Index: sql/schema_creation.sql
===================================================================
--- sql/schema_creation.sql	(revision 1b20b226a74790f84dc06dc488f4f761b510a3f2)
+++ sql/schema_creation.sql	(revision 20df1a33a74bc8c0aacbab3ab6c1e43df4734d41)
@@ -115,5 +115,4 @@
 CREATE TABLE payment (
     id             INTEGER PRIMARY KEY GENERATED BY DEFAULT AS IDENTITY,
-    user_id        INTEGER NOT NULL REFERENCES users (id),
     enrollment_id  INTEGER NOT NULL REFERENCES enrolled_semesters (id),
     amount         INTEGER NOT NULL