Delete row sig_b519d7e629ae from signals

id sig_b519d7e629ae
event_id evt_7523e334d0ca
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-20T04:02:37.320729+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:d5cded7b4ff5ddcd
throttle_s 0
created_at 2026-04-20T04:02:37.320729+00:00
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