Delete row sig_8264eec1ff8a from signals

id sig_8264eec1ff8a
event_id evt_08e3783a66fd
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-11T13:32:18.542860+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:426dd038a7b8cfd0
throttle_s 0
created_at 2026-04-11T13:32:18.542860+00:00
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