Increase AI chat expiration time to 30 days

[rmn-snpk]

Fixes OPS-3159.

[linear]

OPS-3159 Increase the expiration of chat history to 1 month

[coderabbitai]

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[Copilot]

Pull request overview

This PR increases the expiration time for AI chat sessions from 24 hours to 30 days by updating the default value of the LLM_CHAT_EXPIRE_TIME_SECONDS system property.

• Updated LLM_CHAT_EXPIRE_TIME_SECONDS default value from 86400 seconds (24 hours) to 2592000 seconds (30 days)

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[greptile-apps]

Greptile Overview

Greptile Summary

Increased AI chat session expiration time from 24 hours to 30 days by updating the LLM_CHAT_EXPIRE_TIME_SECONDS constant.

• Extended cache TTL for chat context, history, and tool selections from 86400 to 2592000 seconds
• Mathematical calculation is correct: 30 days × 24 hours × 60 minutes × 60 seconds = 2,592,000 seconds
• Comment accurately reflects the new duration
• Impacts all AI chat sessions stored in Redis/cache, allowing longer conversation persistence

Confidence Score: 5/5

• This PR is safe to merge with minimal risk
• Simple constant change with correct math, accurate comment, and no logical issues. The change only affects cache expiration time for AI chat sessions, extending user session persistence from 1 day to 30 days.
• No files require special attention

Important Files Changed

File Analysis

Filename	Score	Overview
packages/server/shared/src/lib/system/system.ts	5/5	Increased LLM_CHAT_EXPIRE_TIME_SECONDS from 86400 (24 hours) to 2592000 (30 days) - simple constant change

Sequence Diagram

sequenceDiagram
    participant User
    participant AIChatService
    participant System
    participant Cache

    User->>AIChatService: Create/Update Chat
    AIChatService->>System: getNumberOrThrow(LLM_CHAT_EXPIRE_TIME_SECONDS)
    System-->>AIChatService: Returns 2592000 (30 days)
    AIChatService->>Cache: setSerializedObject(key, data, 2592000)
    Cache-->>AIChatService: Chat data stored with 30-day TTL
    AIChatService-->>User: Chat session active
    
    Note over Cache: Data expires after 30 days<br/>(previously 24 hours)

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[greptile-apps]

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