perf(tests): move SQL worker schema setup to session scope

[Borda]

Schema creation (CREATE SCHEMA IF NOT EXISTS + engine lifecycle) now runs once per xdist worker session via a new worker_sql_connection session-scoped fixture, eliminating one DB roundtrip per SQL test in parallel runs.

inject_worker_schema_for_sql_tests retains function scope for the cheap per-test monkeypatching of SQLALCHEMY_DATABASE_URL and SQL_CONN_STR.

Closes #361

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.94%. Comparing base (5c4f121) to head (f4e0605).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #369   +/-   ##
=======================================
  Coverage   99.94%   99.94%           
=======================================
  Files          12       12           
  Lines        1731     1731           
  Branches      216      216           
=======================================
  Hits         1730     1730           
  Partials        1        1           

Flag	Coverage Δ
local	59.21% <ø> (ø)
mongodb	40.67% <ø> (+0.11%)	⬆️
postgres	43.44% <ø> (ø)
redis	46.67% <ø> (ø)
s3	42.46% <ø> (ø)

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[Copilot]

Pull request overview

This PR refactors the SQL-test xdist schema-isolation logic in tests/conftest.py by extracting URL/schema helpers, introducing a session-scoped schema-creation fixture, and adding focused unit tests for the helpers.

Changes:

• Add _build_worker_url() and unit tests covering worker schema naming and URL option handling.
• Introduce worker_sql_connection (session-scoped) to create the per-worker PostgreSQL schema once, and simplify per-test monkeypatching.
• Minor logging improvement (parameterized logger.debug during cleanup).

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
tests/conftest.py	Extracts URL-building logic, adds a session fixture to create worker schemas once, and updates the autouse SQL schema injection fixture to reuse it.
tests/test_conftest_helpers.py	Adds unit tests for the new private helpers (_worker_schema_name, _build_worker_url).

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