Delete row sig_ab28d5ed9f89 from signals

id sig_ab28d5ed9f89
event_id evt_da82e0282d4f
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-11T14:22:51.809944+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:751a31bc645d599a
throttle_s 0
created_at 2026-04-11T14:22:51.809944+00:00
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