Delete row sig_4d38ac8da953 from signals

id sig_4d38ac8da953
event_id evt_beab835433bc
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-08T12:48:20.694209+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:c81d57dc1559aa62
throttle_s 0
created_at 2026-04-08T12:48:20.694209+00:00
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