netdata.conf for db size on a Docker container?

Is this the right file to alter the storage tiers?

Yes. But your syntax is wrong. Why did you add ** for time retention values? If you need only time-based (e.g. 1 week):

[db]
    mode = dbengine
    storage tiers = 1

    # Tier 0, per second data. Set to 0 for no limit.
    dbengine tier 0 retention size = 0
    dbengine tier 0 retention time = 7d

Just read the retention settings for details.

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