diff --git a/database/tasks-functions.sql b/database/tasks-functions.sql
index 949e047..ca79819 100644
--- a/database/tasks-functions.sql
+++ b/database/tasks-functions.sql
@@ -72,7 +72,7 @@ CREATE FUNCTION finish_task( t_id INT , u_id INT , n_text TEXT )
 	AS $finish_task$
 BEGIN
 	PERFORM 1 FROM tasks_single_view t
-		WHERE task_id = t_id AND badness = 0;
+		WHERE id = t_id AND badness = 0;
 	IF NOT FOUND THEN
 		RETURN 2;
 	END IF;
diff --git a/database/upgrade/from-205130326245fa8175bc390ce58b387b92d568a7.sql b/database/upgrade/from-205130326245fa8175bc390ce58b387b92d568a7.sql
new file mode 100644
index 0000000..e184d74
--- /dev/null
+++ b/database/upgrade/from-205130326245fa8175bc390ce58b387b92d568a7.sql
@@ -0,0 +1,41 @@
+--
+-- Upgrade the database from commit ID 205130326245fa8175bc390ce58b387b92d568a7
+--
+-- Run this from the top-level directory
+--
+
+
+\i database/config.sql
+\c :db_name
+
+BEGIN;
+	DROP FUNCTION finish_task( INT , INT , TEXT );
+	CREATE FUNCTION finish_task( t_id INT , u_id INT , n_text TEXT )
+			RETURNS INT
+			STRICT VOLATILE
+			SECURITY INVOKER
+		AS $finish_task$
+	BEGIN
+		PERFORM 1 FROM tasks_single_view t
+			WHERE id = t_id AND badness = 0;
+		IF NOT FOUND THEN
+			RETURN 2;
+		END IF;
+
+		BEGIN
+			INSERT INTO completed_tasks ( task_id , user_id )
+				VALUES ( t_id , u_id );
+		EXCEPTION
+			WHEN unique_violation THEN
+				RETURN 1;
+		END;
+
+		UPDATE tasks SET user_id_assigned = NULL WHERE task_id = t_id;
+		INSERT INTO notes ( task_id , user_id , note_text )
+			VALUES ( t_id , u_id , n_text );
+		RETURN 0;
+	END;
+	$finish_task$ LANGUAGE plpgsql;
+	REVOKE EXECUTE ON FUNCTION finish_task( INT , INT , TEXT ) FROM PUBLIC;
+	GRANT EXECUTE ON FUNCTION finish_task( INT , INT , TEXT ) TO :webapp_user;
+COMMIT;