Delete row sig_a1fefe2b1ba1 from signals

id sig_a1fefe2b1ba1
event_id evt_d912889ebdf2
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-18T11:07:26.130327+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:15ca2c9a849a88cc
throttle_s 0
created_at 2026-04-18T11:07:26.130327+00:00
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