Query validation SQL shouldn't use own materialized tables

[shangyian]

Summary

When building SQL for query validation, it should not use its own materialized tables (i.e., the availability state). This PR achieves that by making the SQL builder use the default build criteria that contains the target node name.

This also adds an additional feature to kick off a background task that rebuilds and updates the SQL in the queryrequest table after each SQL request, so that subsequen requests will get the most up-to-date SQL.

Test Plan

• [ ] PR has an associated issue: #
• [ ] make check passes
• [ ] make test shows 100% unit test coverage

Deployment Plan

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