Delete row sig_d79140712359 from signals

id sig_d79140712359
event_id evt_35f14840d029
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-12T22:11:38.523806+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:d2194bfed2bed8db
throttle_s 0
created_at 2026-04-12T22:11:38.523806+00:00
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