Delete row sig_4020944dc116 from signals

id sig_4020944dc116
event_id evt_e696f8746536
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-20T05:07:19.751878+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:8443a0e17b2180d0
throttle_s 0
created_at 2026-04-20T05:07:19.751878+00:00
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