Constant CONTINUOUS_TABLE_CHANNEL_CAPACITY 

pub const CONTINUOUS_TABLE_CHANNEL_CAPACITY: usize = 64;

Default per-continuous-table channel capacity. Bounds the in-memory queue between a producer and the DataFusion consumer: a slow consumer (e.g. an expensive join downstream) cannot cause an unbounded producer to grow memory without limit. 64 batches × ~1k rows/batch ≈ 64k rows of inflight buffering, which is enough to absorb short stalls without imposing visible backpressure on typical CDC / streaming-SQL workloads.