Delete row sig_12b413665011 from signals

id sig_12b413665011
event_id evt_91b60573ea7c
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-09T09:02:11.265632+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:751fce94cc73049d
throttle_s 0
created_at 2026-04-09T09:02:11.265632+00:00
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