Delete row sig_5831c11803f4 from signals

id sig_5831c11803f4
event_id evt_1cf56a705a4d
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-19T09:39:47.920503+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:3f3b0ab99476ade0
throttle_s 0
created_at 2026-04-19T09:39:47.920503+00:00
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