Delete row sig_cf21697749f0 from signals

id sig_cf21697749f0
event_id evt_d9d9a55391bf
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-19T07:30:59.711865+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:de15c339b29fc092
throttle_s 0
created_at 2026-04-19T07:30:59.711865+00:00
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