psy

[aspicer]

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Changes

Does this work well for both Cloud and self-hosted?

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[greptile-apps]

PR Summary

This PR migrates from the deprecated psycopg2 PostgreSQL adapter to the newer psycopg (v3) adapter across the PostHog codebase.

• Updated database engine from django.db.backends.postgresql_psycopg2 to django.db.backends.postgresql in data_stores.py
• Changed import statements from psycopg2 to psycopg in multiple files including test_health.py and external_data_source.py
• Updated connection handling in warehouse models to use psycopg.connect() instead of psycopg2.connect()
• Modified DSN parsing from psycopg2.extensions.parse_dsn to psycopg.dsn.parse in batch export functionality
• Removed psycopg2-binary==2.9.7 dependency and updated psycopg[binary] to version 3.2.6 in pyproject.toml

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