Allowed Lateness
An engine that silently drops late records is not misbehaving. Keeping a window open to accept them costs state, which is why the default is to keep nothing.
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Stream Processing Semantics and Correctness
A streaming result describes data received by an agreed boundary. See how windows, lateness, state, and publication rules make revisions understandable.
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Database Ingestion and Change Data Capture
Build database copies with explicit snapshot boundaries, safe progress tracking, delete handling, and reconciliation.