Show Reddit post age in conversations

tests/database.test.ts

@@ -156,7 +156,7 @@ describe('Database Client', () => {
         DROP TABLE conversation_automation_claims;
         DROP TABLE ai_usage;
       `);
-      db.pragma(`user_version = ${latestVersion - 2}`);
+      db.pragma(`user_version = ${latestVersion - 3}`);
       runMigrations(db);
 
       expect(db.prepare('SELECT recipient, reason FROM recipient_suppressions ORDER BY recipient COLLATE NOCASE').all())
@@ -176,6 +176,7 @@ describe('Database Client', () => {
       expect(columnMap.get('subreddit')?.notnull).toBe(1);
       expect(columnMap.get('author')?.notnull).toBe(1);
       expect(columnMap.get('title')?.notnull).toBe(1);
+      expect(columnMap.get('post_created_at')).toBeDefined();
       expect(columnMap.get('processed_at')?.notnull).toBe(1);
       expect(columnMap.get('message_sent')).toBeDefined();
       expect(columnMap.get('error')).toBeDefined();