## Summary
- Reset the table rows query after the user confirms loading data on a
high-cost table, so React Query re-executes the fetch without the
preflight check
- Close the confirmation dialog after the user clicks "I understand,
proceed"
**Root cause:** `preflightCheck` is intentionally excluded from the
React Query query key (to avoid duplicate cache entries). When the user
clicked "Load data", the preflight flag flipped to `false` but the query
key stayed the same — so React Query returned the cached error instead
of refetching.
## Test plan
- [x] Navigate to a table with high estimated query cost (triggers "Data
not loaded to protect database performance")
- [x] Click "Load data" → "I understand, proceed"
- [x] Verify the dialog closes and table data loads
- [x] Verify the warning does not reappear for the same table in the
same session
To test this you can run this locally with COST_THRESHOLD set to a low
value (< 10)
Fixes FE-2979
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **Bug Fixes**
* Confirming the high-cost warning now closes the dialog and proceeds
with loading as expected.
* Improved query cache key composition so queries reflect the full set
of relevant parameters for correct caching.
* Loading from the grid error now properly clears related cached results
and proceeds when the user confirms.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
## Context
Related to this previous PR
[here](https://github.com/supabase/supabase/pull/42321)
Table Editor: Adding a CTA to the `HighQueryCost` UI to allow users to
proceed with fetching data despite the high query cost warning, to
prevent completely blocking the users from their workflows (realised
that certain heavy queries are required and this safeguard shouldn't be
creating dead-ends for users)
<img width="1159" height="264" alt="image"
src="https://github.com/user-attachments/assets/5fa01f7f-4442-4349-91f2-f4275e177f89"
/>
Clicking "Load more" will open a confirmation dialog, in which
proceeding to load the data will thereafter suppress this preflight
check for the table, for the rest of the browser session
<img width="450" height="305" alt="image"
src="https://github.com/user-attachments/assets/d3197a5d-a861-47a8-95da-e157972ce092"
/>
## Other changes
- Also bumped the query cost threshold from 100,000 to 200,000 - the
former might have been too aggressive 😓
- (Unrelated) Added query cost tooltip for cron jobs high query cost
warning
<img width="450" height="230" alt="image"
src="https://github.com/user-attachments/assets/d2c66972-7c4c-4f99-818c-e90a0991c2f5"
/>
## Context
Part of an investigation to see how we can make the dashboard more
resilient for large databases by ensuring that the dashboard never
becomes the reason for taking down the database accidentally.
Am proposing that for interfaces that rely heavily on queries to the
database for data to render, we add preflight checks to ensure that we
never run queries that exceed a certain cost threshold (and also have UI
handlers to communicate this) - this can be done by running an EXPLAIN
query before running the actual query, and if the cost from the EXPLAIN
exceeds a specified threshold, the UI throws an error then and skips
calling the actual query.
## Demo
Am piloting this with the Table Editor, and got an example here in which
my table has 500K+ rows, and I'm trying to sort on an unindexed column:
https://github.com/user-attachments/assets/ccad2ea9-d62c-4106-8295-2a6df5941474
With this UX, the pros are that
- It's relatively seamless and not too invasive, most users won't notice
this unless they run into this specific scenario
- We can incrementally apply this to other parts of the dashboard, next
will probably be Auth Users for example
However there are some considerations:
- The additional EXPLAIN query adds a bit more latency to the query
since its a separate API request to the query endpoint
- ^ On a similar note, it will hammer the API a bit more, which may
result in higher probability of 429s
- However, I reckon that the preflight checks are meant to be used
sparingly and only for certain parts of the dashboard that we believe
may cause high load.
- e.g for the Table Editor, reckon we only need this for fetching rows?
The count query is largely optimized already (although we could just add
a preflight check there too)
- It's just meant to be a safeguard to prevent running heavy queries on
the database
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **New Features**
* Query preflight with cost checks and a user-facing high-cost dialog
showing cost details and remediation suggestions.
* Grid exposes an explicit error flag and surfaces richer error
metadata.
* **Bug Fixes**
* Standardized error handling and more consistent error displays across
the app.
* Explain analysis now reports an additional max-cost metric for
queries.
* **UI**
* Tweaked empty-state interaction/layout and slightly wider header
delete control.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
---------
Co-authored-by: Ali Waseem <waseema393@gmail.com>
