Delete row sig_8948678b4671 from signals

id sig_8948678b4671
event_id evt_5ff5b8743a3a
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-18T18:41:56.043230+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:28b3e4e318d9ec9f
throttle_s 0
created_at 2026-04-18T18:41:56.043230+00:00
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