* Revert "Fix parent record locks usage in child banks (#4159)" This reverts commit 69eeb7cf08c645971685632931da252e3eb0cc4f. * Revert "Fix DuplicateSignatures caused by races on frozen banks (#3819)" This reverts commit 083090817adfbf887ece2213df59cc7a1e4c84d5. * Remove unused imports