feat: allow update_ttl and update_lifecycle to accept None to clear values (ENG-3189)

[devin-ai-integration]

Summary

Allow SandboxInstance.update_ttl() and SandboxInstance.update_lifecycle() to clear existing values by accepting None.

Previously both methods required non-None values — there was no way to remove an existing TTL or lifecycle configuration through these helpers, even though the server supports it.

- async def update_ttl(cls, sandbox_name: str, ttl: str)
+ async def update_ttl(cls, sandbox_name: str, ttl: Optional[str])

When ttl is None or "", spec.runtime.ttl is set to None (serialized as JSON null).

- async def update_lifecycle(cls, sandbox_name: str, lifecycle: SandboxLifecycle)
+ async def update_lifecycle(cls, sandbox_name: str, lifecycle: Optional[SandboxLifecycle])

When lifecycle is None, spec.lifecycle is set to None in the request body. Uses dict serialization to work around the generated model's truthiness checks on the lifecycle field.

Both async (sandbox/default/) and sync (sandbox/sync/) variants are updated.

Part of a coordinated change across sdk-typescript, sdk-python, and sdk-go.

Link to Devin session: https://app.devin.ai/sessions/9c34a09514f74a6a92006ade786b3885
Requested by: @cploujoux

---

Note

Allows update_ttl and update_lifecycle to accept None to clear existing values. The follow-up commit replaces falsy coercion (ttl if ttl else None) with an explicit check (ttl is None or ttl == "") for more precise semantics.

^{Written by Mendral for commit 9d5ab2c.}

[devin-ai-integration]

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[mendral-app]

✅ Linked to Linear issue ENG-3189 — status: In Review

Note

Posted by Linear Issue Enforcer · Tag @mendral-app with feedback.

[mendral-app]

LGTM

The follow-up commit improves the TTL check from falsy coercion to an explicit None/empty-string test — a minor but correct refinement. No new correctness, security, or data-loss issues introduced.

_{Tag @mendral-app with feedback or questions. View session}