Refs #30033 -- Checked constraints before committing SQLite schema changes.

This order of operations is more in line with SQLite's documented table
rebuild procedure and ensures that changes aren't committed if foreign key
integrity is broken.

django/db/backends/sqlite3/schema.py

@@ -30,8 +30,8 @@ class DatabaseSchemaEditor(BaseDatabaseSchemaEditor):
         return super().__enter__()
 
     def __exit__(self, exc_type, exc_value, traceback):
-        super().__exit__(exc_type, exc_value, traceback)
         self.connection.check_constraints()
+        super().__exit__(exc_type, exc_value, traceback)
         self.connection.enable_constraint_checking()
 
     def quote_value(self, value):