Improve reindex query

[jiqiang90]

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[stwiname]

Why not use sqlIterator there? It seems expensive to load before removing.

This maybe useful. Static destroy returns the number of items destroyed https://sequelize.org/api/v6/class/src/model.js~model#static-method-destroy

I see the same is happening with other data.

[jiqiang90]

sqlIterator apply sql to whole table, it is useful for sql like create index xxx for all records.

In batchDeletePoi, we only need to remove records with certain block ranges. Compare to sqlIteraor, even we add where conditions to excute the block range in sql, it will still iterate the complete table. I think this is the better approach.