Normalise dashboard TPS graph by the configured refresh interval

[dpage]

Summary

• The "Transactions per second" dashboard chart plotted the raw xact_commit/xact_rollback delta between two polls without dividing by the elapsed time, so it only read correctly at the 1s refresh interval; at any other interval it showed transactions per refresh interval instead of per second.
• statsReducer now accepts an optional rate on the action and divides the counter delta by it; Graphs.jsx passes preferences['tps_stats_refresh'] as the rate for the TPS chart only (the other counters - tuples in/out, block I/O - are not labelled as per-second metrics, so they are left as raw per-interval deltas).

Test plan

• Added a Jest case for statsReducer covering the counter+rate normalisation.
• yarn jest regression/javascript/dashboard/graphs_spec.js regression/javascript/dashboard/graphs_wrapper_spec.js passes (14/14).
• yarn run linter clean.

Closes #10273

Summary by CodeRabbit

• Bug Fixes
  • Improved dashboard transaction-per-second (TPS) calculations by accounting for the configured refresh interval.
  • Ensured counter-based statistics are normalized consistently, providing more accurate rate displays across different refresh settings.

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Review details

⚙️ Run configuration

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Review profile: CHILL

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📥 Commits

Reviewing files that changed from the base of the PR and between a89e615 and 9748b32.

📒 Files selected for processing (1)

• web/pgadmin/dashboard/static/js/Graphs.jsx

Walkthrough

The dashboard now normalizes counter deltas by the configured refresh interval. Non-counter values remain unchanged. Tests verify normalized TPS histories.

Changes

TPS normalization

Layer / File(s)	Summary
Counter rate reduction web/pgadmin/dashboard/static/js/Graphs.jsx, web/regression/javascript/dashboard/graphs_spec.js	statsReducer divides counter deltas by the optional rate. TPS updates pass the configured refresh interval. Tests verify the normalized label histories.

Estimated code review effort: 2 (Simple) | ~10 minutes

Merge Risk: 🟡 Moderate · up to a89e6

Changing the refresh interval can leave the prior TPS counter baseline in place, causing the first post-change chart value to be calculated with mismatched timing and display an incorrect rate. The baseline should be cleared on interval changes and covered by a regression test before merging.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly identifies normalization of the dashboard TPS graph by the configured refresh interval.
Linked Issues check	✅ Passed	The changes normalize TPS deltas by the configured refresh interval and add test coverage, satisfying issue #10273.
Out of Scope Changes check	✅ Passed	The changes are limited to TPS normalization in the dashboard graph reducer and its related test coverage.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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🧪 Generate unit tests (beta)

• Create PR with unit tests

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Actionable comments posted: 1

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Inline comments:
In `@web/pgadmin/dashboard/static/js/Graphs.jsx`:
- Line 183: Update the tps_stats_refresh preference-change branch to clear
counterData['tps_stats'] along with the TPS history before the next
tpsStatsReduce call, ensuring the first value uses a fresh baseline and the new
interval. Add a regression test covering this refresh-interval transition.

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ℹ️ Review info

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Configuration used: Path: .coderabbit.yaml

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📥 Commits

Reviewing files that changed from the base of the PR and between 0ebefaf and a89e615.

📒 Files selected for processing (2)

• web/pgadmin/dashboard/static/js/Graphs.jsx
• web/regression/javascript/dashboard/graphs_spec.js

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