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Please check out this thread: https://apachedruidworkspace.slack.com/archives/C0309C9L90D/p1675782972380179

There is a

sql

input source in native batch ingestion, which supports ingestion from the

postgres

database. You can use that to ingest the data from the existing postgres database to druid. More info can be found here: https://druid.apache.org/docs/latest/ingestion/native-batch-input-sources.html#sql-input-source.