Cache Invalidation Controls
Clear stale cached data without flushing everything or restarting.
What it adds
An operator control that invalidates cache entries by namespace, tenant, or resource — scoped, propagated across processes, and recorded.
What your agent is told to do
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What your agent is told to do
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Define named invalidation scopes rather than free-text key entry. An operator picks a namespace, a tenant, or a specific resource; they do not type raw cache keys.
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Enforce tenancy on every scope. One workspace's operator must be structurally incapable of clearing another workspace's entries — check the scope against their permissions before building the key pattern, not after.
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Propagate invalidation to every process and region that holds a copy. In-process and edge caches will not hear about a change made in a shared store unless you tell them, and a clear that only affects one server is worse than no clear because it looks like it worked.
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Report completion honestly. Show the operator when the invalidation has been acknowledged everywhere, and show it as pending until then.
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Record every manual clear: who, what scope, when, and how many entries were affected. Manual cache clears are a common step in incidents and need to appear in the timeline.
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Do NOT expose a global flush-everything button to ordinary operators. A full flush of a warm cache stampedes the database at exactly the moment the system is already unhealthy.
Edge cases it handles
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Edge cases it handles
7- Clearing a hot key causes a thundering herd of identical recomputes. Rebuild behind a single-flight lock rather than letting every request recompute.
- A clear issued while a slow write is in flight can be immediately re-poisoned by the older value finishing last. Invalidate after the write commits, not before.
- Wildcard or prefix scans are expensive or unsupported on some cache backends. Prefer versioned namespace keys so invalidation is a single increment.
- If the cache backend is unreachable, the control must fail loudly. A clear that silently did nothing is the worst possible outcome.
- Repeated clears of the same scope in quick succession should be rate-limited — an anxious operator clicking during an incident can keep the cache permanently cold.
- Derived and dependent caches must be considered. Clearing a record often requires clearing the lists and counts that included it.
- The audit record must name the scope, never dump the cached values, which may contain personal data.
Definition of done
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Definition of done
9- Invalidation is issued by named scope, never by free-text key.
- A scope outside the operator's permissions is rejected before any keys are touched.
- Invalidation reaches every process and region, and the UI shows pending until acknowledged.
- Every manual clear is recorded with actor, scope, time, and effect.
- Rebuilds after a clear are single-flighted rather than stampeding.
- An unreachable cache backend produces a visible error, not a false success.
- Global flush requires elevated permission and an explicit confirmation.
- The feature matches the existing design system.
- No existing functionality is broken.
Related features
Content Reporting
Content Reporting
Let users flag content that needs a human to look at it.
What it does
A reporting flow that captures a reason, a snapshot of context, and enough signal for a moderator — without exposing the reporter.
How it works
- 1 Add a report action to every user-generated surface: posts, comments, profiles, files, messages. Offer a short list of concrete reasons plus an optional free-text field.
- 2 Capture the context a moderator needs at the moment of reporting — the content ID, its current body, the author, and a timestamp — so the review is not dependent on the content still existing.
- 3 Give the reporter an immediate self-serve action alongside the report: hide this item, mute this author, or both. A report that takes hours to review leaves the user staring at the thing they reported.
Copy the prompt
No account needed
Add this feature to my app:
https://addthisfeature.com/x/content-reporting
Scheduled Job Monitor
Scheduled Job Monitor
Find out a nightly task stopped running before your users do.
What it does
A record of every recurring schedule, the runs it was expected to make, and alerts when a run is missed or late.
How it works
- 1 Register every recurring task with its schedule expression, its time zone, and an expected maximum duration. A schedule that is not registered cannot be monitored.
- 2 Record the start and the completion of each run separately. A task that started and never finished is a different failure from one that never started, and they need different alerts.
- 3 Compute the expected run times forward from the schedule and compare them against actual starts. Alert on a missed run, and alert separately when a run starts on time but overruns its expected duration.
Copy the prompt
No account needed
Add this feature to my app:
https://addthisfeature.com/x/scheduled-job-monitor
Maintenance Mode
Maintenance Mode
Pause the app on purpose instead of serving a generic 500.
What it does
An operator-controlled outage window that shows a real maintenance page, lets staff through, and tells API clients the truth.
How it works
- 1 Make the mode a runtime flag an operator can flip without a deploy, and store it somewhere that stays reachable when the database is the thing being maintained.
- 2 Allowlist bypass for authenticated staff and for the health check endpoint, so the people fixing the problem can still use the app and the load balancer does not remove every instance.
- 3 Return 503 with a Retry-After header for API and crawler requests, and render the maintenance page for browsers. A 200 on a maintenance page tells search engines your content is now an apology.
Copy the prompt
No account needed
Add this feature to my app:
https://addthisfeature.com/x/maintenance-mode
How it works
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1
Copy the link
Grab the Markdown instruction URL for this feature.
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Give it to your AI
Paste it into Claude Code, Cursor, v0, Lovable — whatever you build with.
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It inspects, then implements
Your agent reads your existing app first, then adds the feature to fit it.
Works with your stack
These instructions are written to adapt. They tell the agent to detect your framework, match your existing design system, and reuse what you already have — rather than assuming a particular stack.
Need it tighter than that? Customize the feature and tell it exactly what you're running.