Delete row sig_93e30be43e43 from signals

id sig_93e30be43e43
event_id evt_c5f467c9517f
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-13T14:49:28.013802+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:9dda8e3c681dc7c4
throttle_s 0
created_at 2026-04-13T14:49:28.013802+00:00
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