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Users can now (optionally) set a target chunk size and TimescaleDB
will try to adapt the interval length of the first open ("time")
dimension in order to reach that target chunk size. If a hypertable
has more than one open dimension, only the first one will have a
dynamically adapting interval.
Users can optionally specify their own function that calculates the
new dimension interval. They can also set a target size of 0 in order
to estimate a suitable target size for a chunk based on available
memory.