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DROP FUNCTION timetravel();
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DROP FUNCTION set_timetravel(name, int4);
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CREATE FUNCTION timetravel()
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RETURNS opaque
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AS 'MODULE_PATHNAME'
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LANGUAGE 'C';
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CREATE FUNCTION set_timetravel(name, int4)
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RETURNS int4
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AS 'MODULE_PATHNAME'
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LANGUAGE 'C' WITH (isStrict);
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