fix: increase session TTL to 7 days

[four-bytes-robby]

Prevents active sessions from being evicted after 1 hour. Closes the token counter reset bug.

Change

• src/four-opencode-token-budget-guard.ts: default FOUR_TBG_SESSION_TTL_MS from 60 * 60 * 1000 (1 hour) to 7 * 24 * 60 * 60 * 1000 (7 days)
• Active sessions longer than 1 hour were being evicted from the SessionTokenCache, causing the token counter to reset mid-session

Why 7 days

• Aligns with typical opencode session lifetime
• Env var override (FOUR_TBG_SESSION_TTL_MS) still available for shorter/longer values

---

Summary by cubic

Increase the default session TTL from 1 hour to 7 days in SessionTokenCache to stop active-session eviction and token counter resets. Override via FOUR_TBG_SESSION_TTL_MS is still supported; change is in src/four-opencode-token-budget-guard.ts.

^{Written for commit 46e07dc. Summary will update on new commits.}

Summary by CodeRabbit

Chores

• Extended default session timeout from 1 hour to 7 days, allowing users to maintain active sessions longer before automatic expiration.

[coderabbitai]

Caution

Review failed

The pull request is closed.

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: f02d2d02-d911-43f1-9acf-d141942861fa

📥 Commits

Reviewing files that changed from the base of the PR and between 66b4d05 and 46e07dc.

📒 Files selected for processing (1)

• src/four-opencode-token-budget-guard.ts

---

📝 Walkthrough

Walkthrough

The default fallback value for the FOUR_TBG_SESSION_TTL_MS environment variable, used when constructing SessionTokenCache, is increased from 1 hour (60 * 60 * 1000) to 7 days (7 * 24 * 60 * 60 * 1000).

Changes

Session TTL Default Update

Layer / File(s)	Summary
SessionTokenCache default TTL: 1 hour → 7 days src/four-opencode-token-budget-guard.ts	The hardcoded fallback for FOUR_TBG_SESSION_TTL_MS is changed from 60 * 60 * 1000 to 7 * 24 * 60 * 60 * 1000, extending the default session lifetime from 1 hour to 7 days.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/session-ttl

---

_{Comment @coderabbitai help to get the list of available commands and usage tips.}