feat: Store extra data in the database for efficiency's sake

Extra data:

* Redmine project ID
* Redmine issue subject
* Redmine activity name

backend/sql/schema.sql

@@ -1,6 +1,6 @@
 -- The relational database schema for Urdr, storing the data that is not
 -- kept by Redmine by default but that we need to be persistent between
--- sessions.
+-- sessions.  We also store some data here for efficiency reasons.
 --
 -- We assume that this file is used to initialize a SQLite database.
 -- The Go code does thes automatically, but you may also do so from the
@@ -64,12 +64,21 @@ CREATE TABLE user_setting (
 -- a hidden entry.  We also store a sorting priority, which determines
 -- the relative positioning in the user interface (it's essentially a
 -- sorting key).
+--
+-- For reasons of efficiency, we additionally store the Redmine project
+-- ID and name, the Redmine issue subject, and the Redmine activity
+-- name.  This is not strictly necessary, but it makes it easier to
+-- display the data in the user interface without having to query the
+-- Redmine API for each entry.
 
 DROP TABLE IF EXISTS priority_entry;
 CREATE TABLE priority_entry (
 	redmine_user_id INTEGER NOT NULL,
+	redmine_project_id INTEGER NOT NULL,
 	redmine_issue_id INTEGER NOT NULL,
+	redmine_issue_subject TEXT,
 	redmine_activity_id INTEGER NOT NULL,
+	redmine_activity_name TEXT,
 	name TEXT,
 	is_hidden BOOLEAN,
 	priority INTEGER NOT NULL,