Fix onboarding update using wrong column name (class_year → year)

The live Supabase users table has the column named 'year', not
'class_year'. This mismatch caused PostgREST to reject the entire
update, so no onboarding fields were saved.

Author: Jose Cruz

backend/db/migration_onboarding_fields.sql

@@ -3,7 +3,7 @@
 
 ALTER TABLE users ADD COLUMN IF NOT EXISTS first_name TEXT;
 ALTER TABLE users ADD COLUMN IF NOT EXISTS last_name TEXT;
-ALTER TABLE users ADD COLUMN IF NOT EXISTS class_year TEXT;
+ALTER TABLE users ADD COLUMN IF NOT EXISTS year TEXT;
 ALTER TABLE users ADD COLUMN IF NOT EXISTS majors TEXT[] DEFAULT '{}';
 ALTER TABLE users ADD COLUMN IF NOT EXISTS minors TEXT[] DEFAULT '{}';
 ALTER TABLE users ADD COLUMN IF NOT EXISTS learning_style TEXT;

backend/db/supabase_schema.sql

@@ -10,7 +10,7 @@ CREATE TABLE IF NOT EXISTS users (
     email                 TEXT,
     first_name            TEXT,
     last_name             TEXT,
-    class_year            TEXT,
+    year                  TEXT,
     majors                TEXT[] DEFAULT '{}',
     minors                TEXT[] DEFAULT '{}',
     learning_style        TEXT,

backend/routes/onboarding.py

@@ -40,7 +40,7 @@ def save_onboarding_profile(body: OnboardingBody):
             "name": name,
             "first_name": body.first_name,
             "last_name": body.last_name,
-            "class_year": body.year,
+            "year": body.year,
             "majors": body.majors,
             "minors": body.minors,
             "learning_style": body.learning_style,

backend/tests/test_onboarding_routes.py

@@ -80,7 +80,7 @@ def factory(name):
         assert update_data["first_name"] == "Jose"
         assert update_data["last_name"] == "Cruz"
         assert update_data["name"] == "Jose Cruz"
-        assert update_data["class_year"] == "junior"
+        assert update_data["year"] == "junior"
         assert update_data["majors"] == ["Computer Science"]
         assert update_data["minors"] == ["Mathematics"]
         assert update_data["learning_style"] == "visual"