* fix(postgres): add rollback to prevent crash on hash collision
* fix(postgres): rollback to savepoint to prevent crash on hash collision
* fix(postgres): tighten bounds for a rollback to savepoint for a better perf
* fix(postgres): Handle hash collision efficiently with ON CONFLICT
* refactor: better naming
- Private methods
- "rows" is not a correct name for single record's name
* fix: Bad error handling
- Why raise postgres error?
- Let default error raising/handling happen
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Co-authored-by: Ankush Menat <ankush@frappe.io>
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