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Taus d5e0298999 Python: Add support for Psycopg2 database connection pools

Our current modelling only treated `psycopg2` insofar as it implemented
PEP 249 (which does not define any notion of connection pool), which
meant we were missing database connections that arose from such pools.

With these changes, we add support for the three classes relating to
database pools that are defined in `psycopg2`. (Note that
`getAnInstance` automatically looks at subclasses, which means this
should also handle cases where the user has defined a new subclass that
inherits from one of these three classes.)

2025-08-25 12:35:57 +00:00