blockchain: Remove main chain index from db. #1334
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alexlyp
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This removes the main chain index from the database as well as all code related to reading and writing it (other than those in the upgrade paths) since it is no longer used and bumps the database version since it is not possible to downgrade after the main chain index has been removed.
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NOTE: It is not possible to downgrade after running this PR. If you plan to test it, please make a copy of your data directory first.
This PR requires #1332.
This removes the main chain index from the database as well as all code related to reading and writing it (other than those in the upgrade paths) since it is no longer used and bumps the database version since it is not possible to downgrade after the main chain index has been removed.
Testing Notes
As of this PR, the expected behavior is that there is a single migration that takes a couple of seconds to complete after which it will no longer be possible to downgrade.
As the warning above notes, if you try to run an older software version after this migration has completed, you will get an error message similar to
Unable to start server on [:9108]: the current blockchain database is no longer compatible with this version of the software (4 > 3).This is work towards #1145.