Retry on concurrency issue(s)

[pydanny]

Using the patch pattern from fastai, but without the patch decorator. Wraps the db.execute() method to retry on what are probably concurrency issues (need to confirm with new load tests)

Challenge: Unfortunately

            # Catch the unfortunately generic error sqlite3.OperationalError
            # to determine if this is a concurrency issue
            if "cannot start a transaction within a transaction" in str(e).lower():
                # Probably a concurrency issue, retry
                # We could make this more precise with time.perf_counter but
                # imprecision here is a good thing as it adds jitter
                # Yes, this avoids exponential backoff for REASONS
                time.sleep(0.001)
                continue
            # Since this isn't a transaction failure, we re-raise the issue so
            # other logic in this library can handle it