[dataimport] massive_store: drop all constraints in __init__ and restore all in finish
This should avoid dependency issues when dropping specific constraints (e.g.
when dropping a primary constraint referenced by a foreign key constraint).
We only do this in master mode, slave mode stores are supposed to work
with an initialized db already.
[MESSAGES CONTROL]
disable-msg = C0301
[VARIABLES]
# Enable / disable this checker
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additional-builtins = _, display_name
[BASIC]
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[TYPECHECK]
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