Updated database schemas

migrations/20260901220106_create_table_user-skins.sql

@@ -0,0 +1,7 @@
+CREATE TABLE IF NOT EXISTS user_skins (
+    id uuid DEFAULT gen_random_uuid() PRIMARY KEY,
+    user_id uuid REFERENCES users(id) NOT NULL,
+    skin_id uuid REFERENCES skins(id),
+    agent_id uuid REFERENCES agents(id),
+    team integer NOT NULL -- 0 = CT, 1 = T, 2 = BOTH
+);