Awesome! To test, I run this a least once a day:
SELECT MAX(block_num) AS lastblock FROM sbds_core_blocks
And check against the head_block_number
here: https://api.steemjs.com/getDynamicGlobalProperties
I have fallen a bit behind a few times and as far as I can tell it's the public node we're connecting to that's the issue. Even so, stopping and restarting steem_sbds
should get you back on track eventually if you see you're falling behind.