3.17.6

• Fix bug in recursive model.delete_instance() when a table contains foreign-keys at multiple depths of the graph, #2893.
• Fix regression in pool behavior on systems where time.time() returns identical values for two connections. This adds a no-op comparable sentinel to the heap to prevent any recurrence of this problem, #2901.
• Ensure that subqueries inside CASE statements generate correct SQL.
• Fix regression that broke server-side cursors with Postgres (introduced in 3.16.0).
• Fix to ensure compatibility with psycopg3 - the libpq TransactionStatus constants are no longer available on the Connection instance.
• Fix quoting issue in pwiz that could generate invalid python code for double-quoted string literals used as column defaults.

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