fix(api): invalidate entitlements cache on plan switch

[mmabrouk]

Summary

• Add cache invalidation for entitlements subscription cache when a plan is switched
• Ensures that plan changes (upgrades/downgrades) take effect immediately without waiting for cache expiry

Problem

When a user switched their subscription plan (e.g., from Pro to Business), the entitlements cache was not being invalidated. This caused:

• The old plan's entitlements to remain in effect
• Features like SSO and Domains to be blocked even after upgrading to Business
• Users had to wait for cache expiry or manually clear Redis to see their new plan's features

Solution

Added a call to invalidate_cache() at the end of process_event() in the subscription service, which clears the entitlements:subscription cache for the organization after any subscription event is processed.

Testing

1. Create a new organization with Pro plan
2. Try to access SSO settings (should be blocked)
3. Upgrade to Business plan
4. SSO settings should now be accessible immediately (no Redis flush needed)

CleanShot.2026-01-15.at.20.42.58.mp4

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Project	Deployment	Review	Updated (UTC)
agenta-documentation	Ready	Preview, Comment	Jan 15, 2026 7:42pm