Delete row sig_259b75e8daa4 from signals

id sig_259b75e8daa4
event_id evt_3bf1c31a637d
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-08T21:10:27.452234+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:92338c33c45f47cc
throttle_s 0
created_at 2026-04-08T21:10:27.452234+00:00
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