* fix: Avoid Snapshot violation
- Main thread created and "read" user
- Other thread modified something
- Main thread wants to delete or "write" to same row.
This violates snapshot isolation.
* fix: treat snapshot violation as deadlock for now
* test: handle snapshot violations
* feat: mysqlclient
* fix: update error attrs
* fix: decode mogrified query to unicode
* fix: do some cleanup
* chore: disable cleanup for now
* fix: remove unnecessary call to as_unicode
* test: skip perf test for now
* fix: fallback to empty str
* fix: unbuffered cursor support
* fix: update converters and other changes
* fix: add cleanup back
* perf: improve timedelta converter
* fix: dont attempt to run query when explain flag is set
* test: cleanup tests
* chore: remove commented code
* perf: store conf as local var
* chore: ensure sequence
---------
Co-authored-by: Ankush Menat <ankush@frappe.io>
