fix: add IsBlockComplete check to prevent gap detection race condition #79
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Add verification that a block is still incomplete in ClickHouse before calling ReprocessBlock in gap detection. This closes a TOCTOU race window where a block could complete (MarkBlockComplete writes complete=1 and cleans up Redis tracking) between when gap detection queries ClickHouse and when it decides to reprocess. Previously, gap detection only checked HasBlockTracking() which returns false after a block completes and Redis is cleaned up, causing already- complete blocks to be unnecessarily reprocessed. - Add IsBlockComplete() to state manager for fresh ClickHouse query - Add completion check in checkGaps() before ReprocessBlock call - Add unit test for race condition logic
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Add verification that a block is still incomplete in ClickHouse before calling ReprocessBlock in gap detection. This closes a TOCTOU race window where a block could complete (MarkBlockComplete writes complete=1 and cleans up Redis tracking) between when gap detection queries ClickHouse and when it decides to reprocess.
Previously, gap detection only checked HasBlockTracking() which returns false after a block completes and Redis is cleaned up, causing already- complete blocks to be unnecessarily reprocessed.