Remove incorrect async engine keepalive settings

[erosselli]

Ticket []

Description Of Changes

Removes some async engine settings that don't work when you set them, since they're not supported by asyncpg; setting them causes the following error:

TypeError: connect() got an unexpected keyword argument 'keepalives_idle'

These settings were originally added in #6128 but that PR seems to only care about the pool_pre_ping setting which does work as usual.

Steps to Confirm

1. N/A

Pre-Merge Checklist

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2 Skipped Deployments

Project	Deployment	Review	Updated (UTC)
fides-plus-nightly	Ignored	Preview	Dec 23, 2025 0:42am
fides-privacy-center	Ignored		Dec 23, 2025 0:42am

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.20%. Comparing base (cfbf98a) to head (34aa14f).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7171      +/-   ##
==========================================
+ Coverage   87.17%   87.20%   +0.02%     
==========================================
  Files         535      535              
  Lines       35330    35315      -15     
  Branches     4113     4107       -6     
==========================================
- Hits        30800    30797       -3     
+ Misses       3639     3630       -9     
+ Partials      891      888       -3     

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[adamsachs]

thanks for the cleanup here!

[adamsachs]

👍

[greptile-apps]

Greptile Summary

Removed async engine keepalive configuration settings that were incompatible with asyncpg driver.

• Removed api_async_engine_keepalives_idle, api_async_engine_keepalives_interval, and api_async_engine_keepalives_count fields from DatabaseSettings
• Removed code in ctl_session.py that attempted to pass these unsupported parameters to create_async_engine()
• Added explanatory comment noting that these settings are purposely excluded because they are not supported by asyncpg
• Sync engine keepalive settings remain unchanged and continue to work correctly with psycopg2

The changes fix a runtime error (TypeError: connect() got an unexpected keyword argument 'keepalives_idle') that would occur when these settings were configured.

Confidence Score: 5/5

• This PR is safe to merge with no risk
• The changes are straightforward and correct: they remove non-functional configuration options that cause runtime errors when used. The removal is properly documented with an explanatory comment, and the equivalent sync engine keepalive settings remain unchanged. No tests need updating since these settings were never functional.
• No files require special attention

Important Files Changed

Filename	Overview
src/fides/api/db/ctl_session.py	removed unsupported asyncpg keepalive settings from async engine configurations
src/fides/config/database_settings.py	removed async keepalive config fields and added explanatory comment about asyncpg incompatibility