Delete row sig_1d739a55b4b5 from signals

id sig_1d739a55b4b5
event_id evt_896899352782
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-12T16:10:45.365086+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:10a63cf1ea071afd
throttle_s 0
created_at 2026-04-12T16:10:45.365086+00:00
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