Delete row sig_a8c7b7568c63 from signals

id sig_a8c7b7568c63
event_id evt_53d79f3e04ea
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-20T23:24:18.334024+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:22e2844272d6c989
throttle_s 0
created_at 2026-04-20T23:24:18.334024+00:00
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