Delete row sig_18f3b1128947 from signals

id sig_18f3b1128947
event_id evt_161092f371b3
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-07T10:36:50.402886+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:9e4fe688b8f0523c
throttle_s 0
created_at 2026-04-07T10:36:50.402886+00:00
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