Delete row sig_42116db3eb97 from signals

id sig_42116db3eb97
event_id evt_ecdbf74e51a7
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-16T07:35:09.585038+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:46f9f18f16bbd963
throttle_s 0
created_at 2026-04-16T07:35:09.585038+00:00
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