Delete row sig_fe5b18e78efb from signals

id sig_fe5b18e78efb
event_id evt_7381639edcfb
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-18T11:37:43.293527+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:47f92a5a8d5977e5
throttle_s 0
created_at 2026-04-18T11:37:43.293527+00:00
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