Delete row sig_fad54f187e59 from signals

id sig_fad54f187e59
event_id evt_d5152ec3eb62
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-17T22:34:12.185678+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:d6d70e9a2ac64bfd
throttle_s 0
created_at 2026-04-17T22:34:12.185678+00:00
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