Delete row sig_d8a4293928ff from signals

id sig_d8a4293928ff
event_id evt_a452447d8d24
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-14T23:13:21.369424+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:3c19b5ef4978b724
throttle_s 0
created_at 2026-04-14T23:13:21.369424+00:00
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