Delete row sig_21b968aa4e1e from signals

id sig_21b968aa4e1e
event_id evt_ca99386208b1
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-19T19:30:12.715374+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:58c087661b16e649
throttle_s 0
created_at 2026-04-19T19:30:12.715374+00:00
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