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DynamoDB Streams API can only convey a single parent per stream shard. Tablet merges produce 2 parents, which is incompatible. When streams are requested on a tablet table, block tablet merges via tablet_merge_blocked (the allocator suppresses new merge decisions and revokes any active merge decision). add_stream_options() sets tablet_merge_blocked=true alongside enabled=true, so CreateTable needs no special handling — the flag is inert on vnode tables and immediately effective on tablet tables. For UpdateTable, CDC enablement is deferred: store the user's intent via enable_requested, and let the topology coordinator finalize enablement once no in-progress merges remain. A new helper, defer_enabling_streams_block_tablet_merges(), amends the CDC options to this deferred state. Disabling streams clears all flags, immediately re-allowing merges. The tablet allocator accesses the merge-blocked flag through a schema::tablet_merges_forbidden() accessor rather than reaching into CDC options directly. Mark test_parent_children_merge as xfail and remove downward (merge) steps from tablet_multipliers in test_parent_filtering and test_get_records_with_alternating_tablets_count.