Delete row sig_8def139082e1 from signals

id sig_8def139082e1
event_id evt_5796ab2d9821
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-11T22:34:22.159662+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:8864a18f86cb4052
throttle_s 0
created_at 2026-04-11T22:34:22.159662+00:00
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