feat: got sessions working

sparse-server/migrations/20250129045406_readd_sessions.sql

@@ -0,0 +1,8 @@
+CREATE TABLE sessions (
+    session_id char(64) NOT NULL,
+    user_id int NOT NULL,
+    expires int NOT NULL,
+
+    PRIMARY KEY (session_id),
+    FOREIGN KEY (user_id) REFERENCES users
+);