[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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for table, column in [

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        ('transactions', 'tx_time'),

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        ('tx_entity_actions', 'tx_uuid'),

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        ('tx_relation_actions', 'tx_uuid')]:

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    repo.system_source.create_index(session, table, column)

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commit()