Delete row sig_4a1f2ec87b91 from signals

id sig_4a1f2ec87b91
event_id evt_793c1a20a21b
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-17T07:28:40.222052+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:6b3bd4c0fdd665ad
throttle_s 0
created_at 2026-04-17T07:28:40.222052+00:00
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