Delete row sig_c51df8ec9f95 from signals

id sig_c51df8ec9f95
event_id evt_0542faf0a290
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-20T22:09:07.925060+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:b08543e324877055
throttle_s 0
created_at 2026-04-20T22:09:07.925060+00:00
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