Delete row sig_2559510e3bce from signals

id sig_2559510e3bce
event_id evt_04e5cefa51a4
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-12T05:36:09.283954+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:0da52e2e103e5b50
throttle_s 0
created_at 2026-04-12T05:36:09.283954+00:00
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