Delete row sig_b4ada3b75a3e from signals

id sig_b4ada3b75a3e
event_id evt_42537d5182e8
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-22T16:06:03.986496+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:93e8fc50ecc80251
throttle_s 0
created_at 2026-04-22T16:06:03.986496+00:00
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