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e3716012c5
Added support for PostgreSQL "readonly" and "deferrable" flags for all of psycopg2, asyncpg and pg8000 dialects. This takes advantage of a newly generalized version of the "isolation level" API to support other kinds of session attributes set via execution options that are reliably reset when connections are returned to the connection pool. Fixes: #5549 Change-Id: I0ad6d7a095e49d331618274c40ce75c76afdc7dd