[server] Make connection pooler configurable and set better default values Drop the configuration connections-pool-size and add new configurations options: * connections-pool-min-size. Set to 0 by default so we open connections only when needed. This avoid opening min-size*processes connections at startup, which is, it think, a good default. * connections-pool-max-size. Set to 0 (unlimited) by default, so we move the bottleneck to postgresql. * connections-idle-timeout. Set to 10 minutes. I don't have arguments about this except that this is the default in pgbouncer.

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from os import unlink

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from os.path import isfile, join

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from cubicweb.cwconfig import CubicWebConfiguration as cwcfg

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regdir = cwcfg.instances_dir()

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if isfile(join(regdir, 'startorder')):

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    if confirm('The startorder file is not used anymore in Cubicweb 3.22. '

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               'Should I delete it?',

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               shell=False, pdb=False):

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        unlink(join(regdir, 'startorder'))

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