diff --git a/db/schema.sql b/db/schema.sql
new file mode 100644
index 0000000..a05bcd6
--- /dev/null
+++ b/db/schema.sql
@@ -0,0 +1,5 @@
+CREATE TABLE IF NOT EXISTS persons (
+    username  text PRIMARY KEY CHECK (char_length(username) BETWEEN 3 AND 32),
+    real_name text NOT NULL,
+    birthday  date NOT NULL
+);
\ No newline at end of file