Delete row sig_1ff9eb1ebe8f from signals

id sig_1ff9eb1ebe8f
event_id evt_488a7c87d509
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-03T14:56:48.476543+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:63415f1fee0670ae
throttle_s 0
created_at 2026-04-03T14:56:48.476543+00:00
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