Postgres set pool size

[juanedi]

Adds a way to override the pool size to be used in a Postgres.connection based on a Settings object.

Intended use case: use a small separate fixed-size pool for readiness checks, so these don't compete with requests for DB connections.

See https://noredink.slack.com/archives/C0ARKCTNLUE/p1787592700111799

Part of PDE-4.

[linear]

PDE-4

[Copilot]

Pull request overview

Adds a small API convenience to override the Postgres connection pool size in an existing Settings value (targeting use cases like readiness probes that should not contend with the main request pool), and publishes it as part of a new nri-postgresql release.

Changes:

• Add Postgres.Settings.setPoolSize (re-exported as Postgres.setPoolSize) to override pool size and reset stripes to 1.
• Add unit tests covering setPoolSize behavior.
• Bump package version to 0.4.1.0 and update changelog + golden output to match.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
nri-postgresql/src/Postgres/Settings.hs	Introduces setPoolSize and exports it from the Settings module.
nri-postgresql/src/Postgres.hs	Re-exports setPoolSize from the public Postgres module API.
nri-postgresql/test/PostgresSettingsSpec.hs	Adds a unit test ensuring setPoolSize updates size, resets stripes, and preserves other fields.
nri-postgresql/package.yaml	Bumps package version to 0.4.1.0.
nri-postgresql/nri-postgresql.cabal	Bumps cabal version to 0.4.1.0.
nri-postgresql/CHANGELOG.md	Documents the new Postgres.setPoolSize API in a new release entry.
nri-postgresql/test/golden-results/observability-spec-postgres-reporting-ghc-9	Updates golden output for the new version string and shifted source locations.

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[omnibs]

Looks good. Thank you for pushing this forward.

TIL stripes are a thing. Don't seem useful in our context so ok to hard code.