Summary

The groupHistories Map grows unbounded as new groups/topics are encountered. Keys are never deleted, only values are cleared.

Affected Files

• src/telegram/bot.ts → dist/telegram/bot.js:152
• src/signal/monitor.ts → dist/signal/monitor.js
• src/web/auto-reply/monitor.ts → dist/web/auto-reply/monitor.js
• src/imessage/monitor/monitor-provider.ts → dist/imessage/monitor/monitor-provider.js

Problem

const groupHistories = new Map();  // Never cleaned up

As users interact with more groups/topics over time, the Map grows. Growth is O(unique groups), not O(messages), so it's slow but unbounded.

Impact

• Long-running instances accumulate memory
• Severity: LOW (slow growth, only affects long uptimes with many groups)

Suggested Fix

Option 1: Use a TTL-based Map with automatic eviction

import { createTTLMap } from '../infra/ttl-map.js';
const groupHistories = createTTLMap({ maxAge: 24 * 60 * 60 * 1000 }); // 24h TTL

Option 2: Add periodic LRU eviction for oldest entries

Verification

Confirmed by code analysis with Codex CLI.