Delete row sig_ffc770accbd4 from signals

id sig_ffc770accbd4
event_id evt_d80bf6876ff1
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-11T04:34:16.479930+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:ba939356e7b653cf
throttle_s 0
created_at 2026-04-11T04:34:16.479930+00:00
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