Refs #27090 -- Added real database sequence introspection.

Thanks Mariusz Felisiak for the Oracle part and Tim Graham for the
review.

django/db/backends/sqlite3/introspection.py

@@ -85,6 +85,10 @@ class DatabaseIntrospection(BaseDatabaseIntrospection):
             ) for info in self._table_info(cursor, table_name)
         ]
 
+    def get_sequences(self, cursor, table_name, table_fields=()):
+        pk_col = self.get_primary_key_column(cursor, table_name)
+        return [{'table': table_name, 'column': pk_col}]
+
     def column_name_converter(self, name):
         """
         SQLite will in some cases, e.g. when returning columns from views and