To increase schema security we do not want to mix our own internal
objects with user objects. Since chunks are created in the
_timescaledb_internal schema our internal functions should live in
a different dedicated schema. This patch make the necessary
adjustments for the following functions:
- to_unix_microseconds(timestamptz)
- to_timestamp(bigint)
- to_timestamp_without_timezone(bigint)
- to_date(bigint)
- to_interval(bigint)
- interval_to_usec(interval)
- time_to_internal(anyelement)
- subtract_integer_from_now(regclass, bigint)
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