Keep event count to avoid duplicates and syncer fixes#458
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Processing an event twice could lead to accounting errors and miscalculations.
To prevent this, we introduce a table in the DB which keeps track of the block number and index of an event so the syncer won't process events if they have been processed already.
This simplifies the management of the syncer, and error handling with the web3 server, as we could always go safely re-fetch some blocks back in case of some disconnect.