diff --git a/app/models/session.py b/app/models/session.py
index e7ae3b3..c9337a9 100644
--- a/app/models/session.py
+++ b/app/models/session.py
@@ -170,13 +170,13 @@ class Session(Base):
         Index("ix_sessions_website_id", "website_id"),
         Index("ix_sessions_tryout_id", "tryout_id"),
         Index("ix_sessions_is_completed", "is_completed"),
-        # Score constraints [0, 1000]
+        # Score constraints [0, 1000] - quote column names to match quoted identifiers
         CheckConstraint(
-            "NM IS NULL OR (NM >= 0 AND NM <= 1000)",
+            '"NM" IS NULL OR ("NM" >= 0 AND "NM" <= 1000)',
             "ck_nm_range",
         ),
         CheckConstraint(
-            "NN IS NULL OR (NN >= 0 AND NN <= 1000)",
+            '"NN" IS NULL OR ("NN" >= 0 AND "NN" <= 1000)',
             "ck_nn_range",
         ),
         # IRT theta constraint [-3, +3]