Delete row sig_8514106e5e42 from signals

id sig_8514106e5e42
event_id evt_06c59881c790
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-19T22:00:21.828280+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:42f8f7f3cdeb15a7
throttle_s 0
created_at 2026-04-19T22:00:21.828280+00:00
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