[massive store] Lazy removal of constraints and metadata indexes They should not be removed during store's init, because we may want to query the database with its index between store creation and call to prepare_insert* (e.g. to build the extid2eid map). Along the way: * rename drop_metadata_constraints into drop_metadata_indexes, because that's what it does * rework a bit impacted tests Closes #15538359

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Tutorials

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We present a few tutorials of different levels. The blog building

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tutorial introduces one smoothly to the basic concepts.

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Then there is a photo gallery construction tutorial which highlights

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more advanced concepts such as unit tests, security settings,

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migration scripts.

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.. toctree::

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   :maxdepth: 1

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   base/index

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   advanced/index

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   tools/windmill.rst

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   textreports/index

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   dataimport/index