Delete row sig_adad4cfa11ab from signals

id sig_adad4cfa11ab
event_id evt_37584154274b
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-11T06:54:27.407945+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:c6dd6b0f4d8e9a69
throttle_s 0
created_at 2026-04-11T06:54:27.407945+00:00
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