Delete row sig_fe8edf59657f from signals

id sig_fe8edf59657f
event_id evt_75d707976371
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-14T17:14:06.531046+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:839773e42153a073
throttle_s 0
created_at 2026-04-14T17:14:06.531046+00:00
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