Delete row sig_64e321a0f8d7 from signals

id sig_64e321a0f8d7
event_id evt_ab6bf8d888e0
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-18T16:34:24.708778+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:e76657015ebd10f3
throttle_s 0
created_at 2026-04-18T16:34:24.708778+00:00
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