extremely large database size when sync attempts are made but don’t complete

[lyw07]

Observed behavior

Reported by a user:

When sync attempts are made but don’t complete, the table morango_buffer in the database took 8.2 GB.

Expected behavior

According to Blaine, the table morango_buffer should be automatically cleared at the end of the sync

User-facing consequences

Users have an extremely large database

Errors and logs

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Steps to reproduce

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Context

Kolibri version: 0.14.0b8