Implementation to enforce convenient write locks on Postgres and Sqlite #8004

Merged

rtibbles merged 2 commits intolearningequality:release-v0.14.xfrom apurva-modi:7891-db-lock-implementation

Apr 15, 2021

+173-17

Commits on Apr 14, 2021

created a simple context manager to implement database write lock using atomic transactions, for Sqlite created dummy operation to execute the task and for Postgres implemented advisory lock.
apurva-modi
committed

Commits on Apr 15, 2021

Fix tests
rtibbles
committed