Delete row sig_18aca3756c40 from signals

id sig_18aca3756c40
event_id evt_3afc70430a48
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-20T05:39:24.600288+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:0d662f7833837f5c
throttle_s 0
created_at 2026-04-20T05:39:24.600288+00:00
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