[session] try to reconnect on unexpected error in system_sql. We need this for proper reconnection of pool used by hooks or looping task doing sql queries (such as cw_cleanup_transaction)

\.svn
^build$
^dist$
\.pyc$
\.pyo$
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\.old$
\~$
\#.*?\#$
\.swp$
^doc/book/en/apidoc$