Delete row sig_4615b06515b7 from signals

id sig_4615b06515b7
event_id evt_99da1d060515
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-03T17:05:58.549413+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:3e9b737de22e6652
throttle_s 0
created_at 2026-04-03T17:05:58.549413+00:00
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