Update authentication system, database models, and UI components

fix_dbsession_fk.sql

@@ -0,0 +1,13 @@
+-- Migration script to update DBSession foreign key to reference user.email
+-- Run this when no active sessions exist to avoid deadlocks
+
+BEGIN;
+
+-- Step 1: Drop the existing foreign key constraint if it exists
+ALTER TABLE dbsession DROP CONSTRAINT IF EXISTS dbsession_user_id_fkey;
+
+-- Step 2: Add the new foreign key constraint referencing user.email
+ALTER TABLE dbsession ADD CONSTRAINT dbsession_uid_fkey 
+    FOREIGN KEY (uid) REFERENCES "user"(email);
+
+COMMIT;