[Zope-dev] z3c.saconfig engine creation configuration

[Malthe Borch]

On MySQL, it's necessary to supply to ``pool_recycle`` parameter on 
engine creation, else the connection dies after some timeout and the 
pool is unable to hand out a session.

The result of this is that the first request fails whenever the 
connection has been dropped.

Attached is a patch that allows supplying these pool-related 
configuration options directly in the ZCML directive (db:engine).

\malthe
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