Delete row sig_f781404c4517 from signals

id sig_f781404c4517
event_id evt_f25cd16476e6
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-11T16:31:43.212523+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:f7933787d8b32930
throttle_s 0
created_at 2026-04-11T16:31:43.212523+00:00
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