Delete row sig_cd166cbdf72c from signals

id sig_cd166cbdf72c
event_id evt_19794e750301
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-11T18:52:06.127477+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:6167e752781aa66a
throttle_s 0
created_at 2026-04-11T18:52:06.127477+00:00
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