feat(jdbc-postgres): improve JDBC PostgreSQL queues queries performance #1883
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close #1121
These new indices has been tested on a table with 2.6 millions records in it.
The poll query goes from 1s to 1ms (on idle instance).
The execution of a DBT flow goes from 55s to 30s, of course this is just an example.
I think the previous indices didn't works because they didn't have the offset column, as all poll queries sort by offset or filter by offset; not having the offset column lead to the optimizer choosing a different index or no indices at all.
The new indices will take more space so I made them partial as they are only used when the consumer_* column is false.