Reindexing

In some cases, DipDup can't proceed with indexing without a full wipe. Several reasons trigger reindexing:

reason	description
`manual`	Reindexing triggered manually from callback with `ctx.reindex`.
`migration`	Applied migration requires reindexing. Check release notes before switching between major DipDup versions to be prepared.
`rollback`	Reorg message received from TzKT can not be processed.
`config_modified`	One of the index configs has been modified.
`schema_modified`	Database schema has been modified. Try to avoid manual schema modifications in favor of sql.

It is possible to configure desirable action on reindexing triggered by a specific reason.

action	description
`exception` (default)	Raise `ReindexingRequiredError` and quit with error code. The safest option since you can trigger reindexing accidentally, e.g., by a typo in config. Don't forget to set up the correct restart policy when using it with containers.
`wipe`	Drop the whole database and start indexing from scratch. Be careful with this option!
`ignore`	Ignore the event and continue indexing as usual. It can lead to unexpected side-effects up to data corruption; make sure you know what you are doing.

To configure actions for each reason, add the following section to the DipDup config:

advanced:
  reindex:
    manual: wipe
    migration: exception
    rollback: ignore
    config_modified: exception
    schema_modified: exception

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