Delete row sig_5084009375b4 from signals

id sig_5084009375b4
event_id evt_610839a16803
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-10T20:50:26.702720+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:e60cbcdcd599f019
throttle_s 0
created_at 2026-04-10T20:50:26.702720+00:00
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