Delete row sig_4f78ab546116 from signals

id sig_4f78ab546116
event_id evt_63afae387021
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-07T16:37:18.233853+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:89f23fa286d22523
throttle_s 0
created_at 2026-04-07T16:37:18.233853+00:00
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