Delete row sig_9dcab0b7dbaa from signals

id sig_9dcab0b7dbaa
event_id evt_f242d7a0d5b4
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-18T06:00:38.954637+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:6ef1b36755172c0f
throttle_s 0
created_at 2026-04-18T06:00:38.954637+00:00
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