feat: persist settings and enrich conversation context

tests/database.test.ts

@@ -105,16 +105,18 @@ describe('Database Client', () => {
       const tables = db
         .prepare("SELECT name FROM sqlite_master WHERE type='table' AND name NOT LIKE 'sqlite_%'")
         .all() as { name: string }[];
-      // processed_posts, sent_messages, successful_messages, activity_log, reddit_users, delivery_outbox, conversation_states, conversation_outcomes
-      expect(tables.length).toBe(8);
+      // Eight domain tables plus the singleton application configuration table.
+      expect(tables.length).toBe(9);
     });
 
     it('tracks schema version and migrates a legacy sent_messages table transactionally', () => {
       db.exec(`
         CREATE TABLE processed_posts (id TEXT PRIMARY KEY, subreddit TEXT NOT NULL, author TEXT NOT NULL, title TEXT NOT NULL, image_url TEXT, image_analysis TEXT, generated_message TEXT, processed_at INTEGER NOT NULL, message_sent INTEGER DEFAULT 0, error TEXT);
         CREATE TABLE sent_messages (id INTEGER PRIMARY KEY AUTOINCREMENT, post_id TEXT NOT NULL, recipient TEXT NOT NULL, subject TEXT NOT NULL, message TEXT NOT NULL, sent_at INTEGER NOT NULL);
+        CREATE TABLE activity_log (id INTEGER PRIMARY KEY AUTOINCREMENT, timestamp INTEGER NOT NULL, type TEXT NOT NULL, message TEXT NOT NULL, recipient TEXT, image_url TEXT);
         INSERT INTO processed_posts VALUES ('post-1', 'test', 'author', 'title', NULL, NULL, NULL, 1, 0, NULL);
         INSERT INTO sent_messages (post_id, recipient, subject, message, sent_at) VALUES ('post-1', 'recipient', 'subject', 'message', 2);
+        INSERT INTO activity_log (timestamp, type, message, recipient) VALUES (2, 'sent', 'Sent message to u/recipient (r/test)', 'recipient');
       `);
 
       runMigrations(db);
@@ -124,6 +126,10 @@ describe('Database Client', () => {
       const postId = db.prepare('PRAGMA table_info(sent_messages)').all().find((column: { name: string }) => column.name === 'post_id') as { notnull: number };
       expect(postId.notnull).toBe(0);
       expect(db.prepare("SELECT name FROM sqlite_master WHERE type = 'table' AND name = 'delivery_outbox'").get()).toBeDefined();
+      expect(db.prepare('SELECT post_title, post_url FROM activity_log').get()).toEqual({
+        post_title: 'title',
+        post_url: 'https://www.reddit.com/r/test/comments/post-1/',
+      });
     });
 
     it('processed_posts has correct schema', () => {