -- +goose StatementEnd
 
 -- +goose Down