don't use session

sqlite/schema.sql

@@ -55,11 +55,3 @@ CREATE TABLE IF NOT EXISTS svg_icon (
     id INTEGER PRIMARY KEY AUTOINCREMENT
     ,svg TEXT NOT NULL
 );
-
-
-CREATE TABLE IF NOT EXISTS user_sessions (
-    id TEXT PRIMARY KEY
-    ,user_id TEXT NOT NULL UNIQUE
-    ,created_at TEXT NOT NULL
-    ,FOREIGN KEY (user_id) REFERENCES user(id)
-);