diff --git a/migrations/20240727123308_initial.sql b/migrations/20240727123308_initial.sql
index 9a2d71d..8b40b4c 100644
--- a/migrations/20240727123308_initial.sql
+++ b/migrations/20240727123308_initial.sql
@@ -11,13 +11,13 @@ CREATE TABLE IF NOT EXISTS problems
     tutorial      varchar(10240) NOT NULL DEFAULT '',
     latex_summary varchar(10240) NOT NULL DEFAULT '',
     time_limit    integer        NOT NULL DEFAULT 1000,
-    memory_limit  integer        NOT NULL DEFAULT 65536,
+    memory_limit  integer        NOT NULL DEFAULT 64,
     created_at    timestamptz    NOT NULL DEFAULT now(),
     updated_at    timestamptz    NOT NULL DEFAULT now(),
     PRIMARY KEY (id),
     CHECK (length(title) != 0),
-    CHECK (memory_limit > 0),
-    CHECK (time_limit > 0)
+    CHECK (memory_limit BETWEEN 4 and 1024),
+    CHECK (time_limit BETWEEN 250 and 15000)
 );
 
 CREATE TRIGGER on_problems_update